This section is from the book "Field Book Of Western Wild Flowers", by Margaret Armstrong. Also available from Amazon: Field Book Of Western Wild Flowers.
A very slender plant, with trailing stems, one or two feet long, the leaflets odd in number and downy on the under side. The flowers are about half an inch long, with a whitish, downy calyx and a bright purple corolla, shading to white at the base. This grows in mountain canyons and looks a good deal like a Vetch, except that it has no tendrils.
 
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