Asclepias viridiflora
 
Green Milkweed

Single Stem

Oro Lake Regional Park
12-July-2010

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]