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Smooth Vetch is very similar in appearance to Vicia villosa (Hairy Vetch), and some authorities consider it to be a variety of the latter species. The stems and leaf stalks of Smooth Vetch are hairless or sparsely hairy; in the latter case, these hairs are very short, fine, and appressed against the stems or stalks. In contrast, Hairy Vetch has long spreading hairs on its stems and leaf stalks. Another difference, in my experience, is the color of their flowers