Erigeron neomexicanus

A. Gray

Proc. Amer. Acad. Arts 19: 2. 1883.

Common names: New Mexico fleabane
Synonyms: Erigeron delphiniifolius var. euneomexicanus Cronquist Erigeron delphiniifolius subsp. neomexicanus (A. Gray) Cronquist
Treatment appears in FNA Volume 20. Treatment on page 277. Mentioned on page 259, 262, 278, 334.

Perennials, 20–70 cm; taprooted, caudices woody. Stems erect, moderately to densely strigose (hairs appressed to ascending, 0.1–0.8(–2) mm, sometimes spreading at bases or throughout), eglandular or glands minute, non-capitate. Leaves basal (sometimes persistent) and cauline; blades oblanceolate, margins usually deeply pinnatifid (lobes in 2–5 pairs), sometimes dentate to entire, faces strigose, eglandular; basal 10–60 × 6–35 mm, cauline gradually reduced distally. Heads (1–)5–15(–30) in loosely corymbiform arrays. Involucres 3.5–5 × 7–12 mm. Phyllaries in 3–4 series, strigose to hirsute (hairs arising mostly from midregion), usually minutely glandular, rarely eglandular. Ray florets 70–150; corollas white, drying white, (2–)6–15 mm, laminae reflexing. Disc corollas 2.5–3.3 mm (throats somewhat white-indurate, not inflated). Cypselae 1–1.3 mm, 2(–4)–nerved, faces sparsely strigose; pappi: (outer 0) inner (readily falling) of (8–)10–12 bristles. 2n = 18, 36.

Phenology: Flowering (Jul–)Aug–Oct(–Dec).
Habitat: Open, rocky sites, from grasslands into oak or pine woodlands, often with madrono, juniper, or fir
Elevation: (900–)1500–2700(–3000) m



Ariz., N.Mex., Mexico (Chihuahua, Sonora).


Relatively large, pinnatifid leaves are typical of Erigeron neomexicanus; plants with nearly entire leaves can be identified by the strongly perennial habit, white, reflexing rays, and 10–12 readily falling pappus bristles. Erigeron neomexicanus and E. oreophilus were treated by A. Cronquist (1947) as varieties of one species, and their morphologic similarity and the closeness of their geographic ranges support that hypothesis. But relatively few collections are found that could be regarded as intermediates, and both forms sometimes grow in proximity, apparently without a range of intermediates. In some Arizona mountain ranges, apparently only one or the other taxon occurs. Still, the possibility exists that these are populational segregants of a single species (see further comments in G. L. Nesom 1989d).

Selected References


Lower Taxa

... more about "Erigeron neomexicanus"
Guy L. Nesom +
A. Gray +
New Mexico fleabane +
Ariz. +, N.Mex. +, Mexico (Chihuahua +  and Sonora). +
(900–)1500–2700(–3000) m +
Open, rocky sites, from grasslands into oak or pine woodlands, often with madrono, juniper, or fir +
Flowering (Jul–)Aug–Oct(–Dec). +
Proc. Amer. Acad. Arts +
Illustrated +
Erigeron delphiniifolius var. euneomexicanus +  and Erigeron delphiniifolius subsp. neomexicanus +
Erigeron neomexicanus +
Erigeron +
species +