New York Natural Heritage Program
Silvery Aster
Symphyotrichum concolor var. concolor
Symphyotrichum concolor flowers Troy Weldy
Family: Aster Family (Asteraceae)

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: G5T5
A Global Rarity Rank of G5T5 means: Secure globally - Both the species as a whole and the subspecies/variety are common in the world; widespread and abundant (but may be rare in some parts of its range).

Did you know?
We are unsure of why this once common aster is so rare now. Plenty of suitable habitat apparantly remains, although many of its former sites on western Long Island and New York City have been developed.

State Ranking Justification [-]
There is only one known population on the verge of being extirpated. There are approximately 30 historical occurrences, but despite extensive searches only one occurrence has been seen. No other records of this conspicuous aster have been reported recently. There are probably only a few other occurrences in New York.

Short-term Trends [-]

Long-term Trends [-]