Euphorbiaceae Trigonostemon ? Thai Nguyen Prov., Vo Nhai Distr., Than Sa Mun., Than Sa vill., around point 21?47′47″ N, 105?53′25″ E, 49 m a.s.l.
Scattered in secondary closed evergreen broad-leaved lowland forests, foot of limestone mountains. Small evergreen tree, up to 5-7 m tall, dbh 0.2 m; flowers yellow; peduncle of fruits from bottom to top bigger; fruits with some short and big spines.
HAL 9173 28 Aug 2006 Photos: Id. by Phan Ke Loc Collectors: Phan Ke Loc, Nguyen Tien Vinh and Nguyen Sinh Khang
Collected with the financial support from NYBG, U.S.A.