138 KEY AND FLORA 
1. A. caryocarpus Ker. Grounp PLum, Burrato Arpie, Covered 
with pale, close-lying down. Leaflets narrow, oblong. Flowers violet- 
purple, in a short, narrow raceme. Fruit looking like a sinall, green, 
pointed plum, about } in. in diameter, eatable. N.W., and 8. to 
Texas. 
2. A. mexicanus A. DC. Prairie Appie. Smooth or with some , 
loose hairs. Corolla cream color, with the tip bluish. Fruit globular, 
not pointed, eatable. Prairies, linois and $.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, !=! in. long, in long, slender racemes. Pods sessile, 
} 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 5 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. 
