Difference between revisions of "Erigeron nivalis"
Trans. Amer. Philos. Soc., n. s. 7: 311. 1841.
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|elevation=1200–3700 m | |elevation=1200–3700 m | ||
|distribution=Alta.;B.C.;N.W.T.;Yukon;Alaska;Calif.;Colo.;Idaho;Mont.;N.Mex.;Oreg.;Utah;Wash.;Wyo. | |distribution=Alta.;B.C.;N.W.T.;Yukon;Alaska;Calif.;Colo.;Idaho;Mont.;N.Mex.;Oreg.;Utah;Wash.;Wyo. | ||
| − | |discussion=<p><i>Erigeron nivalis</i> usually has been treated as an infra-specific taxon within <i>E. acris</i>; 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. <i>Erigeron nivalis</i> probably occurs in <i>Nevada</i>; it has not been taxonomically distinguished there. <i>Erigeron</i> scotteri was regarded by E. H. Moss and J. G. Packer (1983) as a synonym of <i>E. acris</i> (presumably <i></i>var.<i> debilis</i> = <i>E. nivalis</i>; the heads are relatively small and borne singly).</p> | + | |discussion=<p><i>Erigeron nivalis</i> usually has been treated as an infra-specific taxon within <i>E. acris</i>; 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. <i>Erigeron nivalis</i> probably occurs in <i>Nevada</i>; it has not been taxonomically distinguished there. <i>Erigeron</i> scotteri was regarded by E. H. Moss and J. G. Packer (1983) as a synonym of <i>E. acris</i> (presumably <i></i></i>var.<i><i> debilis</i> = <i>E. nivalis</i>; the heads are relatively small and borne singly).</p> |
|tables= | |tables= | ||
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|publication year=1841 | |publication year=1841 | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V20_723.xml |
|tribe=Asteraceae tribe Astereae | |tribe=Asteraceae tribe Astereae | ||
|genus=Erigeron | |genus=Erigeron | ||
Revision as of 18:44, 24 September 2019
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
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.