FLORA OF VIETNAM
Acanthaceae
Staurogyne purpurea Aver. & K.S. Nguyen

Ha Giang prov., Quan Ba distr., Tung Vai commune, Thang village, around point 23°03ʹ13.4ʺN 104°51ʹ48.8ʺE, steep rocky slopes of stream valley composed with eroded stratified highly eroded limestone at elevation 1000-1200 m a.s.l. Primary evergreen broad-leaved very humid forest. Terrestrial herb to 1.2 m tall on steep shady slope. Flowers purple. Rare. 23 April 2018, L. Averyanov, Nguyen Sinh Khang, Nguyen Tien Hiep, Nguyen Quang Hieu, Chuong Quang Ngan, T. Maisak, VR 750 (holotype – LE01050144, isotype – HN). Species most close to Staurogyne caobangensis D.V. Hai & Joongku Lee, but differs in almost glabrous leaves (vs. leaves densely hairy on both sides), narrowly lanceolate almost glabrous bracts (vs. bracts densely puberulent, ovate to ovate-elliptic), bright purple corolla (vs. corolla pure white) and capitate stigma (vs. stigma dissected into two filiform lobes).