No.15 CONG DING, ANG LIU, XUN-LIN YU& CHUN-PING ZHANG

Primulina cataractarum sp. nov. (Gesneriaceae) from limestone landform in

Southern Hunan, China

Phytotaxa 511(1): 051-064

ABSTRACT

A new species, Primulina cataractarum (Gesneriaceae) from limestone areas in southern Hunan, China, is described and illustrated with photographs based on morphological and molecular data. This new species is slightly similar to P. porphyrea and P. rubribracteata in morphology, but it can be easily distinguished by its smaller rounder leaves, large repand green bracts and purple corolla tube. Phylogenetic analysis proved that these three species are different, and their relationships are relatively distant. It also reveals that P. cataractarum is genetically similar to P. jiangyongensis, which is geographically next to the type locality of the new species, but they differ greatly in morphology. Following the IUCN Red List Criteria, P. cataractarum is assessed as Critically Endangered (CR B2a; C2b) because of its limited populations and vulnerable habitat.

Original article link:https://doi.org/10.11646/phytotaxa.511.1.4

FIGURE 1. The Bayesian phylogenetic tree from ITS sequence data with BI posterior probability/MP bootstrap support values (>0.5 or50%) shown above and below the corresponding branches. * indicates the new species.

FIGURE 2. The Bayesian phylogenetic tree from trnL-F sequence data with BI posterior probability/MP bootstrap support values (>0.5or 50%) shown above and below the corresponding branches. * indicates the new species.

FIGURE 3. The Bayesian phylogenetic tree from atpB-rbcL sequence data with BI posterior probability/MP bootstrap support values(>0.5 or 50%) shown above and below the corresponding branches. * indicates the new species.

FIGURE 4. The Bayesian phylogenetic tree based on the combined data of the ITS and two plastid regions (trnL-F and atpB-rbcL). BIposterior probability/MP bootstrap support values (>0.5 or 50%) are shown above and below the corresponding branches. * indicates thenew species.

FIGURE 5. Primulina cataractarum X.L.Yu & A.Liu. A. Plant B. Flower side view. C. Front view of flower. D. Opened corolla showing stamens and staminodes. E. Stamens. F. Stigma. G. Pistil. H. Bracts and bractlet. I. Calyx. J. Capsule. (Drawn by Jing Tian).

FIGURE 6. Primulina cataractarum X.L.Yu & A.Liu. A. Habitat. B. Flowering individual. C. Population. D. Left view of flower and both surfaces of leaves. E. Abaxial leaf blade surface and inflorescence and bracts. F. Corolla, stamens showing staminodes, pistil and disc. G. Front view of flower. H. Opened corolla showing stamens. I. Stigma. J. Inflorescence, bracts, bractlet and calyx. K. Bracteoles. L. Disc.M. Calyx. N. Mature capsule.

FIGURE 7. Holotype of Primulina cataractarum X.L.Yu & A.Liu. (CSFI JH0001).