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 2. Strobilanthes articulata J. B. Imlay , Bull. Misc. Inform. Kew 1939 (3): 121. 1939 Fig. 10 A Type. Thailand , Chanthaburi , Khao [Kao] Soi Dao, 12 Dec 1924 , Kerr 9630 ( lectotype BM [ BM 001191001!] designated here; isolectotypes ABD [ ABDUH : 2 / 887 image!], BK [257638!], C [ C 10005193 image!], K [ K 001096856!, K 001096857!], KYO !). Distribution. Endemic to Thailand . Ecology. In evergreen forest, often on rocks; 1,300 m alt, flowering and fruiting December. Specimens examined. Thailand , South-eastern: Chanthaburi , Khao Soi Dao, 1,300 m alt., 12 Dec 1924 , Kerr 9630 ( BK , BM , K- 2 sheets, KYO ). Preliminary conservation status assessment. This species is only known from its type locality and is assessed as Data Deficient ( DD ) following IUCN (2022 ). More field work is needed to assess the conservation status of S. articulata . Notes. Strobilanthes articulata superficially resembles S. dimorphotricha Hance in having zigzag stems in the upper parts, strongly unequal leaf pairs and glabrous and caducous bracts, but it differs in having no bracteoles vs. present in S. dimorphotricha . Strobilanthes articulata was described by Imlay (1939) based on Kerr 9630 which has seven duplicates. Two of which are at K [ K 001096856, K 001096857] and one at each of ABD [ ABDUH : 2 / 887], BK [257638], BM [ BM 001191001], C [ C 10005193] and KYO . BM 001191001 has Imlay ’ s handwriting as follows: “ Strobilanthes articulata Imlay Type no. ”, and it also has the mature fruit and corolla which correspond with the protologue. Therefore, we select it as the lectotype .