Zizia aptera

Heart-leaved Alexander

North of Arcola
15-June-2002

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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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Aptera Characteristics
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some basal leaves simple and cordate, not divided into 3 leaflets

 
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Zizia Characteristics
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foliage not spiny

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foliage not digitately compound

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leaves simple or divided into a few well-defined leaflets; not having leaves much divided into numerous segments or leaflets

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leaves simple or with 3 leaflets

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leaves serrate to trifoliate; not simple, entire

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leaves not entire; the lowest simple, cordate at base, and toothed; the upper ones commonly ternate.  (This is from Flora of Alberta.  Note that Zizia aurea, found in the eastern Prairies and Parkland, has all leaves twice or three times divided.)

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leaflets much less than 10 cm wide

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inflorescence not bluish

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flowers yellow

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rays of umbel rather even in length

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fruit not spiny

 
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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 not with colored milky juice

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stems hollow

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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

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flowers with 2 floral rings, and with each petal distinct from the others

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flowers in umbels

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parts of flowers mostly in fives

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calyx regular

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5 stamens alternating with the petals

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2 styles

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ovary inferior, flowers epigynous

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ovules and seeds 1 in each locule

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fruit dry, splitting at maturity