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Montana Field Guide

Montana Field Guides

Five-horn Smotherweed - Bassia hyssopifolia

Exotic Species (not native to Montana)

Global Rank: GNR
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 1

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General Description
Annual herbs with long-hairy foliage. Stems erect, branched, to 80 cm. Leaves sessile, linear-lanceolate, to 2 cm long with entire margins. Inflorescence terminal and lateral, bracteate spikes or flowers clustered in leaf axils. Flowers mostly perfect; calyx ca. 2 mm across, the 5 segments united below, each with a hooked spine up to 2 mm long; stamens 5. Fruit flattened, enclosed by calyx; seed horizontal (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Diagnostic Characteristics
Bassia hyssopifolia is sometimes confused with Russian thistles in our area (Salsola collina and S. tragus). Species of Russian thistle are more profusely branched and spiny than Bassia (Fischer et al. 1979).

Species Range
Unknown/Undetermined
 


Range Comments
In MT occuring in only about seven counties across much of state; native to Eurasia, naturalized across most of western temperate N. Amer. (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX; Welsh 2003 in Fl. N. Amer. Vol. 4).

Summary of Observations Submitted for Montana
Number of Observations: 2

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

Recency

 

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



Habitat
Saline wetlands, roadsides, disturbed fields; plains, valleys (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Five-horn Smotherweed — Bassia hyssopifolia.  Montana Field Guide.  .  Retrieved on , from