Abstract
Impatiens longiaristata (Balsaminaceae), a new species from western Sichuan Province in China, is described and illustrated here based on morphological and molecular data. It is similar to I. longiloba and I. siculifer, but differs in its lower sepal with a long arista at the apex of the mouth, spur curved downward or circinate, and lower petal that is oblong-elliptic and two times longer than the upper petal. Molecular analysis confirmed its placement in sect. Racemosae. Simultaneously, during the inspection of the protologues and type specimens of allied species, it was found that the types of two names from this section were syntypes based on Article 9.6 of the International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code). According to Articles 8.1, 9.3, and Recommendations 9A.1, 9A.2, and 9A.3, the lectotypes of these two names are here designated.
Highlights
The morphological description of new species was based on careful field observation of plants, measurement of herbarium specimens, as well as plant photographs taken in the field
Diagnosis: Impatiens longiaristata is similar to I. longiloba and I. siculifer, but can be distinguished by its lower sepal with a long arista (1 cm) appearance from the bud stage, spur curved downward or circinate, and lower petal that is oblong-elliptic, tip rounded, and two times longer than the upper petal
We found that three gatherings of herbarium were cited in protologues of I. aquatilis and four gatherings were cited in protologues of I. clavicuspis
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Since Hooker and Thomson [6] provided the first infrageneric classification for Impatiens based only on morphological data, several infrageneric classifications of the genus have been proposed in the last century [7,8,9]. Phylogenetic studies using nucleotide sequences have made great contributions to our understanding of the evolutionary relationships of Impatiens in the last two decades [4,5,10,11,12,13] Of these studies, the most notable is that in which Yu et al [5] proposed a new classification based on phylogenetic and morphological evidence in 2016. The most notable is that in which Yu et al [5] proposed a new classification based on phylogenetic and morphological evidence in 2016 They divided this genus into two subgenera: I. subgen. In the present study on Impatiens from China, a new species is described, and lectotypes are designated for two names
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