Lasianthus giganteus Naiki (2015:165)

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 : 16

22. Lasianthus giganteus Naiki (2015:165) . Type : ― CAMBODIA. Bokor National Park, 17 October 2012, S. Tagane, K. Fuse, H. N. Choeun 4279 (holotype KYO n.v.; isotype K000342281!).

T hailand: ―PENINSULAR. Nakhon Si Thammarat: Nam Tok Yong National Park, 9 February 2005, L. W. Williams 1291 (BKF, E).

Distribution: ― Cambodia (Bokor National park), Vietnam ( Annam, Bach Ma National Park), Thailand (Peninsular).

Ecology: ―Under semi-shaded evergreen forest at a high elevation of 900‒ 960 m.

Notes: ―This species has the largest leaves and the longest bracts among the Thai species of Lasianthus . Lasianthus giganteus was first reported in Thailand by Naiki et al. (2017). Its clearly differ from other Lasianthus by its large leaves that are 21‒31 × 9‒11 cm, elliptic to lanceolate, petioles 15‒25 mm long, 16‒17 pairs of secondary veins, stipules triangular, persistent and very hard when dried, 3–7 × 3–5 mm, calyx tube campanulate, pilose.