N.Vietnam, Bac Kan Prov., Ba Be Distr., Nam Mau Municipality: mountaine betwen Khau Cum to Nam Dai. Ba Be National Park around point 22(26′311N 105(36′ 669 E.
Selectly logged primary evergreen closed broad-leaved forest on top mountain composed with crystalline highly eroded marble-like limestone at elevation 386 m a.s.l.
Herb up to 60-100 cm tall. Flower white, Aromatic On Rock at open place. Very common.
HLF 658 25 Dec. 2002.
Coll.Nguyen Tien Hiep, Do Hoang Chung, Vu Hong Van. Grant from Henry Luce Foundation.