A New Combination in Pediomelum and a New Genus, Ladeania, from Western North America (Fabaceae, Psoraleeae)

• Ashley N. Egan ^[1] ; James L. Reveal ^[1]
  1. [1] Cornell University

     Cornell University

     City of Ithaca, Estados Unidos

     
• Localización: Novon: a journal for botanical nomenclature, ISSN 1055-3177, Vol. 19, Nº. 3, 2009, págs. 310-314
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Psoralidium tenuiflorum (Pursh) Rydberg, the type of Psoralidium Rydberg, is transferred to Pediomelum Rydberg requiring a new combination, Pediomelum tenuiflorum (Pursh) A. N. Egan in tribe Psoraleeae Lowe (Fabaceae/Leguminosae). Previously published evidence on phylogenetic relationships provides a foundation for this combination, as do shared morphological traits such as persistent bracts and an elliptical fruit that falls with the calyx. A new genus, Ladeania A. N. Egan & Reveal, is described to accommodate the two remaining species previously in Psoralidium: L. juncea (Eastwood) A. N. Egan & Reveal and L. lanceolata (Pursh) A. N. Egan & Reveal, with the latter designated as the type. Ladeania is distinguished by readily deciduous bracts accompanying a calyx that does not enlarge or elongate in fruit, but flares back from the receptacle. A lectotype is designated for Psoralea floribunda Nuttall ex Torrey & A. Gray.