Lasianthus curtisii King & Gamble (1904:128)

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 : 13

14. Lasianthus curtisii King & Gamble (1904:128) . Type (lectotype designated by Zhu 2002):— MALAYSIA. Penang,

Timur Laut, Western Hill, C. Curtis 284 (lectotype SING0059250 image!).

= Lasianthus kwangtungensis Merrill (1929b:323) . Type: ― CHINA. Hongkong, 3 April 1928, Y. Tsiang 55 (isotype K000763829!).

= Lasianthus pseudolucidus King & Gamble (1904:128) . Type: — MALAYSIA. Perak, May 1892, L. Wray 4109 (isotype SING0059235 image!).

T hailand: —NORTH-EASTERN. Loei: Phu Kradung National Park, 2‒3 November 1984, G. Murata et al. T-42855 (BKF, L). EASTERN. Chaiyaphum: Khon Sarn, December 1994, C. Wongsatit s.n. (BK). PENINSULAR. Surat Thani: Koh Pangan, 4 December 1974, R. Geesink, P. Hiepko & C. Phengklai 7782 (BKF, K, L). Nakhon Si Thammarat: Khao Luang National Park, 23 August 1995, K. Larsen et al. 45902 (AAU, BKF, PSU, QBG).

Distribution: — China, Japan (Amami, Kyushu, Ryukyu), Cambodia, Vietnam, Peninsular Malaysia, Indonesia (Sumatra), Thailand (North-Eastern, Eastern, Peninsular).

Ecology: —Grows on granitic soil or along streams in evergreen forest at an elevation of 100‒1250 m.

Notes: ―In Thailand, in the field Lasianthus curtisii may look like L. lucidus Blume (1826:997) but it differs by leaf and calyx characters: Lasianthus curtisii has subcoriacious, ovate-lanceolate or elliptic-lanceolate leaves with 4‒6 pairs of lateral veins, and the calyx divided nearly to the base into 5 lanceolate lobes. Lasianthus lucidus , in contrast, has mostly membranaceous, ovate or ovate-elliptic leaves with 3‒4 pairs of lateral veins, and the calyx widely campanulate with 5 lanceolate lobes.