Erigeron allocotus

S. F. Blake

J. Wash. Acad. Sci. 27: 379. 1937.

Common names: Bighorn fleabane
Endemic
Treatment appears in FNA Volume 20. Treatment on page 299. Mentioned on page 264.

Perennials, 10–18 cm; taprooted, caudices multicipital or branched. Stems erect to ascending (branched, brittle), hispido-hirsute (hairs brittle), minutely glandular. Leaves basal (often not persistent) and cauline; blades spatulate 15–30 × 1.5–4 mm, cauline gradually reduced distally (reduced to bracts on peduncles), margins usually 3-lobed (lobes linear to oblong-oblanceolate, about as wide as central portion of blades), sometimes 2-ternate or (cauline) entire, faces sparsely hispido-hirsute, minutely glandular. Heads usually 2–4. Involucres 4–5 × 6–9 mm. Phyllaries in 2–3 series, glabrous or sometimes sparsely hispid, densely minutely glandular. Ray florets 20–40; corollas white to bluish, sometimes drying pink, 3–6 mm, laminae not coiling or reflexing. Disc corollas 2.5–3.5 mm. Cypselae 2–2.3 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 12–20 bristles.


Phenology: Flowering May–Aug.
Habitat: Dry, calcareous sites on cliff faces, ledges, talus slopes, ridgetops, rock outcrops, barren redbeds, sometimes with Utah juniper, mountain mahogany, or sagebrush
Elevation: 1300–2300 m

Discussion

The brittle, hispid vestiture, and multiple small heads (more than one per stem) with short rays of Erigeron allocotus are unusual among its putative relatives with 3-parted leaves.

Selected References

None.

Lower Taxa

None.
... more about "Erigeron allocotus"
Guy L. Nesom +
S. F. Blake +
Bighorn fleabane +
Mont. +  and Wyo. +
1300–2300 m +
Dry, calcareous sites on cliff faces, ledges, talus slopes, ridgetops, rock outcrops, barren redbeds, sometimes with Utah juniper, mountain mahogany, or sagebrush +
Flowering May–Aug. +
J. Wash. Acad. Sci. +
Achaetogeron +  and Trimorpha +
Erigeron allocotus +
Erigeron +
species +