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The Teasel family is not native to our country, but a few plants, particularly teasel, have become widely naturalized here. The flower heads could easily be mistaken for those of the Aster Family. The individual flowers are bisexual and slightly irregular, clustered in a dense head. There are 5 sepals and 4 or 5 united petals, plus 4 stamens. The ovary is positioned inferior and consists of 2 united carpels (bicarpellate), but aborts one, forming just 1 chamber. It produces a dry seed (an achene) enclosed in a sac. Worldwide, there are 12 genera and 350 species. Three genera were introduced from Europe, including the cultivated pin cushion flower (Scabiosa).
Key Words: Aster-like blossoms with slightly irregular flowers.
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