New York Natural Heritage Program
Oakes' Evening-primrose
Oenothera oakesiana (Gray) J.W. Robbins ex S. Wats. & Coult.
Oenothera oakesiana in flower Stephen M. Young
Family: Evening-Primrose Family (Onagraceae)

State Protection: Threatened
listed species are those with: 1) 6 to fewer than 20 extant sites, or 2) 1,000 to fewer than 3,000 individuals, or 3) restricted to not less than 4 or more than 7 U.S.G.S. 7 ˝ minute topographical maps, or 4) listed as threatened by U.S. Department of Interior.

Federal Protection: Not Listed

State Rarity Rank: S2
A State Rarity Rank of S2 means: This plant is threatened/imperiled in New York because of rarity (typically 6-20 populations or few remaining individuals) or is vulnerable to extirpation from New York due to biological factors.

Global Rarity Rank: G4G5Q
A Global Rarity Rank of G4G5Q means: Apparently or Demonstrably Secure globally - Uncommon to common in the world, but not rare; usually widespread, but may be rare in some parts of its range; possibly some cause for long-term concern due to declines or other factors. More information is needed to assign a single conservation status. The Q indicates this species’ status as a distinctive full species is uncertain.

Did you know?
The species name honors William Oakes (1799-1848), a famous New England botanist who first collected this plant. His career was cut short when he fell overboard from a ferry boat between Boston and East Boston and drowned. His name was used for another New York rare plant, Oakesia conradii, which later was changed to Corema conradii.

State Ranking Justification [-]
There are six existing populations but only two of them have more than 100 plants. Their locations are in disturbed areas which may have a larger effect on population sizes from year to year. There are 26 historical occurrences but many of these have probably been extirpated by development of the open sandy areas.

Short-term Trends [-]

Long-term Trends [-]