Marah gilensis Greene

It's a perennial, climbing cucurbit with round, prickly, many-seeded fruits.

Staminate inflorescence and cauline leaves, East side of the Baboquivari Mountains below Baboquivari Peak, Pima County, Arizona, 20 Mar 2005.

Plant habit, 20 Mar 2005.

Staminate flower, 20 Mar 2005.