Erigeron elegantulus |
Erigeron howellii |
|
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dwarf blue fleabane, volcanic fleabane |
Howell's fleabane |
|
Habit | Plants perennial, 4–10 cm; taprooted, with branching caudices. | Plants perennial, 20–45 cm; fibrous-rooted, rhizomatous, caudices branching or not. |
Stems | erect to basally ascending, sparsely to moderately strigose, eglandular. |
erect, glabrous to sparsely and minutely strigillose, eglandular. |
Basal leaves | persistent, linear to filiform, 20–50 × 0.5–1 mm, white, bases sheathing; margins entire; tips round to acute or acuminate; surfaces sparsely to moderately strigose. |
persistent, broadly spatulate, 40–150 × 10–35 mm; margins entire or with few large teeth; surfaces glabrous, eglandular. |
Cauline leaves | abruptly reduced and usually restricted to basal ? of stem, bases sheathing. |
lanceolate to elliptic, 15–80 × 10–35 mm, gradually reduced distally; margins entire or with few coarse teeth; surfaces often ciliate or glandular. |
Involucres | 3–5 × 8–11 mm. |
5–9 × 15–23 mm. |
Ray florets | 15–30, lavender to purple; rays 3–8 × 0.7–1.3 mm. |
25–50, white; rays 8–20 × 2.5–4 mm. |
Disc florets | corollas 2.5–3.5 mm. |
corollas 4–5 mm. |
Phyllaries | in 3–4 unequal series; surfaces sparsely strigose, eglandular. |
in 2–3 series, with prominent central veins; surfaces glabrous, densely glandular. |
Fruits | 1–2 mm, nearly glabrous to sparsely strigose; inner pappi of numerous barbellate bristles. |
2.5–3 mm, sparsely to moderately strigose; inner pappi of numerous barbellate bristles. |
Heads | 1, radiate. |
1, radiate. |
2n | =27. |
|
Erigeron elegantulus |
Erigeron howellii |
|
Distribution | ||
Discussion | Rocky areas, sagebrush, coniferous forests. Flowering Jun–Aug. 700–2500 m. BR, BW, Casc, Owy. CA. Native. |
Rocky slopes, open woods. Flowering May–Jul. 100–1500 m. Casc. WA. Native. |
Source | Flora of Oregon, volume 2, page 256 James Riser, Stephen Meyers |
Flora of Oregon, volume 2, page 258 James Riser, Stephen Meyers |
Sibling taxa | ||
Web links |