216 VIOLACEAE 



Cleistogamous flowers on deflexed stalks : leaf-blades broadly ovate 

 to orbicular. 

 I^eaf-blades ovate-cordate, glabrate. 

 Upper and lateral petals twice as long as broad : petioles spotless. 



17. V. blanda. 

 Upper and lateral petals thrice as long as broad : petioles spotted. 



18. V. LeConieana. 

 Leaf-blades reniform, copiously pubescent. 19. V. renifolia. 



Cleistogamous flowers on erect stalks : leaf -blades linear to oblong- 

 oval or narrowly ovate. 

 Leaf-blades ovate, oval or oblong, more or less pubescent. 



20. V. primulaefolis. 

 Leaf-blades linear or linear-lanceolate, glabrous. 



21. V. lanceolata. 

 B. Plants caulescent : flowers axillary. 



Corolla yellow. 



Leaf-blades hastate. 22. V. hastata. 



Leaf-blades broadly ovate to reniform. 



Plant copiously pubescent : basal leaves earl3' withering. 



23. F. pubescens. 

 Plant glabrate or sparingly pubescent : basal leaves persistent. 



24. V. scabriuscula. 

 Corolla purple, blue, white or cream-colored. 



Stipules entire. 25. V. Canadensis. 



Stipules incised or pinnatifid. 



Plants perennial : stipules much smaller than the leaf-blades. 

 Petals cream-colored, the lower one purple-veined. 



26. V. striata. 

 Petals blue or purple or rarely white. 

 Spur of the corolla shorter than the petals. 27. V. Labradorica. 

 Spur of the corolla longer than the petals. '' 28. V. rostrata. 

 Plants annual : stipules nearly as large as the leaf-blades. 

 Corolla mostly over 16 mm. wide : naturalized species. 



29. V. tricolor. 

 Corolla mostly less than 16 mm. wide : native species. 



30. V. Rafinesquii. 



1. Viola pedata L. Bird's-foot Violet. (Man. p. 636; L F. /. 

 2492.) Dry fields and hillsides, Me. and Ont. to Minn., IMo. and Fla. — 

 Pennsylvania : Monroe ; Northampton ; Bucks ; Delaware ; Ches- 

 ter ; Lancaster ; Franklin ; Huntingdon. 



2. Viola palmata L. Early Blue Violet. (Man. p. 635 ; I. F. /. 

 2484.) In woodlands, Me. to Ont., Minn., Ga. and Ark. — Pemisylvania : 

 Northampton ; Bucks ; Philadelphia ; Delaware ; Chester ; 

 Lancaster ; Franklin ; Huntingdon ; Allegheny. 



3. Viola Brittoniana Pollard. Coast ViolET. (Man. p. 635 ; I. F. 

 f. 24S5.) Sandy soil near the coast, Mass. to N. C. — Pennsylvania: 

 Bucks ; Philadelphia. 



4. Viola obliqua Hill. Thin-leaved Wood Violet. (Man. p. 636.) 

 Rich soil in shade, N. Y. to Va. — Pennsylvania : Monroe ; North- 

 ampton; Bucks; Lancaster; Franklin; Huntingdon; Cambria; 

 Somerset ; Allegheny. 



