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

Artemisia tilesii Ledeb.
Aleutian mugwort (Tilesius' wormwood)
Asteraceae (Aster family)

Introduction to Vascular Plants

© Virginia Skilton  Email the photographer   (Photo ID #89099)

E-Flora BC Static Map
Distribution of Artemisia tilesii
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Species Information

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Perennial herb from a rhizome; stems erect, several, 0.3-1.5 m tall.
Basal leaves soon deciduous; stem leaves linear-lanceolate to oblanceolate, egg-shaped or almost round in outline, few-toothed or lobed to deeply pinnate or subpalmately divided, some of the segments again toothed or divided, white-woolly below, green or rarely finely white-woolly above, 5-15 cm long.
Heads disciform, erect or nodding in a compact or narrow, branched inflorescence; involucres bell-shaped or top-shaped, 3-5 mm tall; involucral bracts broadly lanceolate to egg-shaped, purplish or sometimes green; receptacles glabrous; female flowers 8-12; disk flowers 20-40.
Achenes glabrous.
Only two varieties of this species are readily separated taxonomically, and to a lesser extent geographically, in our region (Douglas 1995). They may be separated as follows:

1. Inflorescence relatively short and compact, usually overtopped by the upper leaves .....................var. tilesii

1. Inflorescence ample and open to subcompact in a narrow, branched inflorescence, always surpassing the upper leaves....................... var. unalaschcensis (Bess.) Hult.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Blooming Period:
Fruit/Seed characteristics:
Colour: Brown
Present over the
According to the USDA, this species is a known allelopath.
Source:  The USDA

Habitat / Range

Moist to mesic meadows, streambanks, gravel bars, rocky slopes and open forests in the lowland and montane to alpine zones; common in N BC, infrequent southward; circumboreal, N to AK, YT and NT; E to ON and S to MT, ID and OR, Eurasia.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Artemisia tilesii

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




Elevation (metres) 60 948 1845
Slope Gradient (%) 0 13 70
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
20 127 315
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 4 7
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: BAFA(1), BG(1), BWBS(17), CWH(1), ESSF(1), ICH(1), PP(1), SWB(14)


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

Artemisia elatior (Torr. & A. Gray) Rydb.
Artemisia tilesii subsp. tilesii Ledeb.
Artemisia tilesii subsp. unalaschensis
Artemisia tilesii var. elatior Torr. & A. Gray
Artemisia tilesii var. tilesii Ledeb.
Artemisia tilesii var. unalaschcensis (Bess.) Hult.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References