Erigeron breweri

A. Gray

Proc. Amer. Acad. Arts 6: 541. 1866.

Common names: Brewer’s fleabane
IllustratedEndemic
Treatment appears in FNA Volume 20. Treatment on page 316. Mentioned on page 270, 315, 317.

Perennials, 7–75 cm; taprooted (taproots usually not collected, often weakly developed), roots and caudices woody, branches rhizomelike (3–15 cm; fibrous-rooted), relatively slender, leafless, ascending. Stems usually ascending, sometimes prostrate to procumbent or decumbent (var. jacinteus) (often purple, distal branches stiff, spreading-ascending), hispid (hairs spreading-deflexed, 0.1–0.4 mm), mostly eglandular. Leaves cauline; (ascending) blades narrowly oblong-lanceolate to narrowly obovate, 10–40 × 2–5 mm, margins entire, relatively evenly spaced and sized, hispid, mostly eglandular. Heads 1 or 2–5 (–10) in loosely corymbiform arrays. Involucres mostly 4–6 × 9–14 mm. Phyllaries in 3–5 series (all but outermost with stramineous margins and distal, greenish-herbaceous, narrowly rhomboid areas), strigoso to hispido-hirsute or essentially glabrous, densely minutely glandular. Ray-florets 20–62; corollas white or pink, often drying blue, 4–7 mm, laminae weakly coiling. Disc corollas 3.5–5.5 mm (throats slightly indurate, not inflated). Cypselae 2–3 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of (15–) 20–35 (–50) bristles.

Discussion

Varieties 5 (5 in the flora).

Erigeron breweri is treated as a member of E. sect. Linearifolii in G. L. Nesom (1992b), where all of the varieties are mapped in detail.

Selected References

None.

Key

1 Phyllaries glabrous or sparsely hairy, densely glandular > 2
1 Phyllaries strigoso- to hispido-hirsute, sometimes slightly glandular > 3
2 Plants usually 12–40 or 30–60 cm; stems ascending-erect; leaves usually 15–35 mm Erigeron breweri var. breweri
2 Plants 7–15 cm; stems prostrate to procumbent or decumbent; leaves 5–12 mm Erigeron breweri var. jacinteus
3 Plants 20–30 cm; stems often wiry and brittle; phyllaries hispido-hirsute (hairs translucent, spreading, stiff, relatively thick-based), glandular Erigeron breweri var. porphyreticus
3 Plants (30–)40–75 cm; stems not wiry or brittle; phyllaries strigoso- or hispido-hirsute (hairs ascending to ascending-appressed, white), eglandular > 4
4 Phyllaries strigoso-hirsute (hairs relatively thin-based, ascending-appressed, gradually and slightly reduced in density from outer to inner phyllaries), eglandular Erigeron breweri var. bisanctus
4 Phyllaries hispido-hirsute (hairs relatively thick-based, ascending, dense on outermost phyllaries, much less so on mid and inner), eglandular Erigeron breweri var. covillei
... more about "Erigeron breweri"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Guy L. Nesom +
A. Gray +
decurrent +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
narrowly oblong-lanceolate;narrowly obovate +
2mm;5mm +
rugulose +  and muricate +
leafless +  and rhizomelike +
slender +
Brewer’s fleabane +
not 2-lipped +  and actinomorphic +
blue +, pink +  and white +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
subterete +, oblong +  and oblong-obovoid compressed +
fertile +  and bisexual +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
fertile +  and bisexual +
Calif. +  and Nev. +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
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 />) +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
turbinate;hemispheric +
0.9 cm9 mm <br />0.009 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
petiolate +  and sessile +
erect;spreading +
deltate +
Not (?) +  and Scarious (?) +
2-carpellate +
3-nerved +  and 1-nerved +
glabrous +  and hispido-hirsute +
narrowly elliptic +  and linear-lanceolate +
Proc. Amer. Acad. Arts +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
Illustrated +  and Endemic +
prostrate +  and procumbent +
appendaged +  and truncate +
papillate +  and smooth +
Achaetogeron +  and Trimorpha +
Erigeron breweri +
Erigeron +
species +
inflated +  and tubular +
90 cm900 mm <br />0.9 m <br /> (100 cm1,000 mm <br />1 m <br />) +
7 cm70 mm <br />0.07 m <br /> (75 cm750 mm <br />0.75 m <br />) +
tree +, shrub +  and subshrub +