PEA FAMILY 135 



LEGUMINOSAE. Pea Family. 

 Herbs and shrubs, ours with alternate compound leaves 

 with stipules. Calyx 5-toothed or in Lupinus 2-lipped. Cor- 

 olla of 5 petals, irregular and butterfly-like; the upper petal 

 is the banner, the lateral petals are the wings, the 2 lowest 

 petals unite by their edges to form the keel. Stamens 10, 

 united into a sheath around the ovary, or 1 of them free. 

 Pistil 1, maturing into a 1-celled several-seeded pod. 

 A. Flowers in racemes. 



Leaflets 3 ; flowers small, yellow 2. Medicago. 



Leaflets more than 3. 



Leaves palmate, the leaflets all from the summit of the 



petiole 1. Lupinus. 



Leaves pinnate, the leaflets arranged along the sides of 

 the common axis. 



Leaves not tendril-bearing 5. Astragalus. 



Leaves ending in slender tendrils. 



Style hairy all around the summit 6. Vicia. 



Style hairy on the upper side only 7. Lathyrus. 



B. Flowers in heads or in umbels or solitary. 



Leaves palmately compound, the 3 leaflets all from the sum- 

 mit of the petiole 3. Trifolium. 



Leaves pinnately compound 4. Hosackia. 



Cercis occidentalis Torr., the Western Red-bud or Judas 

 Tree, grows in the foothill canons below our borders. It is 

 a shrub with reddish flowers appearing in spring before the 

 simple, rounded leaves. 



1. LUPINUS. Lupine. 



Herbs and low shrubs with palmately compound leaves of 



more than 3 leaflets. Flowers showy, in terminal racemes or 



spikes. Calyx 2-lipped. Pod oblong, flattened, 2 to 12-seeded. 



A. Annuals. 



Flowers Y% in. or less long, purplish and white 1. L. micranthns. 



Flowers over x / 2 in. long, pink and yellow 2. L. stiver six. 



B. Perennials. 



Leaflets mostly \Vi in. or more long. 



Leaves green and nearly glabrous 3. L. longipes. 



Leaves pale, long-hairy 4. L. covillei. 



Leaflets under \y 2 in. or rarely 2 in. long. 

 Flowers Yi in. or more long. 

 Keel hairy on the inner edge. 



Banner glabrous; pubescence slightly spreading.. 5. L. grayi. 

 Banner hairy on back; foliage silvery-pubescent.. 6. L. ornatus. 

 Keel entirely without hairs 7. L. formosus. 



