142 LEGUMINACEAE (BEAN FAMILY) 



EE. Plant villous-pubescent; 1.5-3 dm. high; pod pubescent; leaflets 4-14 mm. 

 long. W. C. V. californica 



AA. Flowers solitary or in 2's in the axils of the leaves, nearly sessile; annuals. 

 G. Flowers white or purplish, 6 mm. long; pod 1.6-2.5 cm. long. U. C. V. exigua 

 GG. Flowers purple, 12-25 rnm. long; pod 2.5-7.5 cm. long. 



H. Leaflets oblong to ovate; pod brown; flowers 18-25 mm. long. W. C. 

 Sown for hay. V. sativa (SPRING VETCH) 



HH. Leaflets linear to linear-oblong; pod black; flowers 12-16 mm. long. W. 



V. angustifolia (COMMON VETCH) 



LATHYRUS (PEA) 



Erect to vining. Leaves mostly with tendrils. Flowers axillary, soli- 

 tary or in racemes. Calyx oblique or gibbous at base. Corolla tawny or 

 white to purplish. Stamens diadelphous in groups of 9 and i, or mona- 

 delphous below. Ovules usually many. Pod flat or terete. (Gk. lathyros 

 = the name of some plant of this family.) Relished by stock. 



A. Plant densely silky- villous; rachis of leaves without tendrils. W. 



L. littoralis (SHAGGY PEA) 

 AA. Plant not villous, either glabrous or pubescent; rachis of leaves mostly with 



tendrils or their rudiments. 

 B. Flowers purple or whitish. 

 C. Stipules narrow, half-sagittate, their lobes usually lanceolate and acuminate; 



plants glabrous or pubescent. 

 D. Leaflets 6-14 mm. long, pubescent. 



E. Peduncles i-2-flowered; stem very slender. W. 



L. torreyi (I-FLOWERED PEA) 



EE. Peduncles 4-6-flowered; stem rigid. W. L. vestitus 



DD. Leaflets 15-25 mm. or more long, glabrous or hairy. 



F. Leaflets 2-4, 2.5-8.7 cm. long; peduncles 2-flowered; flowers purplish. E. 



L. bijugatus 

 FF. Leaflets 4-6 or more, often shorter; either peduncles with 3 or more flowers, 



or else flowers white. 

 G. Flowers white. 



H. Leaflets 1.4-2 cm. long. E. L. rigidus 



HH. Leaflets 2.5-7.5 cm. long. 



I. Leaflets linear to linear-lanceolate. E. L. cusickii 



n. Leaflets ovate to ovate-oblong. E. L. obovatus 



GG. Flowers purple. 



J. Stem wingless, although sometimes angular. 

 K. Flowers 25 mm. or more long, 3-5 on a peduncle. E. 



L. decaphyllus (PRAIRIE PEA) 



KK. Flowers 10-20 mm. long, often more than 5 on a peduncle. 

 L. Plant glabrous throughout or merely minutely papillose. 

 M. Peduncles about equaling the leaves; leaves not thick nor coriaceous. 

 U. L bolanderi 



MM. Peduncles much shorter than the leaves; leaves thick-coriaceous. 

 W. E. L. coriaceus 



LL. Plant pubescent. 

 N. Leaflets lanceolate, pubescent on both sides, obtuse. E. 



L. oregonensis 



NN. Leaflets oblong to ovate, pubescent beneath, glabrous above, acute. 

 W. C. E. L. nuttallil 



