Sunday, October 19, 2008

Spiny Sowthistle

Sowthistles are not true thistles. They are tall spiny leaved plants with flowers that look sort of like dandelions. The spiny sowthistle can be distinguished from other varieties by the way the leaves sort of curl around the stem. These plants can get to be six feet tall, and I find them rather pretty. They are not native but another plant that spread from Europe. They are now found in all of U.S. and Canada North America except for the arctic region. The scientific name is Sonchus asper.

1. poison ivy (Toxicodendron radicans) -native
2. red maple (Acer rubrum) -native
3. Virginia creeper (Parthenocissus quinquefolia) -native
4. staghorn sumac (Rhus typhina) -native
5. common dandelion (Taraxacum officinale) -not native
6. New England aster (Symphyotrichum novae-angliae) -native
7. Canada goldenrod (Solidago altissima) -native
8. catsear (Hypochaeris radicata) -not native
9. butter-and-eggs (Linaria vulgaris) -not native
10. meadow hawkweed (Pilosella caespitosa) -not native
11. spiny sowthistle (Sonchus asper) -not native

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