Begonia dryadis Irmscher, 1951

Ding, Hong-Bo, Maw, Mya Bhone, Yang, Bin, Bouamanivong, Somsanith & Tan, Yun-Hong, 2020, An updated checklist of Begonia (Begoniaceae) in Laos, with two new species and five new records, PhytoKeys 138, pp. 187-201 : 187

Begonia dryadis Irmscher Figure 3 F-K

Begonia dryadis Irmscher, Not. Bot. Gard. Edinb. 21(1): 41. 1951; T.C. Ku in T.L. Wu (ed.), Fl. Reipubl. Popularis Sin. 52(1): 246. 1999; S.H. Huang & Y.M. Shui in C.Y. Wu (ed.), Fl Yunnan. 12: 215. 2006; T.C. Ku et al. in C.Y. Wu & P.H. Raven (eds), Fl. China 13: 171. 2007. Type: China, Yunnan Province, Kuen-ger, Che-li Hsien, 1100 m elev., October 1936, C.W. Wang 79349 (holotype: KUN0370809).

Specimens examined.

Laos. Oudomxay Province, Maung Xai, Phou Hin Phee National Biodiversity Conservation Area, 20°43'18.52"N, 102°08'47.16"E. 1368 m elev., 30 March 2018, Y.H. Tan, B. Yang, H.B. Ding & X.D. Zeng L0356 (HITBC; HNL); Oudomxay Province, Maung Xai, Phou Hin Phee National Biodiversity Conservation Area, 20°43'18.74"N, 102°08'47.84"E. 1364 m elev., 25 October 2018, Y.H. Tan & H.B. Ding L0815 (HITBC).

Distribution.

Chian, Laos.

Note.

This species was first discovered and reported in the forest understorey, by streams in a valley of South Yunnan, China. The discovery of this species in Laos shows the geographical linkage between two type localities. The species is differentiated from the allied species by its short, stout rhizome and the presence of cauline leaves. ( Irmscher 1951; Ku 1999; Huang and Shui 2006; Ku et al. 2007).

Figures

Figure 3. A-E Begonia augustinei Hemsley: A habitat B staminate flowers (front view) C leaf blade (adaxially and abaxially) D pistillate flowers E cross section of ovary F-K Begonia dryadis Irmscher: F habitat G staminate flowers (front view) H pistillate flower (front view) I pistillate flower (lateral view) J fruit K cross section of ovary. Photographed by H. B. Ding.