Artemisia tilesii

Ledebour

Mém. Acad. Imp. Sci. St. Pétersbourg Hist. Acad. 5: 568. 1814

Synonyms: Artemisia hookeriana Besser Artemisia hultenii M. M. Maximova Artemisia tilesii var. aleutica (Hultén) S. L. Welsh Artemisia tilesii var. elatior Torrey & A. Gray Artemisia tilesii subsp. gormanii (Rydberg) Hultén Artemisia tilesii subsp. hultenii (M. M. Maximova) V. G. Sergienko Artemisia tilesii var. unalaschcensis Besser Artemisia unalaskensis var. aleutica Hultén Artemisia vulgaris subsp. tilesii (Ledebour) H. M. Hall & Clements
Treatment appears in FNA Volume 19. Treatment on page 533. Mentioned on page 522.
Perennials, 20–60(–80) cm, mildly aromatic (rhizomes coarse). Stems 1–3, erect, white, tomentose (on distal branches, hairs appressed) or glabrate. Leaves basal and cauline, bicolor (white and green); blades (basal) linear to broadly lanceolate, 3–7(–10) × 2–5(–6) cm, coarsely pinnately lobed (cauline becoming linear distally), faces tomentose (abaxial) or glabrous (adaxial). Heads in compact to broadly branched, paniculiform arrays 1–20 × 2–6 cm. Involucres broadly campanulate, 4–5 × 3.5–4 mm. Phyllaries (violet-brown) oval (outer) to elliptic or lanceolate, sparsely tomentose. Florets: pistillate 9; bisexual 25–60; corollas yellow, 1.5–3 mm, glabrous (style branches included, erect, linear, relatively short, short-ciliate). Cypselae oblong-linear (angular), 1.2–1.5 mm, glabrous. 2n = 18, 36.

Phenology: Flowering mid summer–early fall.
Habitat: Arctic and alpine tundra, sandy, rocky slopes near shorelines
Elevation: 0–2000 m

Distribution

V19-927-distribution-map.gif

Alta., B.C., Man., N.W.T., Nunavut, Ont., Que., Sask., Yukon, Alaska, Idaho, Mont., Oreg., Wash., Asia (Russia).

Discussion

Artemisia tilesii has a bewildering array of variation in leaf and inflorescence morphology that has been separated into four infraspecific taxa recognized in some floras. I am unable to separate these taxa consistently and am including them within a broad circumscription of the species.

References

None.

Lower Taxa

No lower taxa listed.