Abstract
Spiradiclis tubiflora, a new Rubiaceae species, is described from a limestone area of southern China. It is similar to Spiradiclis glandulosa and S. umbelliformis, but differs from the latter two in its linear stipule, short peduncle and tubular-funnelform corolla with a distinctively enlarged tube. The colour photograph, illustrations, detailed descriptions and conservation status of the new species are provided.
Highlights
Caves are considered to be extreme and exceptional habitats that usually provide insufficient resources, especially lack of light, water and soil for plants to survive (Whitten 2009)
Spiradiclis Blume exhibits a great diversity in cave habitat with six newly published species from karst caves (Deng et al 2014, Wen et al 2015, Wu et al 2015a, 2015b, 2016, Liu et al 2018)
Morphological observations and measurements of the new species are based on living material in the field, as well as dry specimens
Summary
Caves are considered to be extreme and exceptional habitats that usually provide insufficient resources, especially lack of light, water and soil for plants to survive (Whitten 2009). There are approximately 53 Spiradiclis species worldwide, most representatives being herbs and occurring in limestone areas (Chen and Taylor 2011, Deng et al 2014, Wang et al 2015, Wen et al 2015, Wu et al 2015a, 2015b, 2016, 2019, Wang 2016a, 2016b, Pan et al 2016, 2019, Liu et al 2018). Spiradiclis can be distinguished from Ophiorrhiza by its linear-oblong or subglobose capsules with two or four valves when mature (vs obcordate and compressed capsules with two valves when mature) (Lo et al 1983, Robbrecht 1988, Lo 1999, Chen and Taylor 2011). After re-collections of flowers and fruit materials and further comparison of the known Spiradiclis species, we confirmed that it is an unpublished species and report it here
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