FLORA OF VIETNAM Aristolochiaceae Asarum caudigerum Hance Northern Vietnam, Ha Giang Prov., Yen Minh Distr., Du Gia municipality, Giang Chu D village (Du Gia Nature Reserve). Primary broad-leaved evergreen closed wet forest on very steep slopes and cliffs of rocky ridges and mesae composed with solid marble-like stratified limestone, around point 22°56?00? N, 105° 08? 44?E, 1622 m a.s.l. near main field camp. Herb 30 cm, perennial, leaves hairy, common in humus and wet soil, shade. CPC 312 16 May 2010 . Collectors: N. Q.Hieu, N.T. Hiep, N. T. Vinh, H.V.Chung (Funded by Critical Ecosystem Partnership Fund-CEPF through FFI)