652 FABACEAE 
blades broadest below the middle. Flowers perfect, showy, solitary in the axils, or in 
dense racemes. Calyx much longer than broad. Corolla white, blue, purple or red: 
standard large, erect ; blade notched at the apex: wings curved: keel-petals shorter than 
the wings, incurved, acute. Stamens diadelphous (9 and 1), or partially monadelphous. 
Anthers alike. Ovary stalked. Style slender, incurved, the apex horizontally flattened. 
Pod narrow, somewhat flattened. BUTTERFLY PEA. 
1. Clitoria Mariana L. Foliage glabrous or nearly so. Stems erect, ascending or 
climbing, 3-12 dm. long, branching: leaflets 3, the blades ovate-lanceolate or narrowly 
ovate, mucronate at the apex, rounded or subcordate at the base: peduncles much shorter 
than the petioles: calyx-tube slightly dilated upward, 10-15 mm. long; lobes ovate, acu- 
minate, about 4 as long as the tube: corolla lilac or pale blue: standard with an obovate 
blade 5-6 cm. long, notched at the apex, striped with magenta near the center: pods linear 
or linear-oblong, 2.5-3 cm. long, acute. 
In sandy soil, New York to Missouri, Florida and Texas. Spring and summer. 
49. APIOS Moench. 
Vines, with twining stems and very large roots. Leaves alternate, with small stipules: 
blades pinnately 3-foliolate : leaflets with blades broadest below the middle. Flowers per- 
fect, in dense racemes or panicles. Calyx pedicelled, the 2 upper lobes united into a broad 
lip, the 2 lateral ones small, the lower one longer, acute. Corolla red, purple or choco- 
late-colored, often variegated: standard reflexed ; blade broad, auricled at the base: 
wings oblique, shorter than the standard: keel elongated, more or less strongly spirally 
twisted, cohering to the wings. Stamens diadelphous (9 and 1). Anthers alike. Ovary 
nearly sessile. Style glabrous, thickish, inflexed above. Pod elongated, curved, some- 
what flattened. GRoUND-NUT. 
Standard with the blade rounded or retuse at the apex. 1. A. Apios. 
Standard with the blade produced into a spongy appendage at the apex. 2. A. Priceana. 
1. Apios Apios (L.) MacM. Roots tuberous, l-several cm. thick. Foliage glabrate 
or roughish-pubescent. Stems branching, the branches twining and climbing, 3-12 dm. long, 
slender : leaves 1-2 dm. long; leaflets 5-7 or rarely 3, the blades ovate to lanceolate, 3-10 
cm. long, acute or acuminate at the apex, rounded or subcordate at the base, on short 
hairy petiolules: panicles 3-10 cm. long: calyx with a campanulate tube 2-4 mm. long ; 
lobes unequal, but all very short, the margin of the calyx often merely undulate : corolla 
brownish purple ; standard with a broad bizde about l em. long: pods linear, 6-12 cm. 
long, acute, straight or curved, especially near the apex. [A. tuberosa Moench. ] 
In thickets and low grounds, New Brunswick to Minnesota, Florida and Texas. Summer and fall. 
2. Apios Priceana Robinson. Roots oblate-spheroidal, often 18 em. thick. Stems 
herbaceous, twining, 1-3 m. long, more or less copiously pubescent with reflexed hairs, or 
usually glabrate: leaves 2-2.5 dm. long or shorter on the branches; leaflets 5-9, or 
rarely 3, the blades thinnish, ovate or ovate-lanceolate, 4-10 cm. long, acuminate, spar- 
ingly pubescent on both sides, scarcely paler beneath than above, rounded or obtuse at the 
base: panicles densely flowered, commonly 2-3 together in an axil, those of the main 
stem 10-15 cm. long, with 50-70 flowers; those of the branches smaller: calyx with a 
hemispheric tube and slender lower lobe : corolla greenish white tinged near the apex with 
rose purple, or magenta ; standard with the suborbicular blade about 2.5 em. long, pro- 
duced into a spongy appendage at the apex : pods linear, clustered, 12-15 em. long, 1 em. 
broad, acuminate at the apex : seeds often 10, 8 mm. long, olive-green. 
In rocky woods, Kentueky and Tennessee. Summer. 
50. PHASEOLUS L. 
Perennial vines, with prostrate or twining stems. Leaves alternate : blades pinnately 
3-foliolate or rarely 1-foliolate, with persistent stipules : leaflets with entire or lobed blades, 
commonly membranous. Flowers perfect in axillary, peduncled racemes or — 
Calyx pedicelled: lobes 5, nearly equal, or the 2 upper partially united. Corolla o 
various colors, often variegated : standard with a suborbicular, spreading or recurved 
blade, the margin sometimes inflexed : wings broadest above the middle: keel-petals spirally 
twisted, with a long obtuse beak. Stamens 10, diadelphous (9 and 1). Anthers uni- 
