240 Leguminaceae 
indehiscent, connected in the middle. (Gk. hedys—sweet, aroma—smell; apparently from 
the fragrant flowers of some.) 
A. Flowers cream-colored. E. (H. flavescens.) 
H. sulphurescens Rydb. 
AA. Flowers light purple. 
B. Stems and leaves canescent. E. 
H. cinerascens Rydb. 
BB. Stems and leaves green, glabrate or nearly so. W.E. (H. mackenzii; H. 
uintahensis; H. occidentalis.) H. boreale Nutt. 
VICIA VETCH 
Herbaceous, viney, climbing or trailing or quite weak. Leaves pinnate, tendril- 
bearing; stipules half-sagittate or entire. Flowers axillary, solitary or in racemes. Ca- 
lyx-tube oblique; calyx-teeth about equal or the 2 upper ones slightly longer. Corolla 
blue or violet or white or yellow; standard obovate or oblong, emarginate, clawed; wings 
obliquely oblong, adherent to the keel; keel shorter than the wings, oblong, curved. Sta- 
mens diadelphous in groups of 9 and 1, or monadelphous below. Ovules several to many; 
style very slender with a tuft or ring of hairs at its summit. Pod flat, dehiscent, 2-valved. 
(Gk. bikion and L. vicia—the names of these plants.) 
A. Flowers in spikes or racemes on axillary peduncles. 
B. Leaflets 20——30, 2.55 cm. long; flowers ochroleucous or tawny; perennial. 
W.C. E. (V. semicincta.) V. gigantia Hook. (Giant Vetch) 
BB. Leaflets either fewer or less than 2.5 cm. long; flowers from white to purple. 
C. Flowers bluish-white, 4 mm. or less long; peduncles 2—6-flowered: plant an- 
nual; leaflets 12—14; pod hairy. W. 
V. hirsuta Koch. (Hairy Vetch) 
CC. Flowers deep blue, 5—18 mm. long; plant perennial. ; 
D. Leaflets 18 —24; peduncles densely 15—40-flowered; pod glabrous. W. 
V. cracea L. (Tufted Vetch) 
DD. Leaflets 8—16; peduncles loosely 5—1 6-flowered. 
E. Plant glabrous or not villous if hairy, 3—1I2 dm. high; pod glabrous; 
leaflets 12-25 mm. long. 
F. Leaves ovate-lanceolate to broadly oval. W. C. E. (V. truncata; 
V. americana truncata; V. americana oregana.) 
V. americana Muhl. (Common Vetch) 
FF. Leaves narrowly linear to oblong. W. C. E. (V. americana lin- 
earis. ) V. linearis Gr. (Narrow-leaved Vetch) 
FE. Plant villous-pubescent; 1.5—3 dm. high; pod pubescent; eaters 
414 mm. long. W. C. 
V. californica Gr. 
AA. Flowers solitary or in 2’s in the axils of the leaves, nearly sessile; annuals. 
G. Leaflets 6—8, oblong to linear; flowers white or purplish, 6 mm. long; pod 
1.6—2.5 cm. long. U. C V. exigua Nutt. 
GG. Leaflets 8—16; flowers purple, |2—-25 mm. long; pod 2.57.5 cm. long. . 
tH. Leaflets oblong to ovate; pod brown; flowers 1825 mm. long. W. C. 
V. sativa L. (Spring Vetch) 
HH. Leaflets linear to linear-oblong; pod black; flower 12-16 mm. long. W. 
V. angustifolia Roth. (Common Vetch) 

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