Vicia

In Vicia, the style is glabrous except for a tuft or fringe of hairs at the summit, just below the stigma. In Lathyrus, the style has a longer strip of pubescence. Only two of our species are native in North America. The others are all European, doubtless originally grown for forage or as a cover crop.

1. Inflorescences sessile or on peduncles shorter than the leaflets, 1–2-flowered.

2. Calyx oblique at apex, the teeth unequal (upper ones smaller) and all less than half as long as the tube and less than 2 mm long; perennials.

V. sepium

2. Calyx not oblique, the teeth ± equal, ca. half as long as the tube or longer and more than 2 mm long; annuals.

3. Corolla yellow (sometimes marked or suffused with purplish), ca. 25–35 mm long; calyx teeth clearly shorter than the tube.

V. grandiflora

3. Corolla blue to purple (or white), ca. 5–16 (–30) mm long; calyx teeth nearly or quite as long as the tube.

4. Corolla ca. (10–) 13–16 (–30) mm long; most tendrils branched.

V. sativa

4. Corolla ca. 5–8 mm long; most tendrils unbranched.

V. lathyroides

1. Inflorescences on peduncles longer than the leaflets, with usually more than 2 flowers.

4. Leaflets with ca. 10 or more pairs of firm lateral veins running nearly or quite to the margins; stipules with several teeth or lobes; inflorescences slightly exceeded by subtending leaves, 3–8-flowered.

V. americana

4. Leaflets with ca. 6 or fewer pairs of lateral veins running nearly or quite to the margins; stipules at most with 1 basal lobe; inflorescences shorter or longer than the leaves.

5. Flowers less than 6 (–8) mm long, 1–6 (–7) in an inflorescence; calyx teeth (at least the longer ones) about as long as or longer than the tube.

6. Calyx teeth ± equal; fruit pubescent, (6–) 8–9 (–10) mm long, 2-seeded.

V. hirsuta

6. Calyx teeth unequal, the calyx clearly oblique; fruit glabrous, 10–13 mm long, mostly 4-seeded.

V. tetrasperma

5. Flowers at least 8 mm long, (8–) 12–40 or more in an inflorescence; calyx teeth often shorter than the tube.

7. Calyx ca. 3 mm long or shorter, the teeth deltoid (about as long as broad), ± equal; corolla white (except for blue-tipped keel) or occasionally tinged with blue.

V. caroliniana

7. Calyx ca. 3.5–8 (–9) mm long, the teeth elongate (at least the lower ones) and distinctly unequal; corolla (except in albinos) blue to purple (or rarely pink).

8. Calyx not extended beyond the pedicel, which appears basal (though off-center); blade of standard about equaling the claw; stem and pedicels with mostly appressed or incurved pubescence.

V. cracca

8. Calyx projecting at its base beyond the attachment of the pedicel, the latter thus appearing subterminal or ventral; blade of standard about half as long as the claw or shorter; stem and pedicels usually covered with fine spreading hairs (rarely glabrate).

V. villosa

All species found in Vicia

Vicia americanaAMERICAN VETCH 
Vicia carolinianaPALE VETCH, WOOD VETCH 
Vicia craccaBIRD VETCH 
Vicia grandifloraLARGE-FLOWERED VETCH 
Vicia hirsutaHAIRY VETCH 
Vicia lathyroidesSPRING VETCH 
Vicia sativaCOMMON VETCH 
Vicia sepiumHEDGE VETCH 
Vicia tetraspermaSPARROW VETCH 
Vicia villosaHAIRY VETCH 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March 27, 2017. http://michiganflora.net/genus.aspx?id=Vicia.