Tropical Natural History 12(2): 207-244, October 2012 2012 by Chulalongkorn University The Genus Indigofera L. (Leguminosae) in Thailand SAWAI MATTAPHA1 AND PRANOM CHANTARANOTHAI2* 1Department of Biology, Faculty of Science, Udon Thani Rajabhat University, Udon Thani 41000, THAILAND 2Applied Taxonomic Research Center, Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, THAILAND * Corresponding author. E-mail:
[email protected] Received: 7 December 2011; Accepted: 28 August 2012 ABSTRACT.– An account of the 30 species (32 taxa) of Indigofera L. found in Thailand is presented, with keys, descriptions, cited specimens, a line drawing, distribution and photographs. I. kasinii Boonyamalik is placed in synonymy of I. lacei. I. laxiflora is lectotypified. KEY WORDS: Indigofera, lectotype, synonym, taxonomy, Thailand (1928). In his treatment, he recognized 22 INTRODUCTION species. The aim of this paper is to describe and provide keys for the 30 species (32 Indigofera L. is the largest genus of the taxa) found in Thailand. tribe Indigofereae, family Leguminosae- Papilionoideae. The genus contains around 700 species found in the tropics and MATERIALS AND METHODS subtropics of the Old and New World (Polhill & Raven, 1981). The genus was The revision is based on the study of first described by Linnaeus in 1753 based on herbarium specimens from the following the three species of I. tinctoria, I. hirsuta herbaria: AAU, BCU, BK, BKF, BM, C, and I. glabra. Later, the first one was CMU, E, K, KKU, L, P, PSU, QBG, SING selected as the lectotype of the genus by and TCD (The abbreviations follow Thiers, Fawcett & Rendle (1920).