Son La Prov., Yen Chau Distr., Muong Lum Municipality, Long Phuong village around point 21°01′10”N 104°29′20”E.
Open secondary highly degraded forest on steep alluvial slope at the base of remnant hills composed with highly eroded solid limestone at elevation about 800 m a.s.l.
Terrestrial giant sedge on shady steep slope of small stream. Locally common.
CPC 1838 31 March 2011 Coll.: L.Averyanov, N.T.Hiep, T.B.Ngan.