Thursday, March 23, 2023

[Botany • 2021] Primulina silaniae (Gesneriaceae) • A New Species from the Limestone Area of Guizhou Province, China

Primulina silaniae X.X.Bai & F.Wen, 

in Zhang, Huang, Li, Huang, Li, Zhou, Chen, Wen et Bai, 2021. 
思兰报春苣苔  ||  DOI: 10.3897/phytokeys.185.72099

Primulina silaniae X.X.Bai & F.Wen, a new species of Primulina Hance (Gesneriaceae) from the limestone area of Wangmo County, Guizhou Province, is described and illustrated. The new species is similar to P. spiradiclioides Z.B.Xin & F.Wen, but can be easily distinguished from the latter by a combination of characteristics, especially in the lateral veins of its leaf and floral shape and tube. At present, three populations in one locality of this new taxon were found, totaling about 600 mature individuals. According to the IUCN Red List Categories and Criteria (Version 3.1), the species is provisionally assessed as Vulnerable [VU D1].

Keywords: flora of Guizhou, karst, new taxon, taxonomy, subtribe, Didymocarpinae

Primulina silaniae X.X.Bai & F.Wen, sp. nov.
 A habit B adaxial (left) and abaxial (right) surfaces of leaves C flowering cyme D young capsules E dissected calyx lobes F half opened corolla cover, showing stamens G stamens with cohering anthers.
 Drawn by Yi Chen from the holotype.

Primulina silaniae X.X.Bai & F.Wen, sp. nov.
 A, B habitat C front view of flower D, E oblique side view of flowers F plant G adaxial (left two) and abaxial (right two) surfaces of leaves H corolla I partial, enlarged leaf J partial, enlarged corolla tube K stamen L coherent anthers M dissected calyx lobes N lower distal part of corolla O pistil, pedicel and calyx with sepals removed P, Q dehisced and immature fruits.
 Photographs by Xin-Xiang Bai.

Primulina silaniae X.X.Bai & F.Wen, sp. nov.
Diagnosis: The new species is similar to Primulina spiradiclioides, but can be easily distinguished from the latter by leaf margin entire with occasionally a few long hairs, glabrous on adaxial and abaxial surfaces (vs. margin serrate and not villous, lamina adaxial and abaxial surfaces densely whitish villous), no lateral veins on adaxial and abaxial surfaces (vs. inconspicuous on adaxial surfaces, distinctly raised on abaxial surface), pedicels 8–31 mm long (vs. ca. 5 mm), calyx inside glabrous (vs. sparsely pubescent), bluish-purple corolla lobes, with two short brownish-yellow stripes in the white throat (vs. corolla mouth white, forming a conspicuous pentagon), corolla tube slightly curved (vs. straight), ovary ca. 6mm long (vs. 2–2.5 mm), style 19–22 mm long (vs. ca. 2.5 mm), capsule, 8–9 mm long (vs. 10–15 mm).

Etymology: The epithet ‘silaniae’ is coined to honour Prof. Si-Lan Dai, the famous horticulturist at the Beijing Forestry University. She is also the former supervisor of one of the authors, Prof. Xin-Xiang Bai. Meanwhile, one of the given names of Prof. Si-Lan Dai, namely ‘Lan’, shares the same pronunciation in Chinese with the color blue. Thus, the scientific name also hints at the bluish to purplish-blue corolla of this new taxon.

Vernacular name: Sī Lán Bào Chūn Jù Tái (Chinese pronunciation); 
思兰报春苣苔 (Chinese name).

Jin-Quan Zhang, Hong Huang, Mei-Jun Li, Mei Huang, Quan-Yuan Li, Yu-Lu Zhou, Yi Chen, Fang Wen and Xin-Xiang Bai. 2021. Primulina silaniae sp. nov. (Gesneriaceae) from the Limestone Area of Guizhou Province, China. PhytoKeys. 185: 123-130. DOI: 10.3897/phytokeys.185.72099