# Western Antelope Horns

*Asclepias asperula subsp. asperula* (Decne.) Woodson

The western antelope horns, of mountain and mesa country from the Great Basin to the Trans-Pecos, and south in Mexico as far as Oaxaca.

## How to tell it apart

Leaves are narrower, almost linear, and longer, to 17 cm. The flower stalk is long, up to 22 cm, and the pods are smooth rather than warty. Crown segments are reddish-purple with a white upper edge.

## Where it grows

A high-country plant, 700 to 2,800 m. Within the United States it only just reaches California, Idaho and Oklahoma, each at a single county, and in Texas it is confined to the Trans-Pecos.

States: AZ, CA, CO, ID, NM, NV, OK, TX, UT

## Other names

Asclepias capricornu subsp. occidentalis

Source: Flora of North America vol. 14 (2023).