Erigeron arizonicus

A. Gray

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

Common names: Arizona fleabane
Synonyms: Erigeron rusbyi A. Gray
Treatment appears in FNA Volume 20. Treatment on page 332. Mentioned on page 268.

Perennials, 8–40 (–60) cm; rhizomatous, fibrous-rooted, caudices or rhizomes relatively thick, simple or branched, sometimes resembling a taproot. Stems erect to basally ascending, moderately to densely strigose to strigoso-hirsute or hirsute, eglandular. Leaves basal (commonly persistent) and cauline; basal blades often 3-nerved, spatulate, obovate to ovate, or elliptic, 20–150 × 5–25 mm, margins entire to shallowly serrate, faces loosely strigose, rarely minutely glandular; cauline blades slightly smaller than basal, relatively even-sized to peduncle bases, (bases subclasping) margins entire, becoming lanceolate (bases non-clasping) distally. Heads 1–4 (–6) (from branches on distal 1/3–1/2 of stem, peduncles distinct, 1.5–9 cm). Involucres 5–7 × 9–18 mm. Phyllaries in 3–4 series (greenish), moderately piloso-hirsute, densely minutely glandular (sometimes obscured by hairs). Ray-florets 25–80; corollas white, drying white or lilac-tinged, 8–10 mm (ca. 1 mm wide), laminae coiling at tips. Disc corollas 2.9–4 mm. Cypselae 1.6–2.1 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 15–26 bristles. 2n = 18.


Phenology: Flowering (May–)Jul–Sep(–Oct).
Habitat: Grassy slopes, openings, roadsides, sometimes rock crevices and ledges, oak-juniper to oak-pine, pine, pine-fir, Douglas fir, spruce-fir
Elevation: (1800–)2100–2900(–3200) m

Distribution

V20-757-distribution-map.gif

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

Discussion

Selected References

None.

Lower Taxa

None.

"thick" is not a number."thick" is not a number.

... more about "Erigeron arizonicus"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +, corymbiform +  and loose +
indeterminate +  and determinate +
Guy L. Nesom +
A. Gray +
2 cm20 mm <br />0.02 m <br /> (15 cm150 mm <br />0.15 m <br />) +
obovate +  and ovate or elliptic +
0.5 cm5 mm <br />0.005 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
decurrent +
linear;lanceolate oblanceolate or spatulate +
rugulose +  and muricate +
branched +  and simple +
equal-sized +  and slightly smaller +
Arizona fleabane +
not 2-lipped +  and actinomorphic +
lilac-tinged +, white +  and drying +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
subterete +, oblong +  and oblong-obovoid compressed +
fertile +  and bisexual +
0.29 cm2.9 mm <br />0.0029 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
fertile +  and bisexual +
Ariz. +, N.Mex. +  and Mexico (Sonora) +
(1800–)2100–2900(–3200) m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Grassy slopes, openings, roadsides, sometimes rock crevices and ledges, oak-juniper to oak-pine, pine, pine-fir, Douglas fir, spruce-fir +
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 />) +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
turbinate;hemispheric +
0.9 cm9 mm <br />0.009 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
petiolate +  and sessile +
cauline +  and basal +
erect;spreading +
deltate +
entire +  and shallowly serrate +
lanceolate +
Not (?) +  and Scarious (?) +
2-carpellate +
Flowering (May–)Jul–Sep(–Oct). +
3-nerved +  and 1-nerved +
piloso-hirsute +
narrowly elliptic +  and linear-lanceolate +
Proc. Amer. Acad. Arts +
bearing subulate enations +, hairy +  and bristly +
branched +  and simple +
exalbuminous +
prostrate +  and decumbent +
erect +  and basally ascending +
appendaged +  and truncate +
papillate +  and smooth +
Erigeron rusbyi +
Erigeron arizonicus +
Erigeron +
species +
inflated +  and tubular +
fibrous-rooted +  and rhizomatous +
40 cm400 mm <br />0.4 m <br /> (60 cm600 mm <br />0.6 m <br />) +
8 cm80 mm <br />0.08 m <br /> (40 cm400 mm <br />0.4 m <br />) +
tree +, shrub +  and subshrub +