Key to Genera. 



PEA FAMILY. 



341 



Family 60. FABACEAE Reichcnb. Consp. 149. 1828. 

 Pb:.\ Family. 

 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, diadclphous, or sometimes separate, 10 in most of the genera, some- 

 times 9, rarely 5. Pistil i, simple, superior; ovary mainly i-cellcd, 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, 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 Papihonaceae 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 Glycyrrliica. which has many-seeded pods) 



Stamens monadelphotis ; anthers of 2 kinds. 

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

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

 Leaflets denticulate. 

 Leaflets entire. 

 Leaves pinnately several-many-foliolate (except in Orophaca) 

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

 Pod a loment ; herbs. 

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

 Vines, ours herbaceous, or herbs ; leaves without tendrils. 



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 5-1 i-foliolate leaves. 

 Leaves simple ; pod inflated. 

 Leaves 5-1 i-foliolate ; pod flattened. 

 Shrubs with 1-3-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 5-foliolate. 



Leaves pinnate ; leaflets sometimes only i or 3. 

 Filaments monadelphous : pods indehiscent or nearly so. 



Tribe 6. Psor,\leae. 



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. 



Tribe 3. Genisteae; 



Indigofera. 

 Cracca. 



