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Range: northeastern Oregon, Idaho, and Colorado, to the central Sierra Nevada of California. Additional info: the plant contains alkaloids poisonous to livestock, particularly sheep, since cattle rarely graze where it grows. The pods of this and other species have elastic walls which—when touched—instantly curl back and explosively eject seeds.

Range: western Texas to southeastern California; northern Mexico.

Range: throughout. Additional info: as with most Vetches, this is a native of Europe. Another similar species with racemes of many lavender to purple flowers is Hairy Vetch (V. villosa), which differs by having longer hairs.

Range: throughout. Additional info: with showy flowers unusually large for the genus, it resembles many species of Lathryus, but can be distinguished by the distribution of the hairs at the tip of the style.

Range: throughout. Additional info: one of the most perplexing groups of plants, with many, often intergrading, variants named as species.

Range: western Washington to central California near the Pacific coast.

Range: central California south to Baja California. Additional info: the corolla remains on the plant long after it dries, a tissue paper-like bell that rustles in gentle breezes.

Range: eastern Washington to Southern California and northern Arizona; east to western Montana.

Range: southern British Columbia; south through eastern Washington and Oregon to central California; east to western Colorado, northern Utah, Idaho, and Alberta.

Range: southern British Columbia to Northern California; east to New Mexico, southeastern Utah, southern Wyoming, and central Idaho.

Range: southeastern California to southwestern Utah, central Arizona, and northwestern Mexico.

Range: central Oregon to Southern California.

Range: Southern California. Additional info: in a spring following a wet winter, thousands of these plants will bloom, forming masses of deep, rich blue.

Range: Northern California to Baja California; east to southern Nevada and eastern Arizona.

Range: southern British Columbia to Northern California; east to western Nebraska, Colorado, and Alberta.

Range: southern Utah to western Oklahoma; south to western Texas, New Mexico, Arizona, and northern Mexico.

Range: southern British Columbia to Northern California; east across much of Utah and Idaho to western Wyoming.

Range: southern British Columbia to northeastern California; east to Alberta; south in the mountains to Colorado.

Range: British Columbia to Baja California; east to Montana.

Range: in the West especially common from California to western Washington.