Asclepias viridiflora
 
Green Milkweed

Inflorescence Longitudinal Section

Oro Lake Regional Park
12-July-2010

The inflorescence was split in two lengthwise and one of the two halves is depicted here.  Note that Budd's Flora describes the inflorescence as an umbel.  Technically, the inflorescence is an umbellate cyme.

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Viridiflora: Answers to key questions in Budd's Flora and Flora of Alberta leading to this species. 
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umbels several; NOT [umbels solitary]

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umbels lateral; NOT [umbels terminal]

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corona hoods WITHOUT an incurved horn within

 

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Asclepiadaceae: Answers to key questions in Budd's Flora  leading to this family. 
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herbs; NOT [shrubs or trees]

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plants green or with some chlorophyll; NOT [plants parasitic or saprophytic, without chlorophyll]

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plants with milky juice

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flowers not in heads or spikes; NOT [flowers in long or short spikes], NOT [flowers in heads or in form resembling a head]

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flowers with two floral rings, but with the petals wholly or partly united forming a tube or bell

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corolla regular; NOT [corolla irregular]

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stamens united; NOT [stamens distinct]

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pollens grains united into a mass; NOT [pollen grains separate]

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styles distinct; NOT [styles united]

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ovary superior; NOT [ovary inferior]