214 LEGUMINOSAE. 



Hill Blopes: Coast Ranges (San Francisco, Napa Range and northward); 

 Sierra Nevada. 



LEGUMINOSAE. Pea Family. 



Herbs, shrubs, or trees with alternate stipulate leaves, in ours compound 

 (except in Cercis). Leaflets 1 to many, usually entire. Calyx synsepalous, 

 5-toothed or -cleft (or in Lupinus bilabiate), mostly persistent. Corolla with 

 5 petals, in nearly all of ours papilionaceous, i. e., highly irregular and butter- 

 fly-like: the upper petal is called the banner; the lateral petals are called the 

 wings; the two lower petals are joined by their edges to form the keel; the 

 banner in the bud enfolds the wings which in turn cover the keel-petals; all 

 the claws are free from one another. Petals essentially hypogynous in ours. 

 Stamens 10, united into a sheath around the ovary (monadelphous), or the upper 

 stamen distinct from the others (diadelphous), or sometimes all distinct. 

 Pistil 1, superior, 1-celled. Fruit a legume (2-valved pod), with 1 row of 

 seeds on the ventral side, commonly opening by both the dorsal and ventral 

 sutures, the valves twisting in opposite directions, or sometimes indehiscent. 

 Seeds mostly kidney-shaped, without endosperm. The corolla of Cercis is nearly 

 regular. Amorpha has but one petal. The exceptions to the ordinal diagnosis 

 are many but only those which concern our flora are here noted. This is one 

 of the largest of the natural orders, many species yielding important products. 



A. Leaves simple. 



Corolla obscurely papilionaceous, slightly irregular; shrubs 1. Cercis. 



B. Leaves compound ; corolla papilionaceous (except no. 6). 

 1. Stamens distinct; leaves palmatcly 3-foliolatc. 



Flowers yellow, in racemes; stipules conspicuous; herbs 2. Thermopsis. 



Flowers purple, solitary; stipules none; very spiny shrub 3. Pickeringia. 



2. Stamens diadelphous or monadelphous. 



a. Calyx deeply bilabiate. 



Stamens 5 long and 5 short, their filaments monadelphous but free at apex; flowers 



racemose, mostly in whorls; leaves palmate, of 4 to many leaflets 4. Lupinus. 



b. Calyx 5-toothed. 

 Leaves 3-foliolate, the leaflets denticulate or serrulate. (See also no. 10.) 



Flowers in a raceme or spike; corolla deciduous after flowering; leaves pinnately 3- 

 foliolate. 



Pod curved or spirally coiled; style subulate 5. Medicago. 



Pod small, globose; style filiform 6. Melilotus. 



Flowers in a head or head-like inflorescence, rarely in a capitate umbel or short spike; 

 corolla withering-persistent after flowering; leaves palmately 3, sometimes 4 or 5- 



foliolate 7. Trifolium. 



Leaves unequally or odd pinnate (one palmate in no. 10), the leaflets entire. 



Flowers in umbels, sometimes solitary; leaflets commonly 3 to many, sometimes 1 or 2 



8. Lotus. 

 Flowers in racemes or spikes; leaflets many (3 or 5 in no. 10.) 

 Herbage glutinous or glandular-dotted. 



Pod not prickly; flowers purple or whitish. 



Shrub; corolla of 1 petal 9. Amorpha. 



Herb; corolla of 5 petals 10. Psoralea. 



Pod prickly, indehiscent; flowers yellowish 11. Glycyrrhiza. 



Herbage not glandular; pod usually inflated or turgid 12. Astragalus. 



Leaves equally pinnate, the rachis produced into a branched tendril, rarely terminating in 

 a bristle or imperfect leaflet; flowers in spikes or racemes. 



Style hairy all around at summit 13. Yicta. 



Style hairy on the upper side 14. Lathyrus! 



1. CERCIS L. Judas Tree. 

 shnil. s. Flowers red purple, in umbel like fascicles, appearing from winter 

 buds in advance of the Bimple Leaves. Stipules caducous. Calyx in anthesis 

 broadex than long, with 5 broad obtuse teeth. Corolla obscurly papilionaceous; 



