FLORA OF VIETNAM
Rubiaceae
Uncaria macrophylla Wall.
Verde.Ha Giang Prov., Vi Xuyen Distr., Tung Ba municipality, Khau Ca NR.
Primary broad-leaved humid evergreen forest on very steep slopes and along rocky ridge composed with solid crystalline highly eroded limestone at elevation 700-1150 m a.s.l. around point 22°50′43.9″N 105°07′18.5″E.
Shrub climbering 4-5 m high. Common.
09 May 2015 CPC 7849 Coll.: N.Q. Hieu, N.T.Hiep, T.B. Ngan, C.Q. Ngan, D.K. Harder, C. P. Tuy, G.C.Pao