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

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...

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Bibliographic Details
Published in:Novon (Saint Louis, Mo.) Mo.), 2009-09, Vol.19 (3), p.310-314
Main Authors: Egan, Ashley N., Reveal, James L.
Format: Article
Language:English
Subjects:
Fabaceae
IUCN Red List
Ladeania
Leguminosae
North America
Pediomelum
Psoraleeae
Psoralidium
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Summary: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.
ISSN:1055-3177
1945-6174
DOI:10.3417/2008074