Gardens' Bulletin Singapore 70 (2): 307–395. 2018 307 doi: 10.26492/gbs70(2).2018-08 The plant taxa of H.N. Ridley, 5. The Gentianales I.M. Turner1, 2, Y.W. Low2, M. Rodda2, K.M. Wong2 & D.J. Middleton2 1Singapore Botanical Liaison Officer, Royal Botanic Gardens Kew, Richmond, Surrey TW9 3AE, U.K.
[email protected] 2Singapore Botanic Gardens, National Parks Board, 1 Cluny Road, 259569, Singapore ABSTRACT. Henry Nicholas Ridley (1855–1956) described more than 450 taxa of Gentianales, mostly from Southeast Asia, and was the author of over 70 additional combinations in this order. A listing of these names with place of publication and the types of the Ridley basionyms is given here. Many names are lectotypified. The new combinations Chassalia pauciflora (Ridl.) I.M.Turner and Chassalia violascens (Ridl.) I.M.Turner are proposed for Cephaelis pauciflora Ridl. and Gartnera violascens Ridl. respecitively. Three names are newly reduced to synonymy: Cephaelis elongata Ridl. to Chassalia bracteata Ridl., Geophila matthewii Ridl. to Mussaenda uniflora Wall. ex G.Don and Psychotria setistipula Ridl. to Ixora patens Ridl. Keywords. Apocynaceae, Gentianaceae, lectotype, Loganiaceae, Rubiaceae, typification Introduction This paper continues an intermittent series on the plant taxa named by Henry Nicholas Ridley (1855–1956). Earlier parts have covered the pteridophytes (Turner & Chin, 1998a), gymnosperms (Turner & Chin, 1998b), Zingiberales (Turner, 2000) and basal angiosperms (Austrobaileyales, Canellales, Chloranthales, Laurales, Magnoliales, Nymphaeales and Piperales) (Turner, 2012). In this installment focus shifts to the Gentianales. Ridley described many plant species, particularly from Southeast Asia. He documented the botanical diversity of the region tirelessly and seemed prepared to tackle all and any taxonomic group of vascular plants that came his way.