New York Natural Heritage Program
Northern Bog Violet
Viola nephrophylla Greene
Dicots
Family: Violet Family (Violaceae)

State Protection: Endangered
listed species are those with: 1) 5 or fewer extant sites, or 2) fewer than 1,000 individuals, or 3) restricted to fewer than 4 U.S.G.S. 7 minute topographical maps, or 4) species listed as endangered by U.S. Department of Interior.

Federal Protection: Not Listed

State Rarity Rank: S1
A State Rarity Rank of S1 means: This plant is endangered/critically imperiled in New York because of extreme rarity (typically 5 or fewer populations or very few remaining individuals) or is extremely vulnerable to extirpation from New York due to biological factors.

Global Rarity Rank: G5
A Global Rarity Rank of G5 means: This species is demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.


Did you know?
The species name "nephrophylla" means kidney-leaf, and refers to the shape of the basal leaves. Like most violets, this species produces "cleistogamous", meaning closed flowers as well as the familiar purple violet blossoms. These easily overlooked cleistogamous flowers never open and have no petals, and look like small bumps on the stems. They produce seeds by self-fertilization.

State Ranking Justification [-]
There are only 4 verified occurrences and 7 historical occurrences known from New York. Only 2 of the verified occurrences are ranked as better than "fair". The historical occurrences date from the early 1900s, and most sites have never been re-checked.

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