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 60-70 cm tall. Leaves violet beneath, in open place. Common.
HLF 657 25 Dec. 2002.
Coll.Nguyen Tien Hiep, Do Hoang Chung, Vu Hong Van. Grant from Henry Luce Foundation.