CASSIACEAE. 159 



Leaves with 1-pinnate blades : flowers perfect : petals yellow 



or whitish, unequal. 



Calyx-lobes obtuse : pods tardily dehiscent or indehiscent. 2. CASSIA. 

 Calyx-lobes acuminate : pods elastically dehiscent. 3. CHAMAECRISTA. 



Leaves with 2-pinnate blades : flowers polygamous : petals 



greenish, nearly equal. 4. GLEDITSIA. 



1. CERCIS L. Shrubs or trees. Leaves 1-foliolate: leaflet broad. Calyx 

 shallowly lobed: tube gibbous. Corolla pink-purple: keel-petals of the ap- 

 parently papilionaceous corolla longer than the others. Anthers short, opening 

 lengthwise. Pod very flat. 



1. C. canadensis L. Shrub or tree: leaf -blades broadly ovate to reniform: 

 pedicels mostly less than 1.5, cm. long: sinuses of the calyx nearly as broad 

 as the lobes: larger petals 12-13 mm. long; blades ovate: pods linear-oblong, 

 5-10 ' cm. long. Common, on rocky hills. Spr. RED-BUD. JUDAS-TREE. 



2. CASSIA [Tourn.] L. Herbs, shrubs, or trees. Leaves abruptly 1- 

 pinnate: stipules deciduous. Flowers in axillary racemes or panicles. Sepals 

 nearly distinct, leathery or petaloid. Petals mainly yellow or whitish. Pod 

 more or less turgid, indehiscent or rather tardily dehiscent. SENNA. 



1. C. marylandica L. Perennial, 8-20 dm. tall, sparingly pubescent: leaflets 

 12-20'; blades elliptic to oblong, mucromate, 4-5 cm. long: petiolar gland 

 obconical, stipitate, near the base of the rachis: sepals 6-8 mm. long: petals 

 10-12 mm. long, cuneate to spatulate: pods curved, somewhat hispid, 10-12 

 cm. long : seeds flat, nearly as wide as long. Common, in moist grounds, 

 especially near streams. Sum. WILD-SENNA. 



3. CHAMAECRISTA Moench. Herbs or shrubs. Leaves abruptly 1- 

 pinnate: stipules persistent. Flowers clustered in leaf -axils. Sepals nearly 

 distinct, membranous. Petals mainly yellow or whitish. Pod flattish, promptly 

 dehiscent, the valves elastic. Sum. SENSITIVE-PEA. SENSITIVE-PLANT. 



Corolla small, less than 1 cm. wide : anthers 5.. nearly equal. 1. C. nictitans. 



Corolla large, over 1 cm. wide : anthers 10, very unequal. 2. C f . fasciculata 



1. C. nictitans (L.) Moench. Stem branching and spreading freely, finely 

 pubescent: leaflets 12-28; blades glabrous, linear to linear-elliptic, acute or 

 mucronate, 10-14 mm. long or less: petiolar gland urceolate, subsessile: 

 stipules lanceolate: sepals 5-7 mm. long, sparingly pubescent: standard obo- 

 vate, sometimes broadly so, smaller than the large wing-petal: pods pubes- 

 cent, 2.5-3.5 cm. long, 6 mm. wide. Common, in dry soil. WILD SENSITIVE- 

 PLANT. 



2. C. fasciculata (Michx.) Greene. Stem erect or spreading, finely pubescent: 

 leaflets 16-28; blades oblong-elliptic, acute or mucronate, 1.5 cm. long or less: 

 petiolar gland sessile, compressed, truncate: stipules lanceolate-linear: sepals 

 12-17 mm. long, short-hairy: standard 13-20 mm. long: pods pubescent, 4-5 

 cm. long, 5 mm. wide. Common, in dry soil. PARTRIDGE-PEA. 



4. GLEDITSIA L. Trees with simple or branched thorns. Leaves rela- 

 tively small, 2-pinnate: stipules present. Calyx-lobes obtuse, about as long as 

 the petals. Petals nearly equal. Pod flat. 



1. G. triacanthos L. Tree becoming 40 m. tall: leaflets 1-2.5 cm. long; blades 

 ovate-lanceolate varying to elliptic: sepals narrowly oblong to lanceolate: 

 pods black and lustrous, pulpy within. S. Eather common, in thickets. 

 Schists. Late spr. HONEY-LOCUST. 



