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Purple Milkweed Asclepias purpurascens L. |
Dicots |  Printer Friendly Version (PDF) |
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 the 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: 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. |
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| 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 | [-] |
Most populations are below 30 plants and grow in areas that are susceptible to succession and invasive species. Most of the populations occur in the Lower Hudson region which is developing rapidly. These factors probably forecast a short-term decline. Fortunately a large population was recently found in Orange County and there is hope that more populations can be found in the area.
| Long-term Trends | [-] |
The long-term trend has been declining in the last 100 years as areas in the Lower Hudson region and Long Island have been developed. There were 22 historical locations but many of these have been extirpated by development.
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Home | Advanced Search | About Us Animal Guides | Plant Guides | Community Guides © 2004-2012 New York Natural Heritage Program, a partnership between the New York State Department of Environmental Conservation and the State University of New York College of Environmental Science and Forestry Please cite this page as:
New York Natural Heritage Program. 2013. Online Conservation Guide for Asclepias purpurascens. Available from: http://www.acris.nynhp.org/guide.php?id=8728. Accessed May 22nd, 2013. 
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