New York Natural Heritage Program
Swamp Sunflower
Helianthus angustifolius L.
Helianthus angustifolius plant David Smith
Family: Aster Family (Asteraceae)

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: 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?
This species has the most narrow leaves of any member of the sunflower genus in the northeastern United States. It is also the only one that grows in salt marshes.

State Ranking Justification [-]
There are seven existing populations but many of them are threatened due to displacement by Phragmites. There are 31 historical occurrences. Most of them have been resurveyed but no plants were found.

Short-term Trends [-]

Long-term Trends [-]