A Synopsis of the Genus Hoffmannseggia (Leguminosae)
NUMBER 9 SIMPSON AND ULIBARRI: SYNOPSIS OF HOFFMANNSEGGIA 7 A SYNOPSIS OF THE GENUS HOFFMANNSEGGIA (LEGUMINOSAE) Beryl B. Simpson and Emilio A. Ulibarri Integrative Biology and Plant Resources Center, The University of Texas, Austin, Texas 78712 USA Instituto de Botanica Darwinion, IBODA-CONICET, C.C. 22 (Labarden 200), Bl642HYD San Isidro, Argentina Abstract: The genus Hoffmannseggia Cav., now recognized as a monophyletic group distinct from Caesalpinia and Pomaria, consists of 22 species and is amphitropically distributed between North and South America, with 11 species in arid and semi-arid areas of the southwestern USA and adjacent Mexico, and 12 species in southern South America. Recent publications have provided a revision of Hoffmannseggia for North America, a resolved phylogeny, and an analysis of the biogeography of the genus, but there is to date no treatment of all of the taxa. Here we present a key to the genus and its closest relatives, a key to all of the recognized taxa, typification, distributional data for each species, selected specimens examined for the South American taxa, and notes where appropriate. Keywords: Caesalpinia, Caesalpinieae, Hoffmannseggia, Fabaceae, Leguminosae. Resumen: El genero Hoffmannseggia, actualmente reconocido como un grupo mo nofiletico distinto de Caesalpinia y Pomaria dentro de Caesalpinieae, consiste en 22 especies con distribuci6n anfitropical en zonas semi-aridas y aridas de Norte y Su damerica. De ellas, 11 especies se encuentran en el sudoeste de U. S. A. y norte de Mexico; las otras 12 en America del Sur, creciendo en las zonas andinas y semide serticas del Peru, Bolivia, Chile y Argentina. Recientes publicaciones por uno de los autores (B.
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