58 The Ohio Naturalist. [Vol. XIII, No. 3, 



Key to the Species. 



1. With leafy aerial stems; flowers axillary. 2. 



1. Stems geophilous, sometimes stoloniferous; flowers appearing scapose.9 



2. Stipules entire; style capitate, beakless, bearded at the summit; 



flowers yellow or white with purple veins. 3. 

 2. Stipules sharph'' dentate, serrate or lacinate, much smaller than the 

 leaf-blade; style, slender; flowers cream-colored, white, blue or 

 purple; spur at least twice as long as wide. 6. 



2. Stipules deeply divided, leaf-like, nearly as large as blade; style much 



enlarged upward into a globose hollow summit; annual or 

 biannual. 8. j 



3. Flowers yellow. 4. 



3. Flowers white with purple veins; leaves cordate-ovate, long pointed; 



plants tall. F. canadensis (1) 



4. Leaves more or less hastate, those of the stem usually near the tip; 



flowers yellow. T'. hastata (4). 



4. Leaves not hastate; borne along whole length of the stem. 5. 



5. Plant pubescent or villous. V. pubescens (3). 



5. Plant glabra te or sparsely pubescent. V. scahriuscula (2). 



6. Spur about half the length of petals or less; flowers white, cream- 



colored, pale blue or violet. 7. 



6. Spur as long as petals or longer, slender; flowers pale violet veined 



with purple. V. rostrata (7). 



7. Stipules very large, more or less lacinate, 3^-1 in. long; petals white or 



cream-colored, with purple veins. V. striata (5). 



7. Stipules small, dentate or serrate, 34-H in. long; flowers light blue or 



purple. V. labridorica (6). 



8. Flowers }4~1 in- broad, variously colored with yellow, white and 



purple; plants rather robust and spreading. V. tricolor (9). 



8. Flowers M-3^ in. broad, bluish white to cream-colored; plants tall 



and slender. V. rafinesquii (8). 



9. vStyle ending in a small hook pointing downward, not plug shaped or 



capitate; flowers deep violet purple (sometimes white), fragrant; 

 introduced species. V. odorata (10). 

 9. Style club shaped, capitate, or dilated upward, beakless or with a 



conical beak on the lower side; native species. 10. 

 10. Leaves merely crenate or dentate or incised at the base, not lobed. IL 



10. Leaves mostly lobed or parted; in ours, flowers blue or violet. 2L 



11. Flowers yellow or white; plants stoloniferous. 12. 



11. Flowers blue or violet, plants not stoloniferous. 15. 



12. Flowers yellow; style enlarging upward abruptly, capitate, beakless, 



V. rotnndiffllia (11). 



12. Flowers white, stigma with a conical beak. 13. 



13. Leaves cordate-ovate to orlncular. 14. 



13. Leaves lanceolate to linear-lanceolate. V. lunccolata (14). 



14. Upper and lateral petals three times as long as broad; petioles usually 



red-spotted. V. lecontiana. 



14. Upper and lateral petals twice as long as broad; petioles not spotted. 



I', hlanda (13). 

 1,5. Leaves of the cordate type, sometimes more or less ovate or 

 reniform. IG. 



15. Leaves of the ovate lanceolate, ovate or sagittate type, sometimes 



incised at the base. 19. 



16. Plants essentially glabrous. 17. 



16. Plants more or less pubescent. IS. 



17. Leaves cordate-ovate, attentuate at the apex, very thin. V. obliqua (15) 

 17. Leaves ovate to reniform, obtuse or merely acute at the apex, thick. 



V. papilionaceae (16) 



