Sierra Norte Research Articles

Desarrollo de un sistema y de un proceso como un medio para lograr la repetibilidad de resultados en la fermentación de café de baja altura

This article takes as a case study coffee grown by micro and small producers at altitudes below 1000 m a.s.l., in this scenario there is a problem during the fermentation stage. Artisanal fermentation is uncertain and does not achieve repeatability of results, therefore, the quality of the coffee cannot be guaranteed. The objective of the present work is to contribute to the solution of this problem by using technology and the implementation of processes that lead to the consistency of the results during fermentation. The technology will be used to register and control fermentation parameters such as temperature, pressure, among others. The processes will control activities such as cherry selection, product and components handling during the fermentation stage. The proposed solution will be implemented in the XaTiwan organization, a small coffee producer in the Sierra Norte of the State of Puebla. This article includes the early phases of the development cycle of a cloud-based software system to automate the fermentation process with which it seeks to achieve repeatability of results at this stage. This will contribute to control the quality of coffee grown in low altitude areas.

Riqueza, diversidad, endemismo y determinantes ambientales de <i>Pinus</i> L. en Oaxaca, México

Background: Oaxaca is a Mexican region with a high richness of pine trees. However, the specific location where it occurs and the influence of the environment on it is deficient. Questions: Where the greatest richness, diversity and endemism of Pinus species is located in Oaxaca? How does the environment influence the richness, diversity, and endemism of Pinus species in Oaxaca? Studied species: Pinus ayacahuite, Pinus chiapensis, Pinus devoniana, Pinus douglasiana, Pinus hartwegii, Pinus herrerae, Pinus lawsonii, Pinus leiophylla, Pinus maximinoi, Pinus montezumae, Pinus oocarpa, Pinus patula, Pinus pringlei, Pinus pseudostrobus, Pinus tecunumanii and Pinus teocote. Study site: Oaxaca Methods: Occurrences of pine species were collected. From these, spatial cells were delimited, and species and environmental matrices were constructed, with which canonical correspondence analysis was carried out. The richness, diversity, and endemism of pines per cell was calculated, correlating them with physical-environmental parameters. Results: 15 cells with high richness and 17 with high endemism were identified, located in the Sierra Sur, Sierra Norte and La Mixteca regions. Richness, diversity, and endemism were negatively influenced by temperature and compaction soil (r = -0.48, P < 0.01) and positively by topographic (r = 0.43, P < 0.01) and soil parameters (r = 0.45, P < 0.01). Conclusions: The Sierra Norte, Sierra Sur and La Mixteca contain the greatest richness and endemism of pine species in Oaxaca. Richness is positively and negatively related to topographic and temperature variables, respectively.

The rarest of rarities in the flora of Mexico

Background: Endemism can originate from multiple biogeographic and evolutionary processes that promote the formation or persistence of species with restricted distributions (rare species). Understanding rare species’ distributions is a central question in biogeography and is crucial for biodiversity conservation. Questions: What are the rarest plant species in Mexico? How are they distributed? Under what risk categories should they be classified? Studied species: Vascular species considered rare in the flora of Mexico. Study site: Mexico. Methods: “Rare species” were defined as species endemic to Mexico whose distribution is restricted to a single 1 × 1° cell. We analyzed rare species’ distributions and proposed the risk category for each according to IUCN criteria. For some of the species distributed in the cell with the highest number of rare species, we compared the proposed category with published evaluations. Results: We identified 2,705 rare species. The richest cells in terms of rare species are in southern Mexico. Only 302 species had been previously evaluated under IUCN criteria. The remaining 2,403 qualify for the Near Threatened (NT) category or higher. The cell with the highest rare species richness, located in the Sierra Norte of Oaxaca, contained only 10 species with an existing IUCN risk category; for another 81 species, the categories of Vulnerable (VU), Endangered (EN) or Critically Endangered (CR) are indicated. Conclusions: Recognizing the rarity of these 2,705 species will increase attention on them, allowing more precise appraisal of their extinction risk and possible strategies for their conservation.

Giving Birth in the Mountains: Plants and Practices in Reproductive Health of Zapotec Women in Northern Oaxaca

Midwives/healers assist women in rural communities in Mexico and use medicinal plants to relieve different conditions related to reproductive health. This knowledge has been passed down and preserved through generations. The aims of the study were: 1) to document the floristic richness of medicinal plants used in the reproductive health of Zapotec women from the Sierra Norte of Oaxaca; 2) to document events, stages, and conditions during reproductive health; and 3) to provide evidence on the continuity of midwifery practices in the region. We interviewed 100 Zapotec women, 11 midwives/healers, the municipal authorities of four municipalities: Tabaá, Yojovi, Solaga, and Analco, and personnel from each health center. We recorded 66 plant species, with cinnamon, avocado, and rue the most mentioned. Asteraceae, Lamiaceae, Poaceae and Fabaceae were the most abundant. We identified five events with different stages/conditions during the reproductive health of women. The number of species mentioned by Analco collaborators differed by age category, indicating a breakdown in traditional knowledge. Multivariate analysis comparing the knowledge of native and introduced species between the collaborators of four municipalities revealed that they were clustered because of the mention of some introduced species (Analco) or because some species were mentioned once (Laxopa). However, the same analysis using native species shows no grouping, suggesting that women share similar knowledge. Traditional midwifery practices and medicinal plants used during the reproductive stage of Zapotec women are still based on native Mexican plants, and their persistent use will depend on the context of each locality and the global medicine system.

PERCEPTION OF LOCAL DEVELOPMENT AND TOURISM IN THE VISION OF STAKEHOLDERS IN THE WESTERN SIERRA MORENA (ANDALUSIA, SPAIN)

Rural spaces take into account the multifunctionality of uses and economic diversification as adaptive strategies for development, while becoming areas for new socio-economic activities. Tourism is regarded as a tool for generating local development processes in this context. The goal of this study is to investigate the local development processes triggered by tourist activity in the three westernmost Nature Parks of Sierra Morena: Sierra de Aracena and Picos de Aroche (Huelva), Sierra Norte de Sevilla (Seville) and Sierra de Hornachuelos (Cordoba). A mixed methodology was applied: (1) conducting interviews with stakeholders so as to ascertain the perception of those who participate in the development processes or influence them; (2) using secondary data to evaluate the impact of tourism on local development. The results of the work indicate that: (1) turning the areas into Nature Parks has repercussions on the tourist supply and demand; (2) the economic dimension of tourism in local development is prevalent in the dominant discourse, while expectations are not found; (3) socio-cultural impacts on the community are barely perceived by stakeholders, with few positive impacts of tourism on the local community; (4) the environmental dimension is regarded as a personal, rather than a collective matter, underestimating environmental impacts; (5) tourism development in the different municipalities and Nature Parks is irregular. In conclusion, the effect of tourism on local development processes in the study area is limited, although there are differences between municipalities and Nature Parks.

Funciones alométricas de altura total para pinos tropicales en Puebla, México

Tropical pines are important because of the amount of wood they produce in short periods. However, it requires allometric functions to predict the total tree height, since it is one of the critical variables to estimate both, it is the total and commercial volume. Accordingly, we aimed to develop a local and a generalized allometric function for model the total height-diameter (h-d) relationship of Pinus caribaea var. hondurensis and hybrid Pinus caribaea var. hondurensis × Pinus tecunumanii in the Sierra Norte of Puebla, México. In order to analyze the relationships, 1 232 h-d pairs were used. The allometric models were fitted with three parameters totaling 80% of the data and validated with 20%. The best model had the lowest average bias, root mean square error, and Akaike’s Information Criterion, as well as of the highest adjusted coefficient of determination. The models explained over 58.55% of the variability in observed total tree height. Nonetheless, the Gompertz and Weibull models obtained the best performances in fit and validation, and estimated h of tropical pines with less uncertainty. In consequence, the fitted allometric functions are reliable for predicting tree h; therefore, it can contribute to the sustainable management of commercial tropical pine plantations in the study region.

The pristine precursor of Andean-type magmatism preserved in magma mingling zones

Intermediate magma compositions have been postulated to be parental to Andean-type magmatism in the recent years. Geochemical and experimental methods have allowed the modelling of a hypothetical parental composition that accounts for the major element trends displayed by Andean-type batholiths. However, natural plutonic examples matching the modelled composition remain lacking, likely due to the predominance of fractionated liquids and cumulates in the batholiths after protracted and large-scale differentiation. Contrary to this, magma mingling zones, a common feature in Andean-type batholiths, are characterised by quenching phenomena, minimising differentiation. In this paper, we present data from intermediate magmatism in the world-class Gerena magma mingling zone in the Seville Sierra Norte batholith (southern Iberia), compositionally equivalent to Andean-type magmatic series. Geochemical data from quenched dark globules of variable scale and the corresponding host granodiorites are contrasted with the bimodal trends displayed by the host batholith. Results suggest that the smaller-scale dark globules have not undergone any significant fractionation. Furthermore, after conducting geochemical modelling we conclude the dark globules represent a composition that could be parental to Andean-type magmas. We propose that magma mingling zones are an optimal place to probe for parental magmas of Andean-type magmatism, particularly those represented in pristine melanocratic, intermediate globules.

Adaptive anti-predatory responses of European rabbits exposed to different predation pressure

Prey species develop anti-predatory strategies as a response to minimising the risk of being predated. However, how the European rabbit (Oryctolagus cuniculus) adapts to different predator pressure is not fully known. Here, we studied the adaptive anti-predatory responses of European rabbits exposed to different terrestrial predation pressure. To do this, we took advantage of a rabbit translocation programme in the Sierra Norte Natural Park of Sevilla (SW Spain), where rabbits from the same donor population were translocated in plots with and without terrestrial predator exclusion fences (aerial predation was not excluded in any of the plots). This presented an ideal opportunity to observe whether the behaviour of individuals from the same population adapts to situations with different predator pressure; thus, their behaviour was evaluated through direct observations. Although most rabbits were observed close to cover, differences in distance to cover, group size and behaviour were observed between fenced and unfenced plots. Overall, both adult and juvenile rabbits moved further from cover in the unfenced plot than in the fenced plot. Most of the observations in the unfenced plot corresponded to rabbits in pairs or alone; whereas in the fenced plot, rabbits were primarily in pairs or in larger groups. Our findings suggest that in the unfenced plot, rabbits that moved further from cover were often part of larger groups (≥ 4 rabbits); whereas in the fenced plot, it was rabbits in smaller groups (< 4 rabbits). Rabbits in the unfenced plot were alert and running more frequently than rabbits in the fenced one; in the latter, these rabbits were mostly feeding. Other relaxed behaviours such us grooming or resting were more frequent close to cover. In summary, our results highlight rabbits' capacity to promptly adjust behaviour in response to predation risk, exhibiting adaptive anti-predatory responses tailored to different predation pressures. These insights contribute to understanding the nuanced dynamics of prey species' responses to diverse predation scenarios.

Turismo Rural Comunitario en La Sierra Norte de Oaxaca (México). Una mirada en tiempos de pandemia

This work focuses on Rural Community Tourism (CRT) in the Sierra Norte de Oaxaca, Mexico. From secondary sources, a conceptual approach is made, to go on to analyze the characteristics of this form of tourism, its strengths and weaknesses, as well as the reflective opportunity offered by the pandemic caused by COVID-19. Finally, an evaluation of its achievements is carried out based on three groups of aspects: the influence of the CRT in the economies of the inhabitants, the relations between tourists and the native material and immaterial heritage and culture, and the dynamics of business management, patrimonial and identity of the settlers with respect to the CRT. The conclusions show a positive evaluation about the three aforementioned areas, although with various limitations and tensions. At the same time, they highlight the opportunities that this type of tourism raises for the new normal that is presumed in the future.

Ritual Use of Ceratozamia totonacorum (Zamiaceae) Leaves in Santiago Ecatlán, Puebla, Mexico: Perspectives on Conservation

This study focused on the use and management of Ceratozamia totonacorum leaves during the Day of the Dead in Santiago Ecatlán, an Indigenous Totonaca community located in the Sierra Norte of Puebla, Mexico. Ethnographical, ethnobotanical, and ecological methods were utilized to document the ritual use and traditional management practices of C. totonacorum. Additionally, this information was used to evaluate the impact and effect of leaf extraction on a C. totonacorum population. C. totonacorum plants grow on limestone cliffs and in adjacent agricultural fields. Experienced harvesters remove the leaves without damaging the plants, and when C. totonacorum leaves become scarce they are substituted by Chamaedorea spp. Our results show that these practices do not have a negative impact on the studied population. We conclude that community management practices have contributed to maintaining a stable population of C. totonacorum. We therefore consider the need to study the relationship between the permanence of ritual ceremonies and associated sustainable plant practices and the importance of projects based on a better understanding of ritual plant uses, which could contribute to sustainable resource and ecosystem conservation. This research demonstrates the relevance of co-designing comprehensive conservation strategies that vindicate the value and promote local expressions of traditional knowledge.

Contrasting patterns of land-cover change between early and late successional forests in a tropical montane cloud forest area managed under the milpa system

Land cover dynamics (LCD) in areas affected by different management types are hard to predict. Such is the case of tropical montane cloud forest (TMCF) areas in Mexico. The millenary itinerant milpa involves local cyclical deforestation and natural reforestation dynamics with long-lasting fallow periods. Conversely, induced grasslands for cattle, non-traditional maize cultivation with short fallow periods, and sedentary agriculture involve persistent deforestation rates. Also, human density changes could alter LCD. Ignoring such factors may lead to equivocal conclusions. We analyzed LCD using remote sensing analyses with LANDSAT images during two periods (1993–2005, 2005–2014) in a TMCF area in Sierra Norte, Oaxaca, affected by milpas, sedentary agriculture, and grasslands. We divided the study area into six indigenous sub-regions with different human population growth rates (HPG). We identified five land-cover types: mature forests (MF) dominated by TMCF species, early successional pine forests (PF), shrubby fallows (SH), croplands (milpas and more sedentary maize croplands together), and grasslands. We show that: (a) The 1993–2005 period was more variable than the 2005–2014 period, 27 % vs. 21 % of the total area displayed transitions into another class. (b) MF area dominated (277,128 ha), increased from 1993 (64.0 %) to 2014 (67.6 %), and was not statistically associated with HPG. (c) PFs decreased from 27 % in 1993 to 15 % in 2014, and their rate of change was negatively associated with HPG. (d) The total forest area (MF + PF) decreased by 9.3 %. (f) Grasslands, SHs, and croplands fluctuated between periods and sub-regions, but none exceeded 7 % of the total area. (g) Grasslands showed the greatest increase rate, mainly at the expense of forestlands. (h) The grassland and SH increments were positively associated with HPG. The heterogeneity in LCD among periods and sub-regions reveals the relevance of considering temporal and spatial scales within the same region. The persistence of MF and the PF decrease can be ascribed to the disruption of the successional dynamics related to the decline of the traditional milpa enforced by federal and state policies at the beginning of the 21st century, the sedentarization of agriculture, local conservation areas, increases of induced pastures, and human emigration. Although Sierra Norte is an essential reservoir of TMCFs, the decline of the total forest area, particularly secondary forests, is of concern given their roles in resilience and as carbon, culture, and biodiversity reservoirs. Humid mid-elevation areas of Sierra Norte are one of the few examples of mature forest persistence and secondary forest decline.

Use of firewood in an indigenous community from the Sierra Norte de Puebla: a gender perspective on the access to natural resources

Objective: To analyze several key elements in order to understand the rights of use, access, and ownership of natural resources, based on the social roles assigned to each gender in the community of Reyeshogpan, Puebla, Mexico. Design/Methodology/Approach: A participant observation methodology was used, complemented by the application of 24 semi-structured interviews in local households. Results: The surface ranges of the plots are 0.25 ± 3.0 ha. Out of all the interviewees, 40.79% own less than 0.5 ha, which is not enough to cover their annual energy needs (10,752 m3 per household). Therefore, they rent and loan their land, as well as purchase of firewood. Regarding the access to land category, 82.14% is owned by men and 17.86% by women. However, this percentage of female holders does not imply that they can exercise their rights as owners, because the land is generally administered by men. This situation confirms that the access to land influences the availability of firewood and its energy use. Study Limitations/Implications: The information provided by the interviewees was the basis for the analysis of the use and amount of firewood used by households; however, the interviewees may have underestimated or overestimated the amounts. Findings/Conclusions: In the Reyeshogpan community, the gathering of firewood is carried out according to gender, based on the physical differences between men and women. Tasks specifically assigned to men are related to their physical strength, while the tasks performed by women are considered complementary and are not given any economic value.

A new species of Dilophochila Bates, 1888 with comments on natural history and distribution of the genus (Coleoptera: Melolonthidae: Rutelinae)

A new species, Dilophochila glabra sp. nov. is described from the Sierra Norte, Oaxaca, Mexico. Diagnosis and images (dorsal, lateral and ventral habitus, and genitalia) of the taxonomic characters are provided. Affinities with their closest congeners and the general distribution pattern of the genus are discussed, considering that it presents a typical Mountain Paleoamerican sub-pattern. The modifications in the mouthparts of this genus due to the specialization in the intake of pine needles are commented, as well as in two other different taxa within Anomalini.

Tourist Perceptions of Climate Change Impacts on Mountain Ecotourism in Southern Mexico

Climate change impacts on tourism are well documented, with most studies focusing on challenges facing ski or beach tourism. While non-ski, mountain tourism accounts for almost one fifth of tourism worldwide, there is a dearth of research on tourists’ perceptions of climate change impacts and their effects on tourism demand in these areas. This study, conducted at the ecotourism destination of the Pueblos Mancomunados in the Sierra Norte Mountains of southern Mexico, helps to fill that gap by identifying important tourist decision factors and determining how tourists’ decisions to visit may change under different climatic conditions. Using on-site intercept survey research methodology involving 188 tourists, we found that some climate change scenarios affect tourists’ perceptions of the desirability of visiting nature-based tourism sites. Results indicate that community-based ecotourism businesses, such as the one that operates in the Pueblos Mancomunados, need to specifically plan for climate change impacts, as they may need to alter tourism offerings to sustain demand.

Development of a blueberry sorting machine

In the municipality of Zacatlan de las Manzanas located in the Sierra Norte of the State of Puebla, many families are dedicated to grow blueberry, basically at the time of cutting the fruit or harvesting the area is accessed with baskets for collection, then begins the process that focuses on the selection of the fruit by size, this task is very late and therefore tedious especially if it is done without using tools, on the other hand should take care of the handling of the fruit to be kept in optimal conditions. The objective of this article is the development of a blueberry sorting machine from the design of a mechanical-electrical system using CAD software and simulation, to its operation to ensure the correct selection, better handling of the fruit and reduce time and movements, in order to improve the process and scheduled delivery to the customer. With this project it is intended that the blueberry sorting machine has advantages over the manual selection of the fruit in the size classification by means of a simple system for this process.

Humanistic geography in an indigenous community of Mexico: Santa Catarina Lachatao

IntroductionThe present study aim was to rethink the geographical reasoning of everyday life toward a new understanding of knowing how to think about space through an interdisciplinary approach, architecture-psychology. This allowed establishing logical relations in spatial and socio-spatial distributions and uses of social phenomena, typical of Santa Catarina Lachatao, an indigenous Mexican community in Sierra Norte Zapoteca.MethodsBased on ethnographic qualitative interdisciplinary research methods along with a total of three visits lasting 15 weeks, the daily experience of people and their community in different times and spaces, experiences, perspectives, and prejudices, were studied. The geographical approach (cartographies) reflects the social construction of the spatial components as the basic understanding of the territory from everyday life. In this study we worked on indigenous citizenship and its territory, analyzing, and contrasting social phenomena such as power-subjection, wealth-poverty, and exclusion-inclusion that transversally allow us to reflect and understand some of the characteristics of diversity and territoriality of the indigenous communities in Mexico.ResultsCharacteristics that predominating in indigenous communities was recognized and featured. This was observed in the social production of their public space which evidence intergenerational pride and sense of community and belonging and their commitment to preserve their life project sustaining their space, community, and traditions. The natural rural context emerges from the interplay between the natural landscape and the built environment (in constant expansion). The bodies of water are respected and protected by the community and the original crossings are still preserved as precious resources, just as any other natural element. Landscape takes precedence over the irregular built environment, reflected in the urban trace.DiscussionDeveloping interdisciplinary research -architecture and psychology–allowed studying the community development of a Mexican indigenous community, respectfully approaching diversity and territoriality of Santa Catarina Lachatao, Oaxaca. Societies must be understood in and by means of space. Public policy is crucial to strengthen the autonomy and configuration of indigenous communities, warranting their active participation in the design and evaluation of government programs that favor the sustainable use of their lands and natural resources, as well as the preservation of their values and traditions. The principles of justice are chosen behind a veil of ignorance. John Rawls

Tree canopy patterns in a temperate forest in Oaxaca, Mexico after bark beetle outbreaks: Implications for ecological resistance and resilience

Bark beetles (BB) are an insect that can become a forest pest and that principally affects temperate regions globally, massively killing tree hosts, mainly coniferous species. When tree hosts are the dominant species in the canopy, BB outbreaks may impose important changes in the structure, composition and diversity of forests, from the stand to the regional scale. In Mexico, during the current century, BB pests have become the main biotic threat in forests where Pinus species are dominant. Questions addressed in this study are: What is the structure, composition and diversity of the forest canopy after BB disturbances? and “What are the implications for ecological resistance and resilience of the forest”? The study site was located in the Sierra Norte region in Oaxaca, Mexico, where more a decade ago BB outbreaks affected the forest. In ninety plots of 500 m2 (4.5 ha) all live trees with ≥ 5 cm diameter at breast height (DBH) were located, their DBH was measured, and the species was identified. As well, all stumps resulting from previous sanitation logging and timber extraction (TE) were located and for each condition, basal diameter was estimated and the genera identified. For the post-disturbance canopy, density basal area, species composition and diversity (alpha and beta) were estimated. This data plus the analysis of the stumps was used to estimate the tree canopy structure before the BB outbreaks. Statistical comparisons among BB, TE disturbances and condition without disturbance were conducted. Based on interviews with local experts, a rank of risk to BB among Pinus species was established. A total of 4,053 live trees and 547 stumps were found. The live trees corresponded to 24 species from 8 genera. Pinus genus and, particularly P. patula predominated. Seventy-five percent of the individuals had < 20 cm DBH and a J-inverted diametric distribution resulted. Individuals with DBH ≥ 100 cm were found only in the condition without disturbance. Three of the nine Pinus species, were BB main-host species, and the least preferred host was P. ayacahuite. The three BB main-host species dominated the post-disturbance canopy (including regeneration). In contrast, P. ayacahuite and other non-host tree species dominated in the conditions without disturbance, and the three main-host species showed low density. As well, high species richness occurred in areas affected by BB. Since climate change will likely continue to exacerbate BB outbreaks, it is proposed that to increase ecological resistance and resilience forest management practices should focus on reducing density, promoting a mix of host and non-host species, increasing tree diversity and avoiding stands with monodominance of main-host species.

Zamia magnifica (Zamiaceae, Cycadales): A New Rupicolous Cycad Species from Sierra Norte, Oaxaca, Mexico

Zamia magnifica (Zamiaceae), a new species endemic to Sierra Norte, Oaxaca, Mexico, is described. Zamia magnifica is characterized by having a rupicolous habit, pendent leaves bearing leaflets that are densely tomentose and pink to caramel in color when emerging, and broad oblong leaflets that are coriaceous in texture with few non-prominent denticulations and ovulate strobili with short (&lt;4 cm) peduncles. It is compared to Z. furfuracea and Z. meermanii, the Mesoamerican Zamia species to which it shares the closest morphological resemblance.

The Effects of Tourism on Local Development in Protected Nature Areas: The Case of Three Nature Parks of the Sierra Morena (Andalusia, Spain)

In rural spaces, new activities are developed to add to the traditional ones in the context of multifunctionality, considering the protection and enhancement of natural and cultural heritage, as in natural parks. These incorporate new recreational and tourist functions, understood as an instrument for local development. This research aims to study the relationships between tourism and local development in three natural parks (Sierra de Aracena and Picos de Aroche, Sierra Norte de Sevilla, and Sierra de Hornachuelos) in Andalusia (Spain). The research uses a mixed methodology consisting of, on the one hand, selective interviews with stakeholders focused on tourism and local development processes and, on the other, secondary data to analyse the repercussions on local development. The results show (1) the prevalence among the informants of the economic dimension in local development above the environmental and sociocultural dimensions; (2) the influence of declarations of protection and implementation of development policies on the growth of the tourist offer; (3) uneven tourism development in the different municipalities and natural parks; and (4) the limited effects of tourism on local development.

Ruehssia magalloniae (Apocynaceae; Asclepiadoideae), una especie nueva del bosque mesófilo de montaña de la Sierra Norte de Oaxaca, México

Background: As part of an expedition to checklist the Flora of Oaxaca, a fieldtrip was carried out in the cloud mountain forest of the ‘Sierra Norte’, during which there was a climbing plant found of the genus Ruehssia that differs of any other species in the genus.&#x0D; Questions: The morphology of the corolla, the gynostegial corona and the fruit, as well as the geographical distribution are all elements that provide a basis for distinguishing between species of Ruehssia. Here we propose a new species on the grounds of the cohesive concept of species.&#x0D; Studied species: Ruehssia sp. nov.&#x0D; Study site and dates: Sierra Norte de Oaxaca, México; 1989-2022.&#x0D; Methods: An analysis of the morphology and distribution of the populations of the species in question and related taxa was conducted using the collected specimens and herbarium material. In respect to the IUCN criteria, a vulnerability category was established for the species.&#x0D; Results: The species is similar to Ruehssia rzedowskiana and R. calichicola, but there is a morphological difference regarding the corolla, the gynostegial corona, and its distribution. A morphological description of the new species is provided, in addition to images of the revised taxa, and a map of its geographical distribution and state of conservation. A key to the 18 species of Ruehssia in Oaxaca is also included.&#x0D; Conclusions: Ruehssia magalloniae is recognised as a new species in science. This discovery increases the number of species of Ruehssia listed in Mexico to 39 with a 58 % of endemism.