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Green Milkweed Asclepias viridiflora Raf. |
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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: This species is demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery. Did you know? The green milkweed plants on Long Island are the easternmost populations in the United States. This is the only milkweed in New York with drooping pincushions of many green flowers. |
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| State Ranking Justification | [-] |
This milkweed is limited to serpentine and calcareous rocks in southeastern New York where it reaches its northern limit. Many of the populations are threatened by development, the spread of various invasive plants, and uncontrolled natural succession typically due to fire suppression. There are 14 known populations with half of these containing ten or fewer plants. With no additional populations expected and the threats mentioned above, we fear that the number of known populations will decrease over time.
| Short-term Trends | [-] |
This milkweed has always been rare in New York. Most of the known populations seem stable, but there are some locations with low numbers of plants that need to be resurveyed.
| Long-term Trends | [-] |
The number of known populations of this plant in New York has been relatively constant over time with a few historical sites disappearing and a few new sites discovered.
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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 viridiflora. Available from: http://acris.nynhp.org/guide.php?id=8733. Accessed June 20th, 2013. 
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