by George F. Freytag  Daniel G. Debouck <br/><br/>
Taxonomy, distribution, and ecology of the Genus Phaseolus (Leguminosae-Papilionoideae) in North America, Mexico and Central America 

 -  Botanical Research Institute of Texas,  2002 
<br/><br/><label>Source: </label> 2005-03-17