Erigeron linearis is a small clumping perennial herb reaching a maximum height of 20 centimeters, with a woody taproot. Its leaves are long and narrow, mostly clustered around the base of the stem, and are long, pale green to green, and lightly covered with short white hairs. The erect lightly hairy flower stems are leafless or have a few reduced linear leaves and usually produce only one flower head each about wide. The flower has a center of many golden yellowdisc florets and a fringe of as many as 38 pale to bright yellow or cream-colored ray florets. The fruit is an achene attached to a fluffy pappus with 10 to 20 bristles. Seeds are presumably wind dispersed.