Notes on Strobilanthes (Acanthaceae) with capitate inflorescences in Thailand Author Kladwong, Pornchai 0000-0003-3504-7434 Department of Forest Biology, Faculty of Forestry, Kasetsart University, Bangkok 10900, Thailand Author Chantaranothai, Pranom 0000-0002-5065-6169 Department of Biology, Center of Excellence on Biodiversity (BDC) and Applied Taxonomic Research Center (ATRC), Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand & Royal Botanic Gardens, Kew, Richmond, Surrey, TW 9 3 AE, UK text PhytoKeys 2024 2024-07-09 244 89 126 journal article 299637 10.3897/phytokeys.244.124260 0fa35208-01f9-4ac2-a8aa-c616738c6e6c 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]). Figure 8. Strobilanthes phyllostachya Kurz A stem B leaves and inflorescences C bracts D corolla. Photo by P. Suksathan. 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 .