Erigeron nivalis Nutt.

Erigeron nivalis usually has been treated as an infra-specific taxon within E. acris; the two are broadly sympatric in the northwestern United States and Canada without obvious intergrades. Both occur over a wide range of elevations and in similar habitats. Erigeron nivalis probably occurs in Nevada; it has not been taxonomically distinguished there. Erigeron scotteri was regarded by E. H. Moss and J. G. Packer (1983) as a synonym of E. acris (presumably var. debilis = E. nivalis; the heads are relatively small and borne singly).

Biennials or short-lived perennials, 5–25(–35) cm; usually fibrous-rooted, sometimes taprooted, caudices simple or branched, sometimes weakly short-rhizomatous. Stems erect to basally ascending, sometimes sparsely hirsuto-villous, minutely glandular. Leaves basal (persistent) and cauline (petiole margins coarsely ciliate); basal blades oblanceolate to spatulate, 20–60 × 2–6(–10) mm, cauline gradually reduced distally, margins entire or rarely with 1–2 pairs of shallow teeth, faces sparsely hirsuto-strigose, eglandular. Heads 1–6(–8) in corymbiform arrays (on curved-ascending peduncles). Involucres 5–6 × 8–11 mm. Phyllaries in 2–3(–4) series (inner apices attenuate to caudate), sparsely hirsuto-villous or glabrous, minutely glandular. Ray (pistillate) florets in 2 series; outer 40–70, corollas white to pinkish 5.5–7 mm, laminae (filiform) erect, not coiling or reflexing; inner many fewer than outer series, tubular, elaminate. Disc corollas 4.4–5.5 mm. Cypselae 2–2.3 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of (12–)14–21 (accrescent) bristles. 2n = 18.

Erigeron acris subsp. debilis (A. Gray) Piper; E. acris Linnaeus var. debilis A. Gray; E. angulosus Gaudin subsp. debilis (A. Gray) Piper; E. debilis (A. Gray) Rydberg; E. elatus (Hooker) Greene var. bakeri Greene; E. jucundus Greene; E. scotteri B. Boivin; Trimorpha acris (Linnaeus) Gray var. debilis (A. Gray) G. L. Nesom

Erigeron nivalis is a North American species of flowering plant in the family Asteraceae, called the northern daisy. It is widespread across much of western North America from Alaska east to Northwest Territories and south as far as California and New Mexico.

Erigeron nivalis is a biennial or perennial herb up to 35 centimeters (14 inches) tall. The plant generally produces 1-8 flower heads per stem, each head with up to 70 white or pink ray florets surrounding numerous yellow disc florets. The species grows in rocky sites and meadows in open woods and subalpine areas.