Erigeron neomexicanus

A. Gray

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

Common names: New Mexico fleabane
Illustrated
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, noncapitate. 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

Distribution

V20-561-distribution-map.gif

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

Discussion

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

None.

Lower Taxa

None.
... more about "Erigeron neomexicanus"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Guy L. Nesom +
A. Gray +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
decurrent +
oblanceolate +
rugulose +  and muricate +
New Mexico fleabane +
not 2-lipped +  and actinomorphic +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
subterete +, oblong +  and oblong-obovoid compressed +
fertile +  and bisexual +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.33 cm3.3 mm <br />0.0033 m <br />) +
fertile +  and bisexual +
Ariz. +, N.Mex. +, Mexico (Chihuahua) +  and Mexico (Sonora) +
(900–)1500–2700(–3000) m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Open, rocky sites, from grasslands into oak or pine woodlands, often with madrono, juniper, or fir +
noncapitate +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
spreading +, appressed +  and ascending +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
disciform +  and discoid +
in loose , corymbiform or paniculiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
turbinate;hemispheric +
0.7 cm7 mm <br />0.007 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
petiolate +  and sessile +
cauline +  and basal +
erect;spreading +
deltate +
dentate +  and entire +
pinnatifid +
not +  and scarious +
2-carpellate +
Flowering (Jul–)Aug–Oct(–Dec). +
strigose +  and hirsute +
narrowly elliptic +  and linear-lanceolate +
Proc. Amer. Acad. Arts +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
Illustrated +
branched +  and simple +
prostrate +  and decumbent +
appendaged +  and truncate +
papillate +  and smooth +
Erigeron delphiniifolius var. euneomexicanus +  and Erigeron delphiniifolius subsp. neomexicanus +
Erigeron neomexicanus +
Erigeron +
species +
inflated +  and tubular +
90 cm900 mm <br />0.9 m <br /> (100 cm1,000 mm <br />1 m <br />) +
20 cm200 mm <br />0.2 m <br /> (70 cm700 mm <br />0.7 m <br />) +
tree +, shrub +  and subshrub +