Raphiocarpus axillaris D.J.Middleton

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

5. Raphiocarpus axillaris D.J.Middleton in Middleton et al. (2021: 2), Xin et al. (2022: 4).

Type: — VIETNAM. Vinh Phuc: Tam Dao National Park, Tam Dao 2, 1044 m, 21°28′44.0′′N 105°37′39.6′′E, 22 September 2011, Q.B. Nguyen et al. VMN-B1494 (holotype SING, isotypes E, P, PR, VNMN)

Distribution:—The species is known solely by the type collection in N Vietnam (Vinh Phuc Province.

Ecology and phenology:—It grows in humid evergreen broad-leaved montane forests on rhyolites at elevations of about 1050 m a.s.l. Flowers in September–October.

Conservation status:—The species is currently known only from one location, found in Tam Dao National Park, with a total occupancy area surely less than 4 km 2. Taking into consideration rising tourist activity, the conservation status of the species was proposed as Vulnerable (VU D2) following IUCN 2023 criteria ( Middleton et al. 2021).