Systematic Botany (2009), 34(1): pp. 182–197 © Copyright 2009 by the American Society of Plant Taxonomists Phylogenetic Classification of Subtribe Castillejinae (Orobanchaceae) David C. Tank, 1,3, 4 J. Mark Egger, 2 and Richard G. Olmstead 1,2 1 Department of Biology, University of Washington, Box 355325, Seattle, Washington 98195 U.S.A. 2 Herbarium, Burke Museum of Natural History, University of Washington, Box 355325, Seattle, Washington 98195 U.S.A. 3 Present Address: Department of Forest Resources and Stillinger Herbarium, University of Idaho, PO Box 441133, Moscow, Idaho 83844-1133 U.S.A. 4 Author for Correspondence (
[email protected] ) Communicating Editor: Lena Struwe Abstract— Recent molecular systematic research has indicated the need for a revised circumscription of generic boundaries in subtribe Castillejinae (tribe Pedicularideae, Orobanchaceae). Based on a well-resolved and well-supported phylogenetic hypothesis, we present a for- mal reclassification of the major lineages comprising the Castillejinae. Prior to this treatment, subtribe Castillejinae included Castilleja (ca. 190 spp.), Cordylanthus (18 spp.), Orthocarpus (9 spp.), Triphysaria (5 spp.), and the monotypic genera Clevelandia and Ophiocephalus. In the clas- sification presented here, Orthocarpus and Triphysaria retain their current circumscriptions, Castilleja is expanded to include Clevelandia and Ophiocephalus , and Cordylanthus is split into three genera; a key to the genera as they are recognized here is provided. Two new combinations, Castilleja beldingii and Castilleja ophiocephala , are proposed within the expanded Castilleja . The concept of Cordylanthus is restricted to the 13 species formerly recognized as subg. Cordylanthus , while subg. Dicranostegia and subg. Hemistegia are elevated to genus level ( Dicranostegia and Chloropyron , respectively).