20. Strobilanthes phyllostachya Kurz, J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 40 (1): 75. 1871.

Figs 8, 11 C

Sericocalyx phyllostachyus (Kurz) Bremek., Verh. Kon. Ned. Akad. Wetensch., Afd. Natuurk., Sect. 2. 41 (1): 163. 1944.

Type.

Myanmar, Bago Region [Beeliz], Brandis s. n. (syntype K! [without barcode]).

Distribution.

Myanmar, Thailand.

Ecology.

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

Selected specimens examined.

Thailand, Northern: Mae Hong Son, Mae Sariang, 400 m alt., 21 Feb 1982, Wongprasert 6 (BKF- 2 sheets, K, L, P); ibid., Huai Ngae, 350 m alt., 14 Feb 1971, Smitinand & Boonkird 11422 (BKF); 450 m alt., 13 Jan 1988, Santisuk 6668 (BKF- 2 sheets); ibid., Salawin WS, Huai Ka Han, 500 m alt., 23 Mar 2006, Watthana & Wongnak 1860 (QBG); ibid., Sob Moei, 950 m alt., 24 Jan 2015, Pongamornkul 4782 (QBG); ibid., Mae Ngao NP, 13 Jan 2015, Tanming 757 (QBG); Tak, Mae Ngo NP, 395 m alt., 23 Dec 2010, Suksathan et al. 5336 (L); ibid., Tha Song Yang, 22 Mar 2006, Pooma et al. 6226 (AAU, BKF- 2 sheets, QBG); South-western: Kanchanaburi, Thong Pha Phum, 14 Dec 1993, Parinya et al. 364 (BK); ibid., Wangka, Kwae Noi River Basin, 150 m alt., 13 May 1949, Kostermans 412 (K).

Preliminary conservation status assessment.

This species has an Extent of Occurrence (EOO) of 10,101.500 km 2 and an Area of Occupancy (AOO) of 28.000 km 2 and is assessed as Vulnerable (VU), B 1 a, b (i, ii, iii) following IUCN (2022). This species grows near streams in evergreen forest or bamboo forest with a few records. The changes of the habitat through increasing droughts and fire are likely to lead to the decline of S. phyllostachya .

Notes.

Strobilanthes phyllostachya is distinguishable from S. squalens S. Moore by its elliptic bract and hairlessness on the outside of the corolla. This species was formerly only known from Myanmar (Kurz 1871; Wood et al. 2022), but is now newly recorded from the Northern and Southwestern floristic regions of Thailand.