Basionym Symphyotrichum spathulatum (formerly Aster spathulatus) is a species of flowering plant in the family Asteraceae native to western North America including northwestern Mexico.

Commonly known as western mountain aster, it is a perennial, herbaceous plant that may reach 20 to 80 centimeters (8 to 31 inches) tall.

The leaves are linear or elliptical, narrow, and sometimes obovate at the base of the plant.

These surround the flower centers composed of 30–80 (sometimes up to 100) yellow disk florets.

[2] It grows at 1,200–2,900 meters (3,900–9,500 feet) (or lower) in meadows on mountain slopes and open aspen and coniferous forests.

It grows at 1,200–2,200 m (3,900–7,200 ft) in grasslands and meadows on mountain slopes and in open coniferous forests.

[15] As of July 2021[update], NatureServe listed Symphyotrichum spathulatum as Secure (G5) worldwide and Possibly Extirpated (SX) in Alberta.