The flowers of the Alpine Clover have a cream-white standard and rose-purple wings and keel. They are clustered in heads on stemless plants which form mats or cushions 4-20 in. across and grow only on alpine peaks at 12000-14000 ft. They bloom in midsummer. The name “Clover” comes from the Latin word meaning “club” and refers to the resemblance between the leaf and the 3-headed club of Hercules. The clubs of playing-cards are also no doubt an imitation of the cloverleaf. The 3-parted leaves of the clovers fold together and “sleep” at night. The cultivated clovers are valuable as fodder and the white-flowered species makes beautiful lawns. Psoralea Psoralea tenuiflora Plate 28, fig. 4 Psoralea bears its small blue to purplish flowers in open spikes on branching plants 1-4 ft. tall. They bloom in early summer and are found on dry plains and hills at 4000-8000 ft. Some species of this genus are used in medicine and one, _Psoralea esculenta_, has a tuberous root that is edible. Dwarf Clover Trifolium nanum Plate 28, fig. 5 The pink to rose-purple flowers of the Dwarf Clover occur usually in pairs on prostrate or spreading stems in the high mountains. They bloom in midsummer and are found only at 9000-14000 ft. The Latin name for the genus means “three-leaves,” and the 3-parted leaf is characteristic of practically all clovers. Prairie Pea Astragalus hypoglottis Plate 28, fig. 6 The flowers of the Prairie Pea are usually blue to purple, rarely whitish or yellowish. They occur in dense heads on procumbent or ascending stems 4-8 in. long and bloom in midsummer. The plants are found in meadows and river valleys at 4000-9000 ft. Rose Locust Robinia neo-mexicana Plate 28, fig. 7 The Rose Locust is a shrub or tree 3-15 ft. tall, which grows along streams at 4000-7000 ft. The flowers are white to rose-colored with a touch of yellow on the standard and keel, and their large showy clusters come into bloom in spring and early summer. It is the handsomest of the locusts, and should be cultivated wherever winters are not too severe. STONECROP FAMILY Rose Crown Clementsia rhodantha Plate 30, fig. 1 The rose-pink to nearly white flowers of the Rose Crown are crowded into heads at the ends of stiff stems 4-20 in. tall. They bloom in midsummer and may be found in meadows and bogs and along streams at high altitudes, 10000-13000 ft. King’s Crown, Roseroot Rhodiola Rosea Plate 30, fig. 3