634 FLORA. 



Leaves pedately divided into linear lobes. 



Eastern coastal plain species ; leaves thin. 2. V. Brittoniana. 



Western prairie species; leaves thick. 3. V. fiedatifida. 



Leaves palmately lobcd or cleft, the segments variously shaped. 



Leaf-segments linear-lanceolate, obtuse; cleistogamous flowers on decumbent 



peduncles. 4. V. Bernardi. 



Leaf-segments mostly ovate, coarsely incised; cleistogamous flowers on erect 



peduncles. 5. V. via? urn. 



Leaf-segments often falcate ; cleistogamous flowers on decumbent peduncles. 



6. V.falcata. 

 Petals not bearded; cleistogamous flowers wanting. 7. V. pedal a. 



XX Leaves merely crenate or denlale, or incised at base, none lobed. 



Leaves ovate, reniform or orbicular, often broader than long, not incised at base. 



Woodland species ; peduncles of the cleistogamous flowers, horizontal or decumbent. 

 Plant densely hirsute or villous ; keel petal cuspidate. 8. V. cuspidata. 



Plants sparingly hirsute or glabrous ; keel petal not cuspidate. 



Leaves very thin, cordate-ovate, attenuate at apex. 9. V. obliqua. 

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

 Petals dark violet-purple, narrow, the upper reflexed. 



10. V. papilionacea. 

 Petals light blue, paler at base, broadly obovate. 



11. V. pratincola. 

 Petals reddish-purple, nearly orbicular. 12. V. villosa. 



Meadow or swamp species ; peduncles cf the cleistogamous flowers erect (often hori- 

 zontal in V. venustula). 



Flowers pale violet-blue; leaves light green. 



Capsule strongly 3-angled ; plant not northern. 13. V. cucullata. 



Capsule very short, not angled ; plant far northern. 14. V. septenlrionalis. 

 Flowers deep purple, paler at base ; leaves rather dark green. 



Leaves attenuate at apex, crenate-serrate. 15. V. venustula. 



Leaves obtuse or merely acutish at apex, the margin crenulate. 



16. V. vagula. 

 Leaves lanceolate, oval or ovate-lanceolate, often incised at base. 



Scapes shorter than the leaves. 



Petals scarcely emarginate ; leaf-blades sagittate-lanceolate. 



17. V. sagittata. 

 Petals usually emarginate ; leaf-blades ovate or deltoid-triangular. 



18. V. emarginata. 

 Petals not emarginate ; leaf -blades oblong-triangular. 19. V. dentata. 



Scapes longer than the leaves. 



Introduced European species ; leaf-blades lanceolate. 20. V. lanci/olia. 

 Native species ; leaf-blades ovate-lanceolate or oblong. 



Plants glabrous and succulent, densely tufted. 21. V. conjugens. 



Plants pubescent, not succulent, mostly solitary. 22. V. fimbriatula. 



ft Plants stoloniferous. 

 Introduced species ; flowers deep violet-purple, sometimes white. 23. V. odorata. 

 Native species; flowers pale purple, violet-blue, yellow or white. 



Flowers yellow. 24. V. rotundi/olia. 



1 lowers pale blue or lilac. 



Leaves glabrous, crenulate. 25. V. palustris. 



Leaves hirsute-pubescent, crenate. 26. V. Selkirkii. 



Flowers white. 



Leaves from broadly ovate to orbicular; cleistogenes on deflexed peduncles. 

 Leaf-blades cordate-ovate, glabrate. 



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



27. V. blanda. 

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

 red-spotted. 28. V. also phi la. 



Leaf-blades reniform, pubescent. 29. V. reni/olia. 



Leaves from narrowly oval to linear; cleistogenes on erect peduncles. 



Leaf-blades oval or ovate, sometimes pubescent. 30. V. primulaefolia. 

 Leaf-blades lanceolate linear-lanceolate, glabrous. 31. V. lanceolata. 



♦♦CAULESCENT, LEAFY-STEMMED; FLOWERS AXILLARY 



Flowers yellow. 



Leaves lanceolate, decurrent at base. 32. V.Nuttallii. 



Leaves hastate, broadly ovate or reniform, not decurrent. 



