© 2011 E. Schweizerbart sche Verlagsbuchhandlung, Stuttgart, Germany www.schweizerbart.de DOI: 10.1127/1869-6155/2011/0129-0044 1869-6155/2011/0129-0044 $ 01.50 Received November 3, 2010, accepted November 10, 2010 Plant Div. Evol. Vol. 129/1, 71–76 E Stuttgart, March 22, 2011 Nomenclatural adjustments in the tribe Arabideae (Brassicaceae) By Ihsan A. Al-Shehbaz, Dmitry A. German, Robert Karl, Ingrid Jordon-Thaden and Marcus A. Koch Abstract Al-Shehbaz, I.A., German, D.A., Karl, R., Jordon-Thaden, I. & Koch, M.A.: Nomenclatural adjust- ments in the tribe Arabideae (Brassicaceae). — Plant Div. Evol. 129: 71–76. 2011. — ISSN 1869- 6155. Based on extensive molecular studies and critical evaluation of morphological characters, the tribe Stevenieae and the genus Pseudodraba are described as new to science. The Stevenieae include the genera Macropodium, Pseudoturritis, and Stevenia with a total of 11 species; a key separating these three genera is presented. Draba hystrix is placed in the monotypic Pseudodraba due to its morpho- logical distinctness supported by molecular data. Arabis tenuisiliqua and A. tibetica are transferred to the genus Crucihimalaya. Three new combinations, i. e. Pseudodraba hystrix, Crucihimalaya tenui- siliqua, and C. tibetica are formed. Keywords: Brassicaceae, Arabideae, Stevenieae, Arabis, Crucihimalaya, Pseudodraba. Introduction The Brassicaceae (Cruciferae) include 338 genera and 3709 species (Warwick et al. 2006b), though these estimates are outdated and need further revision. The family has long been known as notoriously dificult, in particular the delimitation of its genera and tribes largely because of the substantial occurrence of convergence in every con- ceivable morphological character. However, substantial progress in the phylogenetic relationships and tribal classiication has been made during the past ive years. As many as 44 monophyletic tribes are currently recognized based on molecular data on 308 genera (91% of the family total) combined with critical evaluation of morphology. For its size, the Brassicaceae are among the best studied families phylogenetically, and the interested reader should consult some of the most recent family-wide accounts for further literature and leads (Koch et al. 2003, Al-Shehbaz et al. 2006, Bailey et al. 2006, Beilstein et al. 2006, 2008, Koch et al. 2007, Franzke et al. 2009, German et al. 2009, Koch & Al-Shehbaz 2009, Couvreur et al. 2010, Warwick et al. 2010).