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Erigeron humilis
R. C. Graham
No occurrences found
Family:
Asteraceae
arctic alpine fleabane
[
Erigeron unalaschkensis
(DC.) Vierh.,
more
Erigeron uniflorus var. unalaschkensis
(DC.) B. Boivin
]
Images
not available
FNA
Resources
Guy L. Nesom in Flora of North America (vol. 20)
Perennials
2-15(-25) cm; rhizomatous, fibrous-rooted, rhizomes or caudices simple or branched.
Stems
erect, villoso-hirsute (hair cross walls dark to blackish purple), minutely glandular (conspicuously so proximal to heads).
Leaves
mostly basal (persistent) and cauline; blades spatulate to spatulate-oblanceolate, 10-50(-80) × 2-7(-11) mm, cauline abruptly reduced distally, margins entire, faces sparsely to moderately villous (hair cross walls dark reddish or purple), sometimes sparsely minutely glandular.
Heads
1.
Involucres
6-9 × 10-15(-20) mm.
Phyllaries
in (1-)2(-3) series (usually dark purple), strigoso-hirsute (hair cross walls dark reddish to blackish purple), minutely glandular.
Ray florets
50-100(-150); corollas bluish purple to lavender, rarely whitish, 4-6 mm, laminae erect (filiform, 0.3-1 mm wide), not coiling or reflexing.
Disc corollas
2.4-3 mm.
Cypselae
2.2-2.5 mm, plump, 2-nerved, faces finely strigoso-hirsute;
pappi:
outer of setae (inconspicuous), inner of 20-30 bristles.
2
n
= 36. Flowering Jun-Aug(-Sep). Arctic and alpine tundra, snowbed slopes, pond and stream margins, boulder ridges in streambeds, heaths, ledges, dry gravelly slopes; (Greenland, 0-)1000-2400(-4000, Colorado, Utah) m; Greenland; Alta., B.C., Man., Nfld. and Labr. (Labr.), N.W.T., Nunavut, Ont., Que., Yukon; Alaska, Colo., Idaho, Mont., Utah, Wyo.; n Eurasia.
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