LEGUMINOS^E. (PULSE FAMILY.) 125 



Tribe VI. PHASEOLE^. Twining or sometimes only trailing plants (herbs in tem- 

 perate regions), with pinnately 3- (rarely 1- or 5-7-) foliolate leaves, commonly stipellate. 

 Peduncles or flowers axillary ; the pedicels usually clustered on the thickened nodes of 

 the raceme. Anthers uniform. Pod continuous, not jointed, nor more than 1-celled, except 

 by cellular matter sometimes deposited between the seeds, 2-valved. Cotyledons thick, and 

 rising above ground little changed in germination, or sometimes becoming foliaceous. 

 # Leaves pinnate. 



12. Wistaria. Woody twiner : leaflets 9-13 Keel barely incurved, obtuse. 



24. Apios. Herbaceous twiuer : leaflets 5 -7. Keel slender and much incurved or coiled. 



* * Leaves 3-foliolate. Ovules and seeds several. Flowers not yellow. 



25. Phnseolus. Keel strongly incurved or coiled : standard recurved-spreading. Style 



bearded lengthwise. 



26. Centrosema. Calyx short, 5-cleft. Standard with a spur at the base: keel broad, 



merely incurved. Style minutely bearded next the stigma. 



27. Clitoria. Calyx tubular, 5-lobed. Standard erect, spurless : keel scythe-shaped. Style 



bearded down the inner face. 

 28 Amphicarpsea. Calyx tubular, 4 - 5-toothed. Standard erect : keel almost straight. 

 Style beardless. Some nearly apetalous fertile flowers next the ground. 



29. Galactia. Calyx 4-cleft, the upper lobe broadest and entire. Style beardless. Bract 



and bractlets minute, mostly deciduous. 



* # * Leaves 1 - 3-foliolate. Ovules and seeds only one or two. Flowers yellow. 



30. Rhynchosia. Keel scythe-shaped. Calyx 4 - 5-parted. Pod short. 



B. Stamens all separate. 



Tribe VII. SOPfiOREJl and PODALYRIEJJ. Stamens 10, distinct ; the co- 

 rolla being truly papilionaceous. 



31. Baptisia. Calyx 4 -5-lobed. Pod inflated. Herbs : leaves palmately 3-foliolate or simple. 



32. Cladrastis. Calyx 5-toothed. Pod very flat. Tree, with pinnate leaves. 



Suborder II. CESALPINIEiE. Brasiletto Family. 



Corolla imperfectly or not at all papilionaceous, sometimes nearly regu- 

 lar, imbricated in the bud, the upper or odd petal inside and enclosed 

 by the others. Stamens 10 or fewer, commonly distinct, inserted on the 

 calyx. Seeds anatropous, often with albumen. Embryo straight. 



* Flowers imperfectly papilionaceous, perfect. 



33. Cercis. Calyx campanulate, 5-toothed. Pod flat, wing-margined. Leaves simple. 



# * Flowers not at all papilionaceous, perfect. 



%i. Cassia. Calyx of 5 nearly distinct sepals. Leaves simply and abruptly pinnate. 

 * * * Flowers not at all papilionaceors, polygamous or dioecious. 



v»5. Gymnocladus. Tree: leaves all doubly pinnate Calyx-tube elongated, at its sum- 

 mit bearing 5 petals resembling the calyx-lobes. Stamens 10. 



36 Gleditschia. Trees thorny, leaves simply and doubly pinnate. Calyx-tube short; 

 its lubes, petals, and stamens 3-5. 



Suborder III. MIMOSEiE. Mimosa Family. 



Flower regular. Corolla valvate in aestivation, often united into a 

 4 - 5-lobed cup, hypogynous, as are the (often very numerous) exserted 

 stamens. Embryo straight. Leaves twice pinnate. 



37. Desman til us. Petals distinct. Stamens 5 or 10 Pod smooth. 

 88. Sch.rank.ia. Petals united below into a cup. Stamens 8 or 10. Pod covered with 

 small prickles or rough projections. 



