Background: Centrosema (Fabaceae) includes 35-44 species in the New World, 10 Mexico, and 9 Yucatan Peninsula. Most have trifoliolate leaves bicolored flowers. Unifoliolate are an infrequent character that is found a few species, e.g., C. sagittatum (Humb. & Bonpl. ex Willd.) Brandegee, but monochromatic flowers, e.g, lacking nectar guides, even more unusual state. Several populations of fr...

Enzyme electrophoresis and rRNA sequencing indicated that root nodule bacteria from the canopy tree Platypodium elegans and the lianas Machaerium milleflorum and Machaerium arboreum on Barro Colorado Island, Panama, were highly diverse on a local scale. A total of 11 distinct multilocus genotypes [ETs (electrophoretic types)] was found among the 33 isolates analysed. On average, ETs differed fr...