Jones: Flora of Illinois, 108. Violaceae 187 



11. 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; known from Cook, Henry, and 



Macon counties. May-June V. affinis Le Conte 



10. Leaves deltoid, acuminate; petals lilac; spurred petal gla- 

 brous within; open woods. Apr.-May 



V. missouriensis Greene 



9. Hairs of the lateral petals conspicuously clavate-capitate; cleis- 

 togamous flowers on slender erect pedicels; wet ground, not 



common. May-June. Marsh Blue Violet V. cucuUata Ait 



8. Leaves decidedly pubescent; petals violet or lavender, rarely white; 

 sepals ciliolate; woods, common throughout 111. Apr.-May. 



Downy Blue Violet V. sororia Willd. 



7. Leaves sagittate-lanceolate. 



12. Leaves glabrous or nearly so; open woods. Apr.-May. Arrow- 

 leaved Violet V. sagittata Ait. 



12. Leaves pubescent; hillsides, not common; known from Cook, Lee, 



Stark, and Grundy counties. Apr.-May. [V . ovata Nutt.] 



V. fimbriatula Sm. 



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

 13. Flowers small, white, the lower petals purple-veine:'; style not 

 hooked; seeds brown or black; native species. 

 14. Leaves tapering or truncate at base. 



15. 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. May-June. Lance-leaved 



Violet V. lanceolata L. 



15. Leaves ovate, not more than twice as long as wide, usually 

 more than 2 cm. broad, truncate at base; borders of swamps; 

 known from Cook and Kankakee counties. May-June. Prim- 

 rose Violet V. primulifolia L. 



14. Leaves cordate, glabrous; pedicels usually somewhat longer than 

 the leaves; springy ground, n. 111., rare. Apr.-May. [V. blanda 



of auth., not Willd.] Smooth White Violet 



V. pallens (Banks) Brainerd 



13. Flowers large (1-2 cm. broad), violet, or sometimes white, very fra- 

 grant; style hooked; leaves broadly ovate, cordate, crenate, finely 

 pubescent; stolons rooting at the nodes; seeds cream colored; road- 

 sides and waste places, occasional; introd. from Eur. and often cult. 



Apr.- June. Sweet Violet V. odorata L. 



1. Plants caulescent at flowering time; flowers axillary. 

 16. Plants perennial; stipules small, toothed or entire. 

 17. Petals yellow. 



18. Plants nearly glabrous; basal leaves usually present at flowering 

 time; seeds 2-2.5 mm. long; woods, common. Apr.-May. [F. 



scabriuscida Schw.] Common Yellow Violet 



V . eriocarpa Schw. 



