Edit History
Erigeron subtrinervis Rydberg ex Porter & Britton [family COMPOSITAE]
Date Updated: 23 July 2012
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 20,
Names
Erigeron subtrinervis Rydberg ex Porter & Britton [family COMPOSITAE], Mem. Torrey Bot. Club, 5: 328. 1894
Erigeron glabellus Nuttall var. mollis A. Gray [family COMPOSITAE], Proc. Acad. Nat. Sci. Philadelphia, 15: 64. 1864,. not E. mollis D. Don 1825
Erigeron speciosus (Lindley) de Candolle var. mollis (A. Gray) S. L. Welsh [family COMPOSITAE]
Treatment Author(s)
Guy L. Nesom
Information
Perennials, 15–90 cm; rhizomatous to subrhizomatous, fibrous-rooted, caudices usually branched, woody, thick. Stems erect, moderately to densely hirsute (hairs 0.5–0.8 mm), eglandular. Leaves basal (usually withering by flowering) and cauline; basal blades oblanceolate-spatulate, 30–80 × 6–20(–27) mm, margins entire, faces evenly hirsute to strigoso-hirsute, usually eglandular; cauline blades lanceolate to oblong, oblong-ovate, or broadly ovate, nearly even-sized distally or sometimes mid largest (continuing to immediately proximal to heads, bases clasping to subclasping). Heads 1–6(–21) in corymbiform arrays. Involucres 6–9 × 13–20 mm. Phyllaries in 2–3(–4) series, moderately to densely hirsute, minutely glandular. Ray florets 100–150; corollas blue to lavender, 7–18 mm (ca. 1 mm wide), laminae coiling at tips. Disc corollas 4–5 mm. Cypselae 1.6–2 mm, 2(–4)-nerved, faces sparsely strigose; pappi: outer of setae, inner of 20–30 bristles.
Phenology
jun-aug (summer), sep (fall)
Altitude range
1800–3000(–3500) m;
Distribution
USA Colo.USA IdahoUSA Mont.USA Nebr.USA N.Mex.USA N.Dak.USA S.Dak.USA UtahUSA Wyo.
Discussion
Erigeron subtrinervis is variable in vestiture, perhaps reflecting gene exchange with E. speciosus. Erigeron speciosus var. mollis (A. Gray) S. L. Welsh may be a recurrent hybrid; it is identified here within E. subtrinervis.
Date Updated: 23 July 2012
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 20,
Names
Erigeron subtrinervis Rydberg ex Porter & Britton [family COMPOSITAE], Mem. Torrey Bot. Club, 5: 328. 1894
Erigeron glabellus Nuttall var. mollis A. Gray [family COMPOSITAE], Proc. Acad. Nat. Sci. Philadelphia, 15: 64. 1864,. not E. mollis D. Don 1825
Erigeron speciosus (Lindley) de Candolle var. mollis (A. Gray) S. L. Welsh [family COMPOSITAE]
Treatment Author(s)
Guy L. Nesom
Information
Perennials, 15–90 cm; rhizomatous to subrhizomatous, fibrous-rooted, caudices usually branched, woody, thick. Stems erect, moderately to densely hirsute (hairs 0.5–0.8 mm), eglandular. Leaves basal (usually withering by flowering) and cauline; basal blades oblanceolate-spatulate, 30–80 × 6–20(–27) mm, margins entire, faces evenly hirsute to strigoso-hirsute, usually eglandular; cauline blades lanceolate to oblong, oblong-ovate, or broadly ovate, nearly even-sized distally or sometimes mid largest (continuing to immediately proximal to heads, bases clasping to subclasping). Heads 1–6(–21) in corymbiform arrays. Involucres 6–9 × 13–20 mm. Phyllaries in 2–3(–4) series, moderately to densely hirsute, minutely glandular. Ray florets 100–150; corollas blue to lavender, 7–18 mm (ca. 1 mm wide), laminae coiling at tips. Disc corollas 4–5 mm. Cypselae 1.6–2 mm, 2(–4)-nerved, faces sparsely strigose; pappi: outer of setae, inner of 20–30 bristles.
Phenology
jun-aug (summer), sep (fall)
Altitude range
1800–3000(–3500) m;
Distribution
USA Colo.USA IdahoUSA Mont.USA Nebr.USA N.Mex.USA N.Dak.USA S.Dak.USA UtahUSA Wyo.
Discussion
Erigeron subtrinervis is variable in vestiture, perhaps reflecting gene exchange with E. speciosus. Erigeron speciosus var. mollis (A. Gray) S. L. Welsh may be a recurrent hybrid; it is identified here within E. subtrinervis.
╳
We're sorry. You don't appear to have permission to access the item.
Full access to these resources typically requires affiliation with a partnering organization. (For example, researchers are often granted access through their affiliation with a university library.)
If you have an institutional affiliation that provides you access, try logging in via your institution
Have access with an individual account? Login here
If you would like to learn more about access options or believe you received this message in error, please contact us.