Erigeron nivalis

Nuttall

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

IllustratedEndemic
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

Distribution

V20-723-distribution-map.gif

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

Discussion

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

None.

Lower Taxa

None.
... more about "Erigeron nivalis"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Guy L. Nesom +
Nuttall +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
2 cm20 mm <br />0.02 m <br /> (6 cm60 mm <br />0.06 m <br />) +
oblanceolate +  and spatulate +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
decurrent +
linear;lanceolate oblanceolate or spatulate +
rugulose +  and muricate +
short-rhizomatous +, branched +  and simple +
not 2-lipped +  and actinomorphic +
white +  and pinkish +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
subterete +, oblong +  and oblong-obovoid compressed +
fertile +  and bisexual +
0.44 cm4.4 mm <br />0.0044 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
fertile +  and bisexual +
Alta. +, B.C. +, N.W.T. +, Yukon +, Alaska +, Calif. +, Colo. +, Idaho +, Mont. +, N.Mex. +, Oreg. +, Utah +, Wash. +  and Wyo. +
1200–3700 m +
strigose +  and hirsuto-strigose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Rocky sites, gravel bars and banks, roadsides, meadows, open woods, up to subalpine areas with spruce in Rocky Mountains +
disciform +  and discoid +
in loose , corymbiform or paniculiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
fewer +  and many +
0.5 cm5 mm <br />0.005 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
turbinate;hemispheric +
0.8 cm8 mm <br />0.008 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
reflexing +  and erect +
not coiling +
petiolate +  and sessile +
cauline +  and basal +
erect;spreading +
deltate +
rarely +  and entire +
Not (?) +  and Scarious (?) +
2-carpellate +
Flowering May–Aug. +
3-nerved +  and 1-nerved +
glabrous +  and hirsuto-villous +
narrowly elliptic +  and linear-lanceolate +
Trans. Amer. Philos. Soc., n. s. +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
Illustrated +  and Endemic +
branched +  and simple +
prostrate +  and decumbent +
erect +  and basally ascending +
appendaged +  and truncate +
papillate +  and smooth +
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 +
inflated +  and tubular +
shallow +
fibrous-rooted +  and taprooted +
25 cm250 mm <br />0.25 m <br /> (35 cm350 mm <br />0.35 m <br />) +
perennial +, short-lived +  and biennial +
5 cm50 mm <br />0.05 m <br /> (25 cm250 mm <br />0.25 m <br />) +
tree +, shrub +  and subshrub +