Zizia aptera

Heart-leaved Alexander

Sheathing Petiole
North of Arcola
15-June-02

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Note that Budd's Flora keys family Umbelliferae as not having stipules.  However, the petioles are usually enlarged and sheathing the stem at the base.

 
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Umbelliferae Characteristics
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herbs

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plants terrestrial or semi-aquatic; leaves not submerged or floating

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plants with more than 1 leaf

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leaves without stipules, or having glands

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some or all leaves alternate