Erigeron nivalis


Trans. Amer. Philos. Soc., n. s. 7: 311. 1841.

Synonyms: Erigeron acris subsp. debilis (A. Gray) Piper Erigeron acris var. debilis A. Gray Erigeron angulosus subsp. debilis (A. Gray) Piper Erigeron debilis (Hooker) Greene Erigeron elatus var. bakeri Greene Erigeron jucundus B. Boivin Erigeron scotteri (Linnaeus) Gray Trimorpha acris var. debilis (A. Gray) G. L. Nesom
Treatment appears in FNA Volume 20. Treatment on page 322. Mentioned on page 265.

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.

Phenology: Flowering May–Aug.
Habitat: Rocky sites, gravel bars and banks, roadsides, meadows, open woods, up to subalpine areas with spruce in Rocky Mountains
Elevation: 1200–3700 m



Alta., B.C., N.W.T., Yukon, Alaska, Calif., Colo., Idaho, Mont., N.Mex., Oreg., Utah, Wash., Wyo.


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).

Selected References


Lower Taxa

... more about "Erigeron nivalis"
Guy L. Nesom +
Nuttall +
Alta. +, B.C. +, N.W.T. +, Yukon +, Alaska +, Calif. +, Colo. +, Idaho +, Mont. +, N.Mex. +, Oreg. +, Utah +, Wash. +  and Wyo. +
1200–3700 m +
Rocky sites, gravel bars and banks, roadsides, meadows, open woods, up to subalpine areas with spruce in Rocky Mountains +
Flowering May–Aug. +
Trans. Amer. Philos. Soc., n. s. +
Illustrated +  and Endemic +
Erigeron acris subsp. debilis +, Erigeron acris var. debilis +, Erigeron angulosus subsp. debilis +, Erigeron debilis +, Erigeron elatus var. bakeri +, Erigeron jucundus +, Erigeron scotteri +  and Trimorpha acris var. debilis +
Erigeron nivalis +
Erigeron +
species +