Raphiocarpus asper (Drake) B.L.Burtt

Nguyen, Cuong Huu, Wen, Fang, Pham, Toai Minh, Nguyen, Yen Thi, Bui, Thanh Minh, Bui, Doi The, Nguyen, Khang Sinh & Averyanov, Leonid V., 2023, The checklist of Raphiocarpus species (Gesneriaceae, Didymocarpinae) in the flora of Vietnam with the description of a new species, R. bicallosus, Phytotaxa 616 (3), pp. 223-234 : 230

6. Raphiocarpus asper (Drake) B.L.Burtt in Weber & Burtt (1998: 172), Nguyen & Wen (2018: 1424), Vu (2018: 48)

≡ Didissandra aspera Drake (1890: 127) , Ho (2000: 16), Phuong (2005: 421).

Lectotype (designated here): — VIETNAM. Hanoi: Forêts du Mont-Bavi, près de Thu-Phap , 11 September 1886, B.Balansa 4290 ( P04060157 photo! isolectotypes P04060155, P04060156, P04060158, photos!) .

Distribution:—The species is endemic to Vietnam reported from (Hanoi City Area, provinces Quang Ninh, Nghe An, Khanh Hoa, and also from Vinh Phuc, Hoa Binh, Ninh Binh, and Thanh Hoa (fide Vu 2018).

Ecology and phenology:—It grows in evergreen broad-leaved submontane forests on various rocks at elevations of about 1000 m a.s.l. Flowers in August–September.

Conservation status:—Due to broad distribution of this species found in various habitat conditions its conservation status may be provisionally estimated as Least Concerns following criteria od IUCN (2023).

Note:—The specimen ( P04060157 ) is chosen as the lectotype among the four available authentic specimens ( P04060157 , P04060155 , P04060156 , and P04060158 ) from the same gathering solely indicated in the protologue (Balansa 4290) because it has well-developed leaves, prepared flattened flowers, fruits, and analytical authentic drawings of floral details.

Additional specimens examined:— VIETNAM. Quang Ninh: Vicinity N.- E. of Mon-cay , 1–8 October 1936, W. T.Tsang 26935 ( P photo) .