Erigeron davisii

(Cronquist) G. L. Nesom

Sida 21: 22. 2004.

Common names: Davis’s fleabane
EndemicConservation concern
Basionym: Erigeron engelmannii subsp. davisii Cronquist Leafl. W. Bot. 3: 167. 1942 (as engelmanni)
Synonyms: Erigeron engelmannii var. davisii (Cronquist) Cronquist
Treatment appears in FNA Volume 20. Treatment on page 287. Mentioned on page 259, 270, 271.

Perennials, 10–30 cm; taprooted, caudices simple or with relatively short, thick branches. Stems erect, hirsuto-villous to loosely strigose (hairs relatively translucent and vitreous, unequal in lengths, 0.1–1 mm), sometimes sparsely minutely glandular. Leaves mostly basal (persistent; petioles prominently ciliate, hairs spreading, thick-based), eglandular; blades linear to narrowly oblanceolate, 20–100 × 1–3.5 mm, abruptly reduced distally, margins entire, faces strigose to strigoso-hirsute, eglandular. Heads 1. Involucres 5–8 × 10–15 mm. Phyllaries in 2–3 series, loosely hirsute to hirsuto-villous, sometimes sparsely minutely glandular. Ray florets 50–80; corollas usually white, 8–14 mm, laminae (1.2–1.8 mm wide) coiling. Disc corollas 3.1–4 mm (glabrate, throats not indurate or inflated). Cypselae (obovoid) 2.1–2.5 mm, 2-nerved, faces sparsely to moderately strigoso-villous; pappi: outer of setae, inner of 14–20 bristles.


Phenology: Flowering (Apr–)May–Jul.
Habitat: Bare, rocky ridges and slopes, basalt outcrops, sparsely vegetated woodland openings or edges, commonly with grasses
Elevation: 1200–1800 m

Discussion

Of conservation concern.

Selected References

None.

Lower Taxa

None.
... more about "Erigeron davisii"
Guy L. Nesom +
(Cronquist) G. L. Nesom +
Erigeron engelmannii subsp. davisii +
Davis’s fleabane +
Idaho +  and Oreg. +
1200–1800 m +
Bare, rocky ridges and slopes, basalt outcrops, sparsely vegetated woodland openings or edges, commonly with grasses +
Flowering (Apr–)May–Jul. +
Endemic +  and Conservation concern +
Erigeron engelmannii var. davisii +
Erigeron davisii +
Erigeron +
species +