KEY TO GENERA. 



PEA FAMILY. 



Family 60. FAB ACE AE Reichenb. Consp. 149. 

 PEA FAMILY. 



1828. 



Herbs, shrubs, vines or trees, with alternate mostly compound stipulate 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, the 

 teeth or lobes unequal or equal ; 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, some- 

 times 9, rarely 5. Pistil i, 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-manyj anatropous or amphitropous. Fruit a legume, I many- 

 seeded, dehiscent into 2 valves, or indehiscent, in one tribe a loment. Seeds mostly 

 without endosperm ; cotyledons thick. 



Genera about 325, species over 5000, most abundant in temperate and warm regions ; known 

 also as PAPILIONACEAE and PHASEOLACEAE, and included by some authors in the LEGUMINOSAE. 



* The 10 stamens distinct. 



Leaves pinnate. Tribe i. SOPHOREAE. 



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



** The stamens monadelphous 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 Glycyrrhisa, 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 (except in Orophaca). Tribe 7. GALEGEAE. 

 Foliage glandular-dotted ; pod indehiscent, i-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 herbs; leaves without tendrils. Tribe 10. PHASEOLEAE. 



Tribe i. SOPHOREAE. 



Our species herbs ; flowers racemed. 

 Trees ; flowers panicled. 



Tribe 2. PODALYRIEAE. 



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

 Ovary distinctly stipitate ; pod inflated. 



Tribe 3. GENISTEAE. 



Herbs, with simple or s-n-foliolate leaves. 

 Leaves simple ; pod inflated. 

 Leaves s-n-foliplate ; pod flattened. 

 Shrubs with i-3-foliolate leaves. 



Calyx divided into 2 lips ; leaves very prickly. 

 Calyx cleft into 2 lips to about the middle. 

 Calyx-teeth long. 

 Calyx-teeth short 



Tribe 4. TRIFOLIEAE. 



Flowers spiked, or capitate ; pods curved, or coiled. 



Flowers in long racemes ; pods coriaceous. 



Flowers capitate or umbelled ; pods straight, membranous. 



Tribe 5. LOTEAE. 



Filaments diadelphous ; pods dehiscent. 



Leaves s-foliolate. 



Leaves pinnate ; leaflets sometimes only i or 3. 

 Filaments monadelphous ; pods indehiscent or nearly so. 



Tribe 6. PSORALEAE. 



Leaves digitately 3-5-foliolate, or pinnately 3-foliolate. 

 Leaves pinnately 5-many-foliolate. 



Stamens 10 or 9, monadelphous. at least at the base. 

 Corolla of only i petal (the standard). 



Corolla of 5 petals, the wings and keel united to the filament-tube. 

 Stamens only 5, monadelphous. 



Tribe 7. GALEGEAE. 



Standard very broad, ovate or orbicular. 

 Herbs ; leaves odd-pinnate. 



Pod 4-angled in our species. 

 Pod flat. 



1. Sophora. 



2. Cladrastis. 



3. Thermopsis. 



4. Baptisia. 



5. Crotalaria. 



6. Lupinus. 



7. Ulex. 



8. Genista. 

 g. Cytisus. 



10. Medic ago. 

 n. Melilotus. 

 12. Trifolium, 



13. Lotus. 



14. Hosackia. 



15. Anthyllis. 



1 6. Psoralea. 



17. Amorpha. 



1 8. Parosela. 



19. Petalostemum. 



20. Indigofera. 



21. Cracca. 



