A new species of Kopsia Apocynaceae, Rauvolfioideae) from Vietnam

The new species Kopsia vidalii D.J.Middleton is described from a specimen collected in Vietnam. It is most clearly recognisable from other species of Kopsia which have the stamens inserted in the upper part of the corolla tube by the combination of short corolla tube, ≤ 15 mm long, and narrow corolla lobes, c. 6.5 times as long as wide. A key to the species of Kopsia in Vietnam is given.