LEGUUINOS^E. (PULSE FAMILY.) 105 



23. APIOS, Bocrh. Ground-nut. Wild Bean. 



Calyx somewhat 2-lipped, the 2 lateral teeth being nearly obsolete, the lowei 

 one longest. Standard very broad, rcflexed: the incurred scythe-shaped keel 

 at length coiled. Stamens diadelphous. Pod straight or slightly curved, 

 linear, elongated, thickish, many-seeded. — A perennial herb, bearing edible 

 tubers on underground shoots, twining and climbing over bushes. Leaflets 

 5-7, ovate-lanceolate, not stipcllate. Flowers in dense and short, often branch- 

 ing racemes, clustered. (Name from amov, a pear, from the shape of the 

 tubers.) 



1. A. tuberosa, Mcench. (Glycine Apios, L.) — Moist thickets, com- 

 mon. Aug. — Flowers brown-purple, fragrant. 



24. BIIYIVCHOSIA, Lour., DC. Rhynchosia. 



Calyx somewhat 2-lippcd, or deeply 4-5-partcd. Keel scythe-shaped, not 

 twisted. Stamens diadelphous. Ovules 2. Pod 1-2-seeded, short and flat, 

 2-valvcd. — Usually twining or trailing perennial herbs, pinnately 3-foliolate, or 

 with a single leaflet, not stipcllate. Flowers yellow, racemose or clustered. 

 (Name from piiv^os-, a beak, from the shape of the keel.) 



1. R. tomciltosa, Torr. & Gray. More or less downy; leaflets round- 

 ish ; racemes short or capitate ; calyx about as long as the corolla, 4-parted, 

 the upper lobe 2-clcft; pod oblong. — Very variable. 



Var. lllOIlopliylla, Torr. & Gray. Dwarf and upright (3'- 6' high) ; 

 leaves mostly of a single round leaflet (l'-2' wide). — S. Virginia and south- 

 ward, in dry sandy soil. 



Var. vollibilis, Torr. & Gray. Trailing and twining, less downy; leaf- 

 lets 3, roundish ; racemes few-flowered, almost sessile in the axils. — S. Virginia 

 and southward. 



Var. electa, Ton-. & Gray. Upright (l°-2° high), soft-downy; leaflets 

 3, oval or oblong. — Maryland and southward. 



25. GALACTIA, P. Browne. Milk Pea. 



Calyx 4-clcft; the lobes acute, the upper one broadest. Keel scarcely in- 

 curred. Stamens diadelphous. Pod linear, flat, several-seeded (some few of 

 them are occasionally partly subterranean and fleshy or deformed). — Low, 

 mostly prostrate or twining perennial herbs. Leaflets usually 3, stipcllate. 

 Flowers in somewhat interrupted or knotty racemes, purplish. (Name from 

 yaXa, -oktos, milk; some species being said to yield a milky juice, which is un- 

 likely.) 



1. O. glabella, Michx. Stems nearly smooth, prostrate ; leaflets elliptical 

 or ovate-oblong, sometimes slightly hairy beneath ; racemes short, 4 - 8-flowered ; 

 pods somewhat hairy. — Sandy woods, S. New York and New Jersey to Virginia 

 near the coast, and southward. July -Sept. — Flowers large for the genus, 

 rose-purple. 



2. O. mollis, Michx. Stems (decumbent and somewhat twining) and 



