53 2 FLORA. 



flower; flowers about 2.5 cm. broad, the sepals purple within, pubescent without; 

 claws of the 3 upper petals united; stamens 4; fruit globose, pubescent, very spiny, 

 about 1.2 cm. in diameter. Fla. to Kans., N, Mex. and Mex. April-June. 



Family 17. PAPILIONACEAE L. 



Pea Family. 



Herbs, shrubs, vines or trees, with alternate mostly compound stipu- 

 late leaves, and irregular (papilionaceous) perfect or sometimes polygamo- 

 dioecious flowers, mainly in spikes, heads, racemes or panicles. Calyx 

 4-5-toothed, or 4-5-cleft, sometimes 2-lipped. Petals more or less 

 united, or separate, perigynous or hypogynous, usually consisting of a 

 broad upper one (standard, banner), two lateral ones (wings), and two 

 front ones more or less united (forming the keel) ; the standard encloses 

 the wings in the bud. Stamens monadelphous, diadelphous, or sometimes 

 separate, 10 in most of the genera, sometimes 9, rarely 5. Pistil simple, 

 superior ; ovary mainly i-celled, sometimes 2-celled by the intrusion of the 

 sutures, or several-celled by cross-partitions ; style simple ; ovules i-many, 

 anatropous or amphitropous. Fruit a legume, 1 -many-seeded, dehiscent 

 into 2 valves, or indehiscent, in one tribe a loment. Seeds mostly with- 

 out endosperm ; cotyledons thick. About 320 genera and 5000 species, 

 most abundant in temperate and warm regions. 



* The 10 stamens distinct. 

 Leaves pinnate. Tribe 1. Sophoreae. 



Leaves digitate (in ours 3-foliolate), or simple. Tribe 2. Podalyrieae. 



* * The stamens monadelphons or diadelphous. 

 Herbs, shrubs, woody vines or trees, the leaves not tendril-bearing. 

 Pod not a loment, 2-valved or indehiscent. 



Foliage not glandular-dotted (except in G/ycyrr/iiza, which has many-seeded 

 pods). 



Stamens monadelphous ; anthers of 2 kinds. Tribe 3. Genisteae. 



Stamens diadelphous (except in Ononis) ; anthers all alike. 

 Leaves, in our species, 3-foliolate, rarely i-foliolate. 



Leaflets denticulate. Tribe 4. Trifolieae. 



Leaflets entire. Tribe 5. Loteae. 



Leaves pinnately several-many-foliolate (3-foliolate in Orophaca), very 

 rarely i-foliolate. Tribe 7. Galegeae. 



Foliage glandular-dotted ; pod indehiscent, 1-2-seeded ; herbs. 



Tribe 6. Psoraleae. 

 Pod a loment ; herbs. Tribe 8. Hedysareae. 



Herbaceous vines, or herbs ; leaves evenly pinnate, with tendrils. 



Tribe 9. Vicieae. 

 Vines, ours herbaceous, or erect herbs ; leaves odd-pinnate, mostly 3-foliolate, without 

 tendrils. Tribe 10. Phaseoleae. 



Tribe 1. Sophoreae. 



Our species herbs ; flowers racemed. 1. Sophora. 



Trees ; flowers panicled. 2. Cladrastis. 



Tribe 2. Podalyrieae. 



Ovary sessile, or nearly so; pod flat in our species. 3. Thermopsis. 



Ovary distinctly stipitate; pod inflated. 4. Baptisia. 



Tribe 3. Genisteae. 



Herbs, with simple or 5-11-foliolate leaves. 



Leaves simple: pod inflated. g % Crotalaria. 



Leaves 5-11-foliolate; pod flattened. 6. Lupinus. 



Shrubs, with 1 -3-foliolate leaves. 



Calyx divided into 9 lips ; leaves very prickly. 7. Ulex. 



Calyx cleft into 2 lips to about the middle. 



Calyx-teeth long. 8. Genista. 



Calyx-teeth short, 9. Cylims, 



