61. Lasianthus subcalvus Craib (1933:27). Type: ― THAILAND. Chanthaburi: Khao Soi Dao, 27 April 1930, A. F. G. Kerr 19421 (holotype K000777003!). (Figure 3 Af & 3Ag). Thailand: ―PENINSULAR. Nakhon Si Thammarat: 1958, Th. Sorensen, K. Larsen, B. Hansen 677 (AAU, BKF). Trang: Khao Chong, 23 March 1966, C. Boonnab 467 (BKF), 19 January 1966, C. Boonnab 304 (BKF), 10 September 1990, C. Puff, A. Igersheim & V. Urchirakal 900910-1/17 (BKF, WU), Thung Khai, 11 July 2000, V. Chamchumroon VC840 (BKF). Satun: Thale Ban National Park, 12 September 1990, C. Puff, A. Igersheim & V. Urchirakal 900912-2/6 (BKF, WU). Distribution: ―Endemic to Thailand (South-Eastern, Peninsular). Ecology: ―Moist evergreen forest, in shaded places at an elevation of 100‒ 300 m. Flowering in March‒April and fruiting in May‒June. Notes: ― Lasianthus subcalvus has large flowers, 10‒12 mm long, 4 lobed, pilose, fruits fusiform, 1‒2 cm long, glabrous or subglabrous. This species can often be found with flowers and fruits in the field and they often remain on herbarium sheets.

Published as part of Napiroon, Tiwtawat, Chayamarit, Kongkanda, Dawson, Sally, Till, Walter & Balslev, Henrik, 2020, A synopsis of Lasianthus (Lasiantheae, Rubiaceae) in Thailand and two additional new species, pp. 1-38 in Phytotaxa 439 (1) on page 31, DOI: 10.11646/phytotaxa.439.1.1, http://zenodo.org/record/13873503