216 VIOIvACBAB 



Cleistogamous flowers on deflexed stalks : leaf-blades broadly ovate 

 to orbicular. 

 Leaf-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. primulaefolia. 

 Leaf-blades linear or linear-lanceolate, glabrous. 



21. V. lanceolata. 

 B. Plants caulescent : flowers axillary. 



Corolla yellow. 

 Leaf-blades hastate. 22. V. hastala. 



Leaf-blades broadly ovate to reniform. 

 Plant copiously pubescent : basal leaves early withering. 



23. V. 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 ; I. F. / 

 241)2.) Dry fields and hillsides, Me. and Ont. to Minn., Mo. and Pla. — 

 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. — Pennsylvania: 

 Northampton ; Bucks ; Philadelphia ; Delaware ; Chester ; 

 I/ANCASTER ; Franklin ; Huntingdon ; Allegheny. 



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

 y. 2483.) 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. 



