Erigeron nanus

Nuttall

Trans. Amer. Philos. Soc., n. s. 7: 308. 1840.

Common names: Dwarf fleabane
Treatment appears in FNA Volume 20. Treatment on page 285. Mentioned on page 271.
Revision as of 20:29, 16 December 2019 by FNA>Volume Importer

Perennials, 2–10 cm; taprooted, caudices with relatively short and thick branches. Stems erect, hispido-hirsutulous to hirsute (hairs spreading, stiff, usually of unequal lengths, relatively thick-based), minutely glandular. Leaves mostly basal (persistent) (petioles prominently ciliate, hairs thick-based, spreading); blades linear-oblanceolate, 20–40 × 1–2(–3) mm, margins entire, often coarsely spreading-ciliate, faces hispido-hirsute to hirsute or glabrous, abaxial sometimes glabrous, sometimes sparsely minutely glandular; cauline abruptly reduced, restricted to proximal 1/3 of stems. Heads 1. Involucres 5–8 × 7–13 mm. Phyllaries in 2–3(–4) series, densely villous proximally, hirsute to hirsuto-villous, minutely glandular. Ray florets 15–35; corollas usually blue to purplish, rarely white, 5–10 mm, laminae coiling. Disc corollas 3.9–5.5 mm. Cypselae 2.2–2.8 mm, 2-nerved, faces sparsely strigose to glabrate; pappi: outer of setae, bristles, or scales, inner of 15–23 bristles.


Phenology: Flowering May–Jun.
Habitat: Dry sites, ridges, rocky slopes, clay slopes, quartzite outcrops, sagebrush, pine-fir
Elevation: 1900–2700(–3200) m

Discussion

Erigeron nanus is unusually variable in leaf vestiture. The tendency (especially in Cassia County, Idaho) for sparsely strigose adaxial and glabrous abaxial leaf faces is similar to that of the E. radicatus group; longer disc corollas and the strong tendency for unequal-length stem hairs, plus spreading-ciliate petioles, place E. nanus closer to E. disparipilus and E. poliospermus.

Selected References

None.

Lower Taxa

None.
... more about "Erigeron nanus"
Guy L. Nesom +
Nuttall +
Dwarf fleabane +
Idaho +, Nev. +, Utah +  and Wyo. +
1900–2700(–3200) m +
Dry sites, ridges, rocky slopes, clay slopes, quartzite outcrops, sagebrush, pine-fir +
Flowering May–Jun. +
Trans. Amer. Philos. Soc., n. s. +
Achaetogeron +  and Trimorpha +
Erigeron nanus +
Erigeron +
species +