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Montana Field Guide

Montana Field Guides

Alkali Sagebrush - Artemisia arbuscula ssp. longiloba
Other Names:  Artemisia longiloba

Status Under Review

Global Rank: G5T4
State Rank: SU

Agency Status
MNPS Threat Rank:

External Links

General Description
Shrub 10–40 cm high; stems flexuous and often spreading. Herbage tomentose, sometimes with obscure resin dots beneath tomentum. Leaves cuneate, 5–25 mm long, 3-lobed distally, apex of lobes rounded. Inflorescence spiciform; bracts linear. Involucre campanulate, 3–5 mm high; phyllaries green, tomentose; receptacle glabrous. Disk flowers perfect, 4 to 8, glabrous or glandular; corolla ca. 2 mm long. Achenes resinous, <1 mm long (adapted from Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX; and Shultz, 2006, Fl. North America, Vol. 19).

Diagnostic Characteristics
Shultz (2006) separates this subspecies from the typical subspecies by its more broadly cuneate leaves, the apices of which are rounde. The middle lobes typically overlap the lateral lobes. Involucres are 2–3 mm long, 1.5–2.5 mm wide.

Species Range

Range Comments
In Montana this subspecies currently is known only from Beaverhead and Madison counties. Elsewhere it occurs from OR and ID to northeastern CA, NV, UT, WY and CO (Kartesz 2009).

Summary of Observations Submitted for Montana
Number of Observations: 1

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Clay soils of alkaline basins and valleys, occasionally on outwash plains of mountains; 1500–2500 m (Shultz, 2006, Fl. North America, Vol. 19).

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Citation for data on this website:
Alkali Sagebrush — Artemisia arbuscula ssp. longiloba.  Montana Field Guide.  .  Retrieved on , from