Green's Bird's - Foot Trefoil. Lotus greenei, Papilionaceae Family also the Bean Family ( Fabaceae ) and Pea Family (Leguminosae), Green's Bird's - Foot Trefoil. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. Perennial Subshrub,Shrub, Forb/herb. Quick Notes: Height: About 6 - 16 inches. Spreading out to about 26 inches wide. Flowers: Older flowers are yellow color, in clusters of 1 - 3, younger flowers are tinged red or orange and a orange red backed banner petal. Flowering Time: April to June. Leaves: Leaves are pinnately compound, with 4 - 5 leaflets, each up to 1/4 inches long, grayish green. Found: Native throughout the American Southwest and the Sonoran deserts of Arizona and Mexico. Hardiness: USDA Zone 4a: to -34.4 �C (-30 �F) USDA Zone 4b: to -31.6 �C (-25 �F) USDA Zone 5a: to -28.8 �C (-20 �F) USDA Zone 5b: to -26.1 �C (-15 �F) USDA Zone 6a: to -23.3 �C (-10 �F) USDA Zone 6b: to -20.5 �C (-5 �F) USDA Zone 7a: to -17.7 �C (0 �F) USDA Zone 7b: to -14.9 �C (5 �F) 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) 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: 3,000 - 5,000 Feet. Habitat: On roadsides, flats, rocky hillsides. Arizona, New Mexico, Northern Sonora Mexico. Miscellaneous: Flowering Photos Taken May 11, 2009. Between Camp Verde & Payson, Arizona. General "George" Crook Trail.

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