FLORA OF VIETNAM
Rubiaceae
Spiradiclis karstana L. Wu, X. Li & Q.R. Liu

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566°N 105.02142°E. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Terrestrial herb or undershrub to 1 m tall in open rpcky place. Flowers purple. Occasional. 11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1558 (HN, LE01067021, LE01070220).