Sarcostemma cynanchoides Decne. subsp. hartwegii (Vail) R.W.Holm

As mentioned under the nominate subspecies, taxonomy in complicated here. B.L. Turner (Phytologia 90: 36-40) split the two subspecies of Funastrum cynanchoides (cynanchoides and hartwegii) into two separate species, but his treatment is totally unworkable and nearly incoherent when applied to plants in New Mexico. Barring further insight into these taxa, I am simply calling those with fairly wide leaves "subsp. cynanchoides" and those with very narrow leaves "subsp. hartwegii". Both can be found as weedy vines in Las Cruces.

An inflorescence below Texas Canyon, eastern Organ Mountains, Doña Ana County, New Mexico, 15 May 2010.

A longitudinally-sectioned flower on the New Mexico State University campus in Las Cruces, Doña Ana County, New Mexico, 18 Oct 2013.

Abaxial view of a flower on the NMSU campus, 18 Oct 2013.

An inflorescence near Tortugas Mountain, Doña Ana County, New Mexico, 25 Sep 2004.

Developing fruit with aphids, near Tortugas Mountain, 25 Sep 2004.

Plant habit near Tortugas Mountain, 25 Sep 2004.

Cauline leaves near Tortugas Mountain, 25 Sep 2004.