26 
ARTIFICIAL KEY TO THE NORTH AMERICAN SPECIES. 
Flowers few or crowded in oblong panicles or racemes at the summit of the simple or 
branched stems (somewhat elongated and spicate in C. devocarpa). 
Leaflets linear-oblong or elliptical, panicles sessile or short-peduncled. 
Stems erect, simple ; pubescence on the sessile, crowded panicle silvery ; legume 
cinéreous—pubescent-or villous . 2... ee a 1. C. Virginiana, 
Stems erect, branching ; pubescence on the sessile or short-peduncled, crowded 
panicle tawny; legume rusty or tawny, villous or tomentose. . 2. C. eucantha. 
Stem erect, sub-simple or branching; pubescence on the short-peduncled pani- 
cle appressed-cinereous; legume yellowish, glabrous. . . 3. C. dedocarpa. 
Leaflets obovate or sub-orbicular; panicles long-peduncled. 
Stems prostrate or ascending; legume yellowish, velvety pubescent. 
4. C. Lindheimeri. 
Flowers fascicled or more or less remote, forming a somewhat spicate long-peduncled 
inflorescence. 
Stems erect, pilose with mostly spreading rusty hairs; leaflets g-25 cuneate- 
EE OT  ae  Seae  A Surtees Kee TS PRL Ae 5. C. onobrychotdes. 
Stems decumbent or ascending, pilose with reflexed or spreading rusty hairs; 
leaflets 5-15, oval or oblong, or in the variety linear-oblong. , . 6. C. spicata. 
Flowers scattered, single or geminate, forming a slender, elongated, spicate inflor- 
escence, much exceeding the leaves. . . . ......2...-- 7. C, purpurea. 
Flowers single or geminate, scattered at the summit of slender ancipital peduncles, 
mostly exceeding the leaves (often shorter in C. ambigua); flowers white, turning 
reddish or purple. 
Petioles much longer than the leaflets. 
Stems erect, very slender, flexnous ; leaflets linear. . . 8. C. angustissima. 
Stems trailing or assurgent; peduncles and leaves erect; leaflets oblong or 
CHECALCODION DY oi5 475 es Soe i Re ee 9. C. ambigua. 
Petioles the length of or shorter than the leaflets (leaves sessile or nearly so in 
C. chrysophylle). 
Stems decumbent or assurgent, slender; leaflets mostly acute at each end, 
POHEKOCL Oe ee es re 10. C. hispidula. 
Stems assurgent, leaflets oblong-obovate. 11. C. Smallit. 
Stems prostrate, spreading. 
Leaflets 1-7 cuneate-obovate, silky-hirsute beneath. 
12. C. chrysophylla. 
Ne Me aes LR ae SAT ae kee he pe A eS tae “glee Aa eg 
PE Bee ee SE 
strigose and somewhat glaucous beneath, the terminal one usually considerably 
_ larger than the lateral ones; racemes 1 dm. or less long; flowers few, 6 or 7 mm. 
__ long, scattered along the slender ancipital peduncle; bracts minute, setaceous ; calyx- 
_ teeth setaceous, as long as the tube; corolla rosé-purple; vexillum minutely hirsute ; 
legume 3-5 cm. long, 4 mm. wide, straightish, strigose; seeds 5-6, oblong-ovoid, 
truncate at the ends, brownish. . 
_ Nearest to C. purpurea, from which it differs in the apparently constant broadly 
obovate leaflets. 
< U. S. Colombia, Cartajena, Schott, Leguminose No. 16; Ruatan Island, Bay of 
Honduras, G. F. Gaumer, No. 50, 1886. 
__ Types in Herb, Columbia College (Schott.) and Herb. U. S. Depart. Agric. 
