|Viola rostrata Pursh
The leaves are simple, toothed, ovate and acute, except basal leaves, which are cordate. (2–4 cm)
Habitat: Rich woodlands
Eastern North America from Ontario and Quebec in the north to Alabama and Georgia in the south.
V. rostrata can easily be distinguished from other Viola species by its long spur, but the species is known to hybidize with other Viola species (see: Hybrids)
- Gleason, Henry A and Arthur Cronquist. 1991. Manual of vascular plants of northeastern United States and adjacent Canada, 2nd ed. New York Botanical Gardens, New York, New York.
- Rhoads, Ann Fowler and Timothy A Block. 2007. Plants of Pennsylvania: an illustrated manual, 2nd ed. University of Pennsylvania Press, Philadelphia.
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