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 6. Strobilanthes consors C. B. Clarke , Bot. Jahrb. Syst. 41 (2): 66. 1907 . Fig. 10 B Type. Thailand , Chiang Mai , Doi Suthep, 13 Dec 1904 , Hosseus 256 ( lectotype M [ M 0168698 image!] designated here; isolectotypes B [ B 101185735 image!], BM [ BM 000906339!], E [ E 00273462!], K [ K 001514905!], L [ L 2841550!], P [ P 00719278 image!]). Distribution. Chamchumroon, Myanmar , Thailand . Ecology. In evergreen forest, granite bedrock; 250–2,500 m alt., flowering and fruiting from September to May. Selected specimens examined. Thailand , Northern: Mae Hong Son , Mae Tala, 1,376 m alt., 28 Apr 2014 , Norsaengsri 10909 ( QBG ); Chiang Mai , Doi Inthanon NP, Doi Ang Ka, 1,600 malt., 26 Dec 1935 , Garrett 1026 ( BKF , K- 2 sheets, KYO ); ibid., Fang, Doi Pha Hom Pok NP, 1,900 –2,000 m alt., 11 May 1905 , Hosseus 606 ( M ); ibid., Doi Suthep-Pui NP, 13 Dec 1904 , Hosseus 256 ( B , BM , E , K , L , M , P ); ibid., ca. 1,680 m alt., 10 Jan 1911 , Kerr 2279 ( BM , K- 2 sheets, L , TCD ); ibid., ca. 1,520 m alt., 24 Dec 1911 , Kerr 2279 A ( BM- 2 sheets, E , L , TCD ); ibid., ca. 1,580 m alt., 22 Sept 1912 , Kerr 2715 ( AAU , BM- 2 sheets, E , K ); ibid., 1,510 m alt., 20 Dec 2009 , Balslev et al. 10029 ( AAU ); Nan , Bo Kluea, Sapan Waterfall, 600 m alt., 17 Nov 1993 , Larsen et al. 44464 ( AAU ); ibid., 780 m alt., 2 Sept 2000 , Srisanga 1587 ( BKF , QBG , CMUB ); Chiang Rai , Doi Chang, 1,260 –1,765 m alt., 11 Jan 1922 , Rock 1771 ( E , US ); Lamphun , Mae Tha, Doi Khun Tan NP, 1,200 m alt., 20 Nov 1993 , Maxwell 93-1407 ( BKF- 2 sheets, CMUB , L ); Lampang , Chae Son NP, 875 m alt., 24 Oct 1995 , Maxwell 95-991 ( BKF , CMUB ); ibid., Doi Luang NP, 1,125 m alt., 8 Nov 1998 , Petrmitr 335 ( CMUB , L ); North-eastern: Loei , Phu Kradueng NP, 1,250 m alt., 9 Sept 1988 , Takahashi & Tamura 63463 ( BKF ); ibid., Phu Luang WS , 1,150 –1,530 m alt., 24 Dec 1982 , Koyama et al. 31617 ( KYO- 2 sheets); ibid., Phu Ruea NP, 980–1,151 m alt., 23 Dec 1982 , Koyama et al. 31543 ( BKF , KYO ). Preliminary conservation status assessment. This species has an Extent of Occurrence ( EOO ) of 73,029.391 km 2 and an Area of Occupancy ( AOO ) of 76.000 km 2 and is assessed as Least Concern ( LC ) following IUCN (2022 ). Notes. Hosseus 256 and Hosseus 606 were cited in the original protologue of S. consors ( Hosseus 1907 ) . Hosseus 256 has seven duplicates one in each of B [ B 101185735], BM [ BM 000906339], E [ E 00273462], K [ K 001514905], L [ L 2841550], M [ M 0168698] and P [ P 00719278] whereas Hosseus 606 has only one duplicate deposited at M [ M 0168699]. M 0168698 has the original label “ Strobilanthes consors sp. nova . ” and the original description in Clarke ’ s handwriting. Moreover, this specimen has mature leaves, inflorescences and flowers. We, therefore, select the sheet M 0168698 as the lectotype of S. consors .