138 KEY AND FLORA 
1. A. caryocarpus Ker. Grounp Pium, BurraLo AppLe. Covered 
with pale, close-lying down. Leaflets narrow, oblong. Flowers violet- 
purple, in a short, narrow raceme. Fruit looking like a small, green, 
pointed plum, about 2 in. in diameter, eatable. N.W., and S. to 
Texas. 
2. A. mexicanus A. DC. Prarrig AprLe. Smooth or with some 
loose hairs. Corolla cream color, with the tip bluish. Fruit globular, 
not pointed, eatable. Prairies, Illinois and S.W. 
3. A. canadensis L. Erect, often tall (1-4 ft. high), more or less 
downy. Leaflets oblong, 21-27. Flowers pale greenish, in long 
spikes. Pod dry, 2-celled, sessile. River bottoms, prairies, and woods. 
4. A. parviflorus MacM. Erect and slender, finely downy, some- 
what ash-color, 1-2 ft. high. Leaflets 11-21, linear, obtuse, distant. 
Flowers purple, 1} in. long, in long, slender racemes. Pods sessile, 
4 in. or less in length, concave on the back, white-hairy, becoming 
smooth. Prairies, especially N.W. 
XX. DESMODIUM Desy. (MEIBOMIA) 
Perennial herbs. Leaves pinnate, with stipules, usually 
with 3 leaflets. Flowers in axillary or terminal racemes, or 
sometimes in panicles, usually purple, sometimes pink or 
whitish. Calyx usually somewhat 2-lipped. Standard ovate, 
obovate, or roundish; wings attached to the straight or nearly 
straight keel by a little appendage projecting from each side 
of the keel. Stamens monadelphous (9 and 1) or all united at 
their bases. Pod flat, its lower margin variously lobed, sepa- 
rating into flat segments which are usually furnished with 
short, strong, hooked hairs, making the fruit a troublesome 
bur. [A large and rather difficult genus. Most of the species 
can only be distinguished by the fruit, which matures in late 
summer or autumn. | 
XXI. VICIA L. 
Climbing or spreading herbs. Leaves odd-pinnate, usually 
ending in a tendril. Leaflets many, entire or toothed at the 
tip; stipules half arrow-shaped. Flowers blue, purple, or yel- 
low, in axillary racemes. Calyx teeth nearly equal. Wings 
united to the keel. Stamens diadelphous (9 and 1); filaments 
thread-shaped ; anthers all alike. Style bent, smooth or downy 
all round or bearded below the stigma; ovules usually many. 
Pod flattened, 2-several-seeded. Seeds globular. 
