New York Natural Heritage Program
Purple Milkweed
Asclepias purpurascens L.
Asclepias purpurascens flowers Stephen M. Young
Family: Milkweed Family (Asclepiadaceae)

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: S2S3
A State Rarity Rank of S2S3 means: Imperiled or Vulnerable in New York - Very vulnerable to disappearing from New York, or vulnerable to becoming imperiled in New York, due to rarity or other factors; typically 6 to 80 populations or locations in New York, few individuals, restricted range, few remaining acres (or miles of stream), and/or recent and widespread declines. More information is needed to assign a single conservation status.

Global Rarity Rank: G5?
A Global Rarity Rank of G5? means: Secure globally (most likely) - Conservation status is uncertain, but most likely common in the world; widespread and abundant (but may be rare in some parts of its range). More information is needed to assign a firm conservation status.

Did you know?
Purple milkweed almost always occurs in small populations with fewer than one hundred plants. New York has the largest population in the nation with over 1000 plants.

State Ranking Justification [-]
There are ten existing populations and 22 historical occurrences. The populations at all but one site are fewer than 30 plants. The New York sites are in areas that are being developed rapidly and have come under threat by invasive species.

Short-term Trends [-]

Long-term Trends [-]