170 FABACEAE. 



10-17 mm. long: pods 4-8 cm. long. N. S. Common, in thickets. Sand- 

 and shales, schists. Sum. WILD-BEAN. BEAN-VINE. 



20. STROPHOSTYLES Ell. Vines or trailing plants. Leaflets 3. 

 Eacemes or panicles cluster-like. Calyx similar to that of Phaseolus, but the 

 lower lip with a larger middle lobe. Corolla mainly pink-purple or white: 

 blades of the keel-petals widely dilated at the base. Style spiral. Seeds with 

 truncate ends. 



1. S. unibellata (Muhl.) Britton. Stems trailing: leaflets 1-4 cm. long; 

 blades oblong-lanceolate, varying to ovate or lanceolate: corolla pink or pale- 

 purple, often fading yellowish; blade of the standard reniform, 1-2 cm. broad: 

 pods 2.5-5 cm. long. S. Common, in dry soil. Serpentine. Sum. 

 WILD-BEAN. 



21. VTCIA [Tourn.] L. Trailing or climbing herbs. Leaflets few or 

 many: blades entire, or toothed at the apex. Eacemes few-many-flowered, 

 usually 1-sided. Calyx more or less 2-lipped: lobes of the lower lip usually 

 longer than those of the upper. Corolla variously colored or white: blades of 

 the wings more prominently auricled than those of the keel-petals. Filaments 

 united to near the tips. Style with a tuft of hairs at the apex, or pubescent 

 on the side opposite the keel. Pods relatively flat. Sum. VETCH. TARE. 

 PEA-VINE. 



Longer calyx-lobes shorter than the tube : peduncles elongate. 



Wings with the claw shorter than the blade : standard less than 15 mm. long. 

 Longer calyx lobes subulate : blades of the keel-petals shorter than the claws. 



1. V. Cracca. 

 Longer calyx-lobes triangular-lanceolate : blades of the 



keel-petals as long as or longer than the claws. 2. V. carollniana. 



Wings with the claw as long as or longer than the blade : 



standard over 15 mm. long. 3. V. americana. 



Longer calyx-lobes longer than the tube : peduncles very short, 



or obsolete. 4. V. sativa. 



1. V. Cracca L. Leaflets 18-24; blades linear to oblong-linear, 9-20 mm. 

 long, acute or mucronate: calyx 5-6 mm. long; upper lobes deltoid; lower 

 lobes lanceolate, about as long as the tube: corolla blue or purple; standard 

 pandurate, 10.5-11.5 mm. long: keel 8-8.5 mm. long: pods 2-2.5 cm. long. 

 M. Occasional, in fields and waste places. Nat. of Eu. 



2. V. caroliniana Walt. Leaflets 8^-16; blades oblong to oval-oblong, 1-2 cm. 

 long, mucronate: calyx 2.5-3 mm. long; lobes triangular: corolla white, except 

 the blue-tipped keel; standard 9-10 mm. long: keel 5-6 mm. long: pods 2.5-3 

 cm. long. S. Islands in the Susquehanna. Schists. 



3. V. americana Muhl. Leaflets 8-14; blades ovate to oblong. 1.5-4 cm. long, 

 mucronate: racemes 4-8-flowered: calyx 6-7 mm. long; lobes triangular or 

 deltoid, much shorter than the tube: corolla purple or purplish; standard 

 15-18 mm. long: pods 2.5-3.5 cm. long. M. Eare, on shaded banks of the 

 Conestoga Creek. Limestones. 



4. V. sativa L. Leaflets 8-14; blades linear, linear-lanceolate, or oblong, 1-4 

 em. long: calyx 10-12 mm. long: corolla purple or deep-pink: standard and 

 wings mostly over 15 mm. long: pods 4-8 cm. long. M. Eare, in fields and 

 on roadsides. Nat. of Eu. SPRING VETCH. 



22. LATHYRUS L. Plants similar to Vicia in habit, but usually larger; 

 filaments usually less united: style pubescent on the side opposite the standard: 

 pod more turgid. Sum. VETCHLING. 



