Search Field Guide
Advanced Search
Montana Field Guide

Montana Field Guides

Spearleaf Rabbitbrush - Lorandersonia linifolia
Other Names:  Chrysothamnus viscidiflorus var. linifolius, Chrysothamnus linifolius

Potential Species of Concern

Global Rank: G5
State Rank: S3S4

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

External Links






 
General Description
Spreading rabbitbrush is a shrub, up to 2 m (7 ft) high, with erect or ascending branches. The alternate leaves, 1-5 cm long, are narrowly elliptic and straight with entire margins. The bark is whitish and mostly glabrous, and the foliage is glabrous. Numerous flower heads are borne in flat-topped inflorescences on the branch tips. Each head has ca. 4 series of narrow, overlapping involucral bracts, 4-7 mm long, with rounded tips and numerous yellow disk corollas, 4-7 mm long. Ray flowers are lacking. The hairy seeds (achenes) have numerous thin bristles on top (pappus).

Phenology
Flowering in September.

Diagnostic Characteristics
The glabrous to sparsely hairy twigs combined with straight rather than twisted leaves separate this species from other Chrysothamnus in our area. A hand lens may be needed to determine these characters.

Habitat
Moist alkaline or saline soil along rivers and streams in the valleys and on the plains.

References
Login Logout
Citation for data on this website:
Spearleaf Rabbitbrush — Lorandersonia linifolia.  Montana Field Guide.  .  Retrieved on , from