LEGUMINOS^. (pulse FAMILY.) 105 



23. A P I O S , Boerh. GnouND-Nni. Wild Bean. 



Calyx somewhat 2-lipped, the 2 lateral teeth bemg nearly obsolete, the lower 

 one longest. Standard very broad, reflexed : the incurved scythe-shaped keel 

 at length twisted. 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 stipellate. Flowers in dense and short, often branch- 

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

 tubers.) 



1. A. tllbci'osa, Moench. (Glycine Apios, i.) — Moist thickets, com- 

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



24. RHYlVCHdSIA, Lour., DC. Rhtnchosia. 



Calyx somewhat 2-Iipped, or deeply 4-5-parted. Keel scythe-shaped, not 

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

 2-valved. — TJsnally twining or trailing perennial herbs, pinnatoly 3-foliolate, or 

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

 (Name from pvvxos, a beak, from the shape of the keel.) 



1. K. tomcntosa, Torr. & Gray. More or less downy; leaflets round- 

 ish ; racemes short or capitate ; calyx about as long as the corolla, 4-pai'tcd, 

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



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

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

 ward, in diy sandy soil. 



Var. volil1>iliS, Torr. & Gray. Trailing and twining, less downy; leaf- 

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

 and southward. 



Vai-. crecta, Torr. & Gray. Upright (l°-2° high), sof^downy ; leaflets 

 3, oval or oblong. — Mai-yland and southward. 



25. GALiACTIA, P. Bro\vne. Milk Pea. 



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

 curved. 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, stipellate. 

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

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

 likely.) 



1. G. glabella, Michx. Sfems ?icarfy s?noo(A, 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. G. nidllis, Michx. Stems (decumbent and somewhat twining) and 



