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Montana Field Guide

Montana Field Guides

Tilesius Wormwood - Artemisia tilesii

Status Under Review

Global Rank: G5
State Rank: SU

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 4

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General Description
Rhizomatous perennial. Stems simple, erect, 30–80 cm. Herbage tomentose; leaves glabrate above. Leaves cauline, petiolate; blades 3–7 cm long, lanceolate, entire to lobed; ultimate segments acute. Inflorescence narrow, leafy paniculate; heads erect to spreading. Involucre hemispheric, 3–5 mm high, wider than high; phyllaries brown, sparsely tomentose; receptacle glabrous. Disk flowers 30 to 70, perfect and female, glabrous; corolla 2–3 mm long; yellow. Achenes glabrous, 1–2 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Diagnostic Characteristics
Three MONTU collections from Montana may be this taxon: Teton Co., Powell Co. and Mission Mts. Each of these has a different combination of leaf outline, leaf size, leaf division, phyllary dimention and phyllary pubescence characters. All three are from montane to subalpine habitat, as is normal for typical A. tilesii. Their morphological variation may reflect past hybridization with other taxa in the A. ludoviciana complex. More study is needed.

Range Comments
AK to QC south to OR, ID and MT (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Habitat

References
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Citation for data on this website:
Tilesius Wormwood — Artemisia tilesii.  Montana Field Guide.  .  Retrieved on , from