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FNA | Family List | FNA Vol. 19, 20 and 21 | Asteraceae | Artemisia

37d. Artemisia ludoviciana Nuttall subsp. incompta (Nuttall) D. D. Keck, Publ. Carnegie Inst. Wash. 520: 327. 1940.

Mountain wormwood

Artemisia incompta Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 400. 1841; A. arachnoidea E. Sheldon; A. atomifera Piper; A. lindleyana Besser. A. ludoviciana var. incompta (Nuttall) Cronquist; A. prescottiana Besser; A. vulgaris Linnaeus var. incompta (Nuttall) H. St. John

Stems 20–50(–80) cm, mostly simple, hairy. Leaves bicolor (white and green, or gray-green and green); blades narrowly to broadly lanceolate, 1.5–11 × 1–1.5 cm, irregularly lobed (lobes usually 1/3+ blade widths), faces hairy (abaxial) or glabrous or glabrescent. Heads in paniculiform arrays (10–)15–25(–35) × (2–)3–8(–10) cm. Involucres (broadly campanulate) 3(–4) × 3–5) mm. Florets: pistillate 5–12; bisexual 6–45; corollas yellow, sometimes red-tinged, 1.5–2 mm. 2n = 36, 54.

Flowering mid summer–late fall. Open meadows, mountain slopes; 1900–3500 m; Alta., B.C.; Calif., Colo., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo.; Mexico.

Subspecies incompta varies. It could be (and has been) subdivided. The variation found within one population, as well as from one part of its range to another, makes the recognition of discrete taxa difficult as well as questionable. The morphologic variant treated as Artemisia lindleyana by some authors may warrant infraspecific status.


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