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Symphyotrichum chilensisÌý(Nees) G. L. Nesom is native to along the Pacific coast from Vancouver Island south to southern California in grasslands, salt marshes, coastal dunes and bluffs, coastal grasslands and scrub, open disturbed habitats in evergreen and Pacific coast coniferous forests. The species has long rhizomes and the outer phyllaries are obtuse (usually shorter than inner); fruits 3.5–4.5m. In comparison, the outer phyllaries of S. subspicatum are usually acute and often nearly as long as the inner phyllaries. Ray florets are violet. The species includes hexaploids (2n=48) and octoploids (2n=64) individuals and rarely duodecaploids (2n=96).

The species was erroneously thought by Nees to occur in Chile. The plants named Aster chilensis var. medius Jepson are hybrids of S. chilense and S. lentum.