Symphyotrichum ericoides (L.) G.L.Nesom

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Symphyotrichum ericoides (formerly Aster ericoides), known as white heath aster, frost aster, or heath aster, is a species of flowering plant in the family Asteraceae native to much of central and eastern North America. It has been introduced to parts of Europe and western Asia.

The naturally-occurring hybrid species of white heath aster and New England aster (Symphyotrichum novae-angliae) is named Symphyotrichum × amethystinum and is commonly known as amethyst aster. It can grow where the two parents are in close proximity.

Heath aster is a perennial herbaceous plant with stems from 30 to 91 centimeters (1 to 3 feet) tall. Its leaves are sessile (stalkless) and narrow, becoming smaller towards the top of the plant and tips of the branching stem. It has white (rarely pinkish), composite flowerheads with yellow centers that begin flowering in late summer and last through fall. They are 8 to 10 millimeters (1⁄3 to 1⁄2 inch) across.

It is commonly confused with Symphyotrichum pilosum, which co-occurs throughout most of its range. S. pilosum has larger flowerheads with longer ray petals. The phyllaries on S. pilosum are spine-tipped, while those of S. ericoides are not, although the curled edges may make them appear to be.

Symphyotrichum ericoides - Wikipedia

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