FABACEAE 657 



tendrils ; leaflets mostly 10-14, the blades oblong to oblanceolate, 5-12 mm. long, mucron- 

 ulate and sometimes notched at the apex, sessile or nearly so : peduncles shorter than the 

 subtending leaves, or longer : pedicels curved, 1-2 mm. long : calyx pubescent ; tube tur- 

 binate ; lobes lanceolate-subulate, the longer ones about as long as the tube : corolla bluish ; 

 keel-petals about 5 mm. long : pods oblong, about 2 cm. long, oblique at each end. 

 Ill dry soil, Arkansas to Texas. Spring. 



11. Vicla Ludoviciana Nutt. Perennial, rather stout, glabrous, or young foliage 

 sparingly pubescent. Stems angled, usually branched at the base, the branches decum- 

 bent or climbing, 3-9 dm. long, more or less branched : leaves 3-10 cm. long ; rachis end- 

 ing in a usually" forking tendril ; leaflets 6-12, the blades oblong to oval, varying to broad- 

 est above or belo-\v the middle or rarely linear-oblong, 7-23 mm. long, notched or rounded 

 at the apex, sometimes mucronulate : peduncles shorter than the subtending leaves or 

 sometimes longer at maturity : pedicels stout, about 1 mm. long : calyx membranous ; 

 lobes lanceolate or subulate-lanceolate, about as long as the whitish tube : corolla bluish ; 

 keel-petals 5 mm. long: pods oblong, 2.5-3 cm. long, oblique at both ends. 



In dry soil, Kansas to Arkansas, the Indian Territory, Florida and Texas. Spring. 



12. Vicla micrdntha Nutt. Annual, minutely pubescent or glabrate. Stems reclin- 

 ing or climbing, 3-9 dm. long, more or less branched : leaves 2-6 cm. long ; rachis ending 

 in a forking tendril ; leaflets variable, the blades of those of the lower leaves obovate to 

 oval, 5-12 mm. long, those of the upper leaves narrowly oblong or linear, 1-3.5 cm. long : 

 peduncles 5-20 mm. long, 1-2-flowered : pedicels 2-4 mm. long : calyx campanulate ; tube 

 minutely pubescent ; lobes variable, the shorter triangular, the longer triangular-lanceolate : 

 corolla pale blue or white ; keel-petals about 5 mm. long, oblique at each end : pods nar- 

 rowly oblong, about 1 cm. long. 



In thickets on river banks, Tennessee to Missouri, Alabama and Texas. Spring. 



13. Vicia sativa L. Annual, sometimes sparingly strigillose. Stems branched at 

 the base, the branches angled, trailing or climbing, 2-10 dm. long, often branching : 

 leaves 5-10 cm. long ; rachis terminating in a forking tendril ; leaflets 8-14, the blades 

 linear, linear-lanceolate or oblong, 1-4 cm. long, mucronate, short-stalked : peduncles 

 very short or almost none, 1-2-flowered : calyx usually pubescent ; tube 5-6 mm. long, 

 membranous ; lobes subulate-lanceolate, about as long as the tube or shorter : corolla 

 bluish purple ; keel-petals 1.5-2.5 cm. long: pods linear-oblong, 4-8 cm. long, glabrous. 



In waste places and fields, throughout North America, except northern British America. Natural- 

 ized from Europe. Spring and summer. 



14. Vicla angustifolia Roth. Annual, often sparingly strigillose. Stems branched 

 at the base, the branching trailing or climbing, 3-9 dm. long, angled : leaves 5-10 cm. 

 long ; rachis terminating in a forking tendril ; leaflets 8-16, the blades linear, varying to 

 lanceolate or oblanceolate, 1-3.5 cm. long, truncate or notched at the apex, mucronate : 

 peduncles usually none : pedicels 1-3 mm. long : calyx minutely pubescent ; tube pale, 

 ridged, 5-6 mm. long ; lobes subulate, shorter than the tube : corolla purplish ; keel-petals 

 1-1.5 cm. long : pods linear, 4—5 cm. long, acute, glabrous, oblique at each end. 



In waste places, Nova Scotia to Florida. Native of Europe. Spring and summer. 



55. LATHYRUS L. 



Vines or bushy herbs, with tendrils terminating the leaves. Stems usually angled or 

 winged. Leaves alternate : blades equally pinnate : leaflets with entire blades. Flowers 

 perfect, solitary on axillary peduncles or in racemes. Calyx usually oblique : tube some- 

 times gibbous at the base : lobes nearly equal or the upper ones shorter than the lower. 

 Ccu'olla of various colors, often showy : standard with a broad ^emarginate blade and a 

 short claw : wings curved, partially coherent with the shorter incurved obtuse keel-petals. 

 Stamens diadelphous, or monadelphous below. Anthers alike. Style flattened, pubescent 

 on the side opposite the standard. Pod elongated, terete or flattened. Seeds subglobose 

 or angled. 



Annual: leaflets 2: keel-petals less than 10 mm. long. 1. L. pusillus. 



Perennial : leaflets 4 or more : keel-petals over 10 mm. long. 



Stems glabrous or nearly so : racemes 3-8-flowered ; stipules much broader than 



the stem. 2. X. myrtifolius. 



Stems finely pubescent: racemes 10-20-flowered : stipules about as broad as the stem. 3. L. venoms. 



1. Lathyrus pusillus Ell. Annual, glabrous. Stems usually branched at the base, 

 the branches spreading or climbing, 1-6 dm. long, 2-winged : leaves numerous ; rachis 

 terminating in a simple or forking tendril ; stipules lanceolate, slightly curved, prolonged 



42 



