44 LEGUMINOSEZ. (PEA FAMILY.) 
mostly cuneate, oblong, obtuse, denticulate, an inch long or less; flowers yellow, a line 
long, in slender axillary pedunculate racemes; pedicels a line long. 
6. MEDICAGO, L . 
Characters nearly as the last; style subulate; pod compressed, faleate, incurved or 
spirally coiled. 
1. M. sativa, L. (Lucern, Auraura.) Stems erect, 1 to 4 ft. high; from a deep 
perennial root, smooth; leaflets cuneate-oblong or oblanceolate, toothed above; flowers 3 
or 4 lines long, racemed; pods numerous, spirally twisted, veined, smooth. 
2. M. denticulata, Willd. Bur-CLover. Annual, nearly smooth, prostrate or 
ascending; leaflets cuneate-obovate or obcordate, toothed above; flowers small, yellow, 
usually 3 to 8 in an axillary cluster; pods spiral, armed with a double row of hooked 
prickles. 
3. M. lupulina, L. Pubescent, procumbent; flowers very small, yellow, in short 
spikes; pods smooth, reniform, 1-seeded. 
7. HOSACKIA. Douglas. 
Calyx teeth nearly equal, usually shorter than the tube. Petals free from the stamens, 
nearly equal; standard ovate or roundish, the claw often remote from the others; wings 
obovate or oblong; keel somewhat incurved. Style incurved. Pod linear, sessile, several . 
seeded, partitioned between the seeds. Herbaceous or rarely sufirutescent; leaves 
pinnate, 2-many-foliolate; stipules minute and gland-like, rarely scarious or foliaceous; 
flowers yellow or reddish, in axillary sessile or pedunculate umbels. 
The flowers usually change to reddish or reddish-brown in drying. Matured pods are 
necessary for the determination of species. : 
§ 1. Pod shortly acute, linear and many-seeded, straight, smooth; seeds suborbicular; 
flowers and fruit not reflexed; peduncles long; keel bread above mostly obtuse. 
Stipules large, foliaceous; villous, viscid..........eeceeeeceeeeeeees H. stipularis. 1 
Stipules scarious; smooth. 
Bract small or none; wings usually white....... ibis eee ici adcvetoierels eaataneane H. bicolor. 2 
Bract 1-3-foliolate, at the umbel; keel and wings prrplisl ieeeuindged eas H. gracilis, 3 
Stipules reduced to blackish glands. 
Appressed-pubescent; tall, stout; pod long, smooth................ H. grandiflora. 4 
Flowers very small, solitary.........ccccee cece cece seeeeet ee eee cee H. parviflora. 5 
§ 2. Pod shortly acute, 8-7-seeded, straight; flowers small, mostly solitary; keel acute; 
stipules gland-like; villous. 
Blade of the standard cordate; leaflets 3 to 5; nearly smooth......... H, parviflora. 5 
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