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Phaseolus

1. Raceme many-flowered, slender, elongate at maturity, exceeding the subtending petiole (or even the entire leaf); pedicels much longer than the tiny bractlets (less than 1 mm) at base of calyx.

P. polystachios

1. Raceme few-flowered, scarcely if at all exceeding the subtending petiole; pedicels shorter than the pair of large bractlets which subtend and conceal the calyx at anthesis.

P. vulgaris

All species found in Phaseolus

Phaseolus polystachiosWILD BEAN 
Phaseolus vulgarisGREEN BEAN, STRING BEAN, SNAP BEAN, KIDNEY BEAN, WAX BEAN, COMMON BEAN 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. June 27, 2017. http://michiganflora.net/genus.aspx?id=Phaseolus.