The Vetches And Pea Vines (Vicia And Lathyrus) Of Texas

In technical keys, the genus Lathyrus . is characterized as having a squarely truncate stamen tube and styles hairy near the apex on the inner side only, while Vicia has an obliquely truncate stamen tube and styles hairy on the back or all around. These differences are neither well-marked nor easy to see, especially in most Texas species, which have very small flowers. For convenience the species of both genera are here treated together in a single key