Hairy Lotus. Lotus rigidus, Papilionaceae Family also the Bean Family ( Fabaceae ) and Pea Family (Leguminosae), Hairy Lotus. Also called shrubby deervetch, desert deerweed, or desert rock pea. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. Lotus rigidus, is a perennial herbaceous plant growing to 36 inches tall. The leaves are irregularly pinnate or palmate with 3-5 leaflets, up to 1 inch long. The flowers are yellow, turning red or purple as they age. Quick Notes: Height: About 36 inches. Spreading out to about 40 inches wide. Flowers: Yellow color, in clusters of 1 - 3, tinged red or orange and a red-backed banner petal. Flowering Time: March to April. Leaves: Leaves are pinnately compound, with 3 - 5 leaflets, each up to 1 inches long, green. Found: Native to the Mojave & Sonora Deserts in the Southwestern United States and northwest Mexico. Hardiness: USDA Zone 8a: to -12.2 �C (10 �F) USDA Zone 8b: to -9.4 �C (15 �F) USDA Zone 9a: to -6.6 �C (20 �F) USDA Zone 9b: to -3.8 �C (25 �F) USDA Zone 10a: to -1.1 �C (30 �F) USDA Zone 10b: to 1.7 �C (35 �F) Soil pH requirements: 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) 7.9 to 8.5 (alkaline) 8.6 to 9.0 (strongly alkaline) Sun Exposure: Full Sun Elevation: 0 - 4,800 Feet. Habitat: On cultivated, waste and fallow land, roadsides, yards, and other disturbed areas. Dry flats and slopes. In cities and towns also. Miscellaneous: Flowering Photos Taken March 16, 2009. Horseshoe Lake, Arizona.

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