Asclepias galioides

I've seen this species a few times in southwestern New Mexico and southeastern Arizona in low wet areas near stock ponds and roadside ditches.

Inflorescence and developing fruit near Cotton City along NM 380 in Hidalgo Co., NM, 9/18/04.

Closer view of an inflorescence near a stock pond in the flats on the east side of the Chiricahua Mts., 9/6/04.