Viola lanceolata
Viola lanceolata, commonly known as lance-leaved violet or bog white violet, is a small group of stemless white-flowered violets. It is an ornamental plant in the Violaceae family, part of the genus Viola. It gets its name from its lanceolate leaf shape and from the habitats in which it thrives. Distribution
Viola lanceolata originates from North America and can be found in many states in the United States and in Canada. Its native status is L48 (N), CAN (N), and SPM (N). Habitat and ecology
Viola lanceolata can be found growing in bogs, swamps, wet meadows and along shores in sandy soil. It is a perennial plant that blooms between May and June. Viola lanceolata frequently hybridizes with northern white violet (Viola macloskeyi) to form primrose-leaved violet (Viola primulifolia). It grows in similar habitats but has leaves intermediate between lance shaped and the typical heart-shaped violet leaves of northern white violet. Morphology

The overall plant is  tall and has narrow, lance-shaped leaves. These leaves are sometimes wider in the summer than in the spring and have generally smooth surfaces. Its stem is smooth and slender. Its flower contain 5 white petals located at the top of the stalk. The bottom three petals typically have purple veins. This plant spreads with root-like structures that grow over the surface of the ground (stolons). Its growth habit is a forb/herb. Fruits
The fruit that it bears are green elliptical shaped capsules about a quarter-inch long containing many small round seeds that ripen to dark brown. References

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lanceolata
Flora of Eastern Canada
Plants described in 1753
Taxa named by Carl Linnaeus
Flora of the Northeastern United States
Flora of the Southeastern United States
Flora of the North-Central United States
Flora of Texas
Flora of Oregon
Flora of Washington (state)
Flora of British Columbia
Flora without expected TNC conservation status