23. Strobilanthes squalens S. Moore, J. Nat. Hist. Soc. Siam 4: 151. 1921.

Figs 9 B, 11 D

Sericocalyx thailandicus Bremek., Dansk Bot. Ark. Dansk Bot. Ark. 20: 68. 1961. Type: Thailand, Chanthaburi, between Makham and Soi Dao, 100–200 m alt., 14 Jan 1958, Sørensen et al. 241 (holotype L [U 0000114!]: isotype C [C 10005215 image!]), syn. nov.

Type.

Vietnam, South Annam, Langbian, Dran, Mar 1918, Kloss s. n. (holotype BM [BM 000810180!]).

Distribution.

Thailand, Vietnam.

Ecology.

Near stream in evergreen forest or bamboo forest; 10–1,000 m alt., flowering and fruiting from November to March.

Specimens examined.

Thailand, Eastern: Si Sa Ket, Kantharalak, Khao Phra Wihan NP, 400 m alt., 21 Dec 2005, Pooma et al. 6036 (BKF); ibid., 200 m alt., 22 Dec 2005, Pooma et al. 6091 (BKF, E, L); Central: Saraburi, Mueang, Sam Lan Forest, 125 m alt., 18 Feb 1974, Maxwell 74-164 (AAU, BK); ibid., 100 m alt., 26 Jan 1975, Geesink & Maxwell 8377 (BKF, L); South-eastern: Chon Buri, Sriracha, Nong Kam Kheo, ca. 122 m alt., 1 Dec 1927, Collins 1832 (BK, BM, K); Chanthaburi, between Makham and Soi Dao, 100–200 m alt., 14 Jan 1958, Sørensen et al. 241 (C, L); ibid., Tap Sai, 200 m alt., 17 Dec 1924, Kerr 9693 (BK, BM, K); ibid., 200 m alt., 19 Dec 1924, Kerr 9693 A (BK, BM).

Preliminary conservation status assessment.

This species has an Extent of Occurrence (EOO) of 46,083.781 km 2 and an Area of Occupancy (AOO) of 16.000 km 2 and is assessed as Least Concern (LC) following IUCN (2022).

Notes.

Strobilanthes squalens was formerly thought to be an endemic to Southern Vietnam (Baker et al. 1921), but it is now found to occur in the Eastern and Central floristic regions of Thailand.

Sericocalyx thailandicus was described by Bremekamp (1961). After investigation of type specimens from Thailand, we find that this species is conspecific with S. squalens . Therefore, S. thailandicus is placed as a synonym of S. squalens .