Lasianthus longipedunculatus Parker (1925:430)

Napiroon, Tiwtawat, Chayamarit, Kongkanda, Dawson, Sally, Till, Walter & Balslev, Henrik, 2020, A synopsis of Lasianthus (Lasiantheae, Rubiaceae) in Thailand and two additional new species, Phytotaxa 439 (1), pp. 1-38 : 21

33. Lasianthus longipedunculatus Parker (1925:430) . Type : ― MYANMAR. Tavoy, 13 November 1924, R. N. Parker 2208 (holotype K000031679!; isotype A00096530 image!).

T hailand: ―PENINSULAR. Chumphon: Langsuan, 1 March 1927, A. F. G. Kerr 12166 (AAU, BKF, K). Ranong: Khlong Na Kha Wildlife Sanctuary, 6‒7 July 1993, C. Puff & K. Sridith 930706-1/6 (AAU, BKF, PSU, WU), 6 September 1984, N. Fukuoka & W. Na nakhon T35911 (BKF). Surat Thani: Khao Sok National Park, 3 May 2006, S. Gardner s.n. (BKF, K). Phang Nga: Kuraburi, Khlong Saeng Wildlife Sanctuary, 11 September 1984, N. Fukuoka & W. NanaKhon T36080 (BKF).

Distribution:— Myanmar, Thailand (Peninsular), Vietnam.

Ecology; ― Moist evergreen forest at an elevation of 50‒200 m. Flowering in May‒July , fruiting August‒ September .

Notes: ― Lasianthus longipedunculaus is distinct from other species in having peduncles that are 4‒10 cm long which is the longest among Thai Lasianthus . In addition, it has glabrous branches, branchlets and leaves, linear-lanceolate bracts that are 8‒12 mm long and it has veins on the bracts which are leaf-like, the calyx tube is 2‒3 mm long, with 4 calyx lobes, the corolla tube is usually 9‒10 mm long, glabrous on the outside and pilose on the, inside, the drupes are ellipsoid, 1‒1.5 cm long, and they each have 4 pyrenes.