Asclepias speciosa Torr.
A common species in the eastern United States, somewhat uncommon in the western United States, where it is found in low-elevation cienegas and similar wet habitats.
Plant habit at Wagon Mound Cienega, Mora County, New Mexico, 7 Aug 2011.
Immature fruit at Wagon Mound Cienega, 7 Aug 2011.
An upper cauline leaf at Wagon Mound Cienega, 7 Aug 2011.