Asclepias viridis

Common Names: Green Milkweed, Antelope Horns

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corolla lobes are pale green and typically longer than those of Asclepias asperula

habit - low-spreading to sub-erect

typical of flowers in the Asclepiadaceae, stamens have hoods leaf blades are typically wider than those of Asclepias asperula
the combined structure of stamens and pistils is called the gynostegium  
What type of inflorescence is this?