42 CAE3ALPINACEAE 



AMPHICAf^PAEA Ell. Trailing perennials from ovate tubers, with pin- 

 nately 3- foliate long-petioled leaves, and perfect flowers in axillary racemes 

 or solitary apetalous ones in the lower axils or on slender creeping 1 branches. 

 Calyx 4-5-cleft; bracts minute or none. Standard obovate, enfolding the oth- 

 er petals; keel and wings straightish, similar Stamens diadelphous, 9 and 1. 

 Style beardless. Pods of the upper flowers, flat, recurved, short-stalked, 2-3- 

 seeded: those of the lower flowers underground, fleshy, globose, 1-seeded. 



A. monoica Nutt. Pubescent or glabrate; leaflets ovate, thin, }i~2 inches 

 long; stipules small, ovate; racemes nodding, purple; calyx short; pod an inch 

 long. M inch wide, hairy on the margin. Rich woodlands; August-September; 

 frequent. {FaJoaUx ccmitsaiL. ) Ivuntze.) 



A. pitcheri T. & (i. Villous-brown-pubescent; leaflets 2-4 inches long; 

 pods of the large flowers frequent, pubescent, subterranean pods infrequent. 

 Rich woodlands; August-September; frequent. ( F. pitcheri ( T. & G. ) Kuntze. ) 



CAESALPINACK1AE A7. & Garcke. Senna Family. 

 Trees, shrubs or herbs, with alternate simple or compound leaves, and 

 regular or irregular monoecious, dioecious or polygamous flowers. Calyx 

 mostly 5-toothed or 5-parted. Petals 5, the upper enclosed by the lateral 

 in the bud. Stamens 10 or fewer; filaments distinct or somewhat united. 

 Fruit a legume, dehiscent into two valves. 



Cercis. Trees, with simpie leaves, perfect roseate apparently papilionaceous flowers, 

 and flat wing -margined pods. 



CASSIA. Herbs, with pinnate leaves, and nearly regular perfect flowers. 



Gymnocladus. Trees, with blpiuaate leaves, and regular polygamous or dioecious flow- 

 ers. Stamens 10. 



Gleditschia. Thoray trees, with 1-2 pinnate leaves, and greenish polygamous flowers. 

 Sepals, petals, and stamens 3-5. 



CERCIS L. Leaves large, ovate-cordate. Flowers reddish-purple, cluster- 

 ed, appearing- before the leaves, on old branches. Calyx persistent, 5-toothed. 

 Corolla imperfectly papilionaceous; wings larger than the standard and envel- 

 oping it; lower petals large, free. Pods 2-3 inches long, H~H inch wide, 

 wing-margined on the upper sucture. 



C. canadensis L. Leaves pointed, entire, petioles somewhat shorter than 

 the leaves; pods flat, many-seeded, veiny, nearly sessile. A small tree fre- 

 quent along water courses, preferring the bluffs; April-May; Scott, Musca- 

 tine, Louisa, Des Moines, Lee, Henry, Van Buren, Jefferson, Johnson, Appa- 

 noose, Polk, Decatur, and Fremont counties. 



CASSIA L. Herbs, with abruptly pinnate leaves, and mostly yellow flow- 

 ers. Sepals 5, nearly equal, scarcely united at the base. Petals 5, unequal, 

 but not papilionaceous, spreading. Stamens normally 10, sometimes fewer 

 by abortion, often unequal; anthers opening by two terminal pores. Pods 

 flat, 1 -eel led, many-seeded. 



C. chamaecrista L. PartrUfyje Pea. Annual, stem 1 foot high, much branch- 

 ed: leaflets 10-1.") pairs, oblique at the base, sessile or nearly so, linear-ob- 

 long, obtuse, mucronate, a cup shaped gland situated on the petiole below the 

 first pair of leaflets; stipules lanceolate, striate, persistent; flowers large, on 

 slender pedicels: 3 or 3 of the petals with a purple spot at the base; anthers 

 10, unequal, elongated < I yellow. (5 purple. Sandy soil, fields and waste 

 places: July-August; common. 



C. mcrylandica L. Wild Senna. Perennial, stem 3-4 feet high; leaflets 

 (■)-".» pairs, short-stalked, oblong -lanceolate, obtuse, mucronate, a club-shaped 



