Chaetocalyx
''Chaetocalyx'' is a genus of lianas in the legume family, Fabaceae. It belongs to the subfamily Faboideae, and was recently assigned to the informal monophyletic ''Adesmia'' clade of the Dalbergieae. Members of this genus are found in Central and South America. ''Chaetocalyx'' can be distinguished from most other legumes by its climbing habit, its imparipinnate leaves, and, in most species, by its elongate loments. It can be distinguished from ''Nissolia'', which also has a climbing habit, by the articles of the loments, which are uniform in size in ''Chaetocalyx'', rather than with a terminal, expanded, winglike article as in ''Nissolia''. Unlike most papilionoid legumes, ''Chaetocalyx'' species do not form root nodule Root nodules are found on the roots of plants, primarily legumes, that form a symbiosis with nitrogen-fixing bacteria. Under nitrogen-limiting conditions, capable plants form a symbiotic relationship with a host-specific strain of bacteria known a ...s. Speci ...
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