E-Flora BC: Electronic Atlas of the Flora of British Columbia

Erigeron humilis Graham
arctic-alpine daisy (arctic alpine fleabane)
Asteraceae (Aster family)

Introduction to Vascular Plants

© Ryan Durand  Email the photographer   (Photo ID #14325)

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Distribution of Erigeron humilis
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Species Information

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General:
Perennial herb from a short taproot or a short, brittle, woody stem-base and often some fibrous roots; stems generally lax, erect or ascending, more or less spreading long-hairy, the hairs, especially the upper ones, usually with some purple cross-walls, 1-25 cm tall.
Leaves:
Basal leaves oblanceolate or occasionally spoon-shaped, 1-9 cm long, 1.5-11 mm wide; stem leaves reduced upwards, linear or linear-lanceolate, the lowermost abruptly sharp-pointed, the uppermost tapering to a slender tip.
Flowers:
Heads with ray and disk flowers, solitary, the disks 10-20 mm wide; involucres 6-9 mm wide; involucral bracts subequal, more or less densely long woolly-hairy, the hairs with dark purple or blackish cross-walls (rarely without or with only a few purplish crosswalls) narrow, loose, tapering to a slender tip, generally heavily tinted blackish-purple, rarely more greenish; ray flowers 50-150, white to purplish, 3.5-6 mm long, 0.5-1 mm wide; disk flowers 2.4-4.8 mm long.
Fruits:
Achenes 2-nerved, more or less hairy; pappus double, the inner of about 20-30 bristles, these exceeding the disk flowers, the outer of a few short and inconspicuous scales.
Notes:
Some specimens (in or near populations of normal plants) from northern BC and YT have whitish involucral hairs that lack or have only a few purplish crosswalls (Douglas 1995). These plants are extremely difficult to separate from Erigeron uniflorus ssp. eriocephalus with which they may be hybridizing.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Wet to moist seepage areas and meadows in the montane to alpine zones; common throughout N BC, rare in S BC; N to AK, YT and NT, E to PQ and S to MT and N WA.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Erigeron humilis

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class

Minimum

Average

Maximum

Elevation (metres) 475 1775 2550
Slope Gradient (%) 0 23 85
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
2 162 355
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 3 8
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
148
Modal BEC Zone Class
BAFA
All BEC Zones (# of stations/zone) species was recorded in: AT(10), BAFA(59), BWBS(1), cma(1), ESSF(41), IMA(5), MH(2), SBS(5), SWB(11)

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Erigeron uniflorus var. unalaschkensis (DC.) Ostenf.
Erigeron unalaschkensis (DC.) Vierh.

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References