62 American Midland Naturalist Monograph No. 7 



occur in 111. as far north as Bureau Co. 



Apr.-May. Confederate Violet 



T'. priceana Pollard 



12. Leaf-blades acutish, narrowly cordate, usually 

 longer than broad; spurred petal hirsute 

 within; cleistogamous flowers on ascending 

 pedicels; seeds light brown; moist soil, not 

 common. May-June. Woodland Blue Violet 



V. affinis LeConte 



11. Leaves deltoid, acuminate; petals lilac; spurred 

 petal glabrous within; open woods. Apr.-May 



V . jnissouriensis Greene 



10. Hairs of the lateral petals conspicuously clavate- 

 capitate; cleistogamous flowers on slender erect 

 pedicels ; wet ground, not coinmon. May- June. 



Marsh Blue Violet L. cucullata Ait. 



9. Leaves decidedly pubescent ; petals violet or lavender, 

 rarely white; sepals ciliolate; woods, common through- 

 out 111. Apr.-May. Downy Blue Violet 



V . sororia Willd. 



8. Leaves sagittate-lanceolate. 



14. Leaves glabrous or nearly so, rather long-petioled, 

 lanceolate, often dilated and incised at base; open 



woods. Apr.-May. Arrow-leaved Violet 



V. sagittata Ait. 



14. Leaves pubescent, mostly short-petioled, ovate, crenate; 

 hillsides, not common; chiefly in the n. half of the 



state. Apr.-May. Sand Violet [F. ovata Nutt.] 



V . fimbriatula Sm. 



2. Rhizome slender (1-2 mm in diameter); plants usually stolo- 

 niferous. 

 15. Flowers small, white, the lower petals purple-veined; style 

 not hooked; seeds brown or black; native species. 

 16. Leaves tapering or tioincate at base. 



17. Leaves lanceolate or elliptical-lanceolate, several times 

 as long as broad and usually less than 2 cm wide, 

 tapering at the base; borders of swamps, local; s. 

 to Wabash Co. May- June. Lance-leaved Violet 



L. lanceolata L. 



17. Leaves ovate, not more than twice as long as wide, 

 usually more than 2 cm broad, truncate at base; 

 borders of swamps; Kankakee Co. May- June. 



Primrose Violet V. prwjulifolia L. 



16. Leaves cordate, glabrous; pedicels usually somewhat 

 longer than the leaves; springy ground, rare; Cook, 

 Lake, Ogle, and Winnebago counties. Apr.-May. 

 Smooth White Violet [L. blanda sensu auth., non 

 W^illd.] V. pallens (Banks) Brainerd 



