FLORA OF VIETNAM Rubiaceae Spiradiclis sp. (Det. Dr.Aaron Davis 08 04 2003)
N. Vietnam, Thai Nguyen prov., Vo Nhai distr., Than Sa municipality, vicinities of Kim Son village (N 21°48′ E 105°54′), 23.3 km to 18° of Thai Nguyen city. Primary broadleaved evergreen dry forest on very steep rocky slopes of karst remnant limestone ridge at elev. 300-450 m a.s.l. Lithophytic adpressed forb on shady sliffs. Common. Usual codominanthe of lithophytic forb communities at 300-550 m.