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Montana Field Guide

Montana Field Guides

Pygmy Goldenweed - Tonestus pygmaeus
Other Names:  Haplopappus pygmaeus

Potential Species of Concern

Global Rank: G4
State Rank: SH
* (see State Rank Reason below)

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

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State Rank Reason (see State Rank above)
Known in Montana from 1 historical collection from Lolo Peak. Other historical locations previously reported for MT have all been based on mis-identified specimens of Tonestus lyallii
 
General Description
Pygmy Goldenweed is a mat-forming perennial with several stems that are 1-6 cm high and which arise from a taproot and branched rootcrown. The narrowly oblong, entire-margined basal leaves are 1-5 cm long and 1-5 mm wide. The alternate stem leaves are only somewhat smaller. Foliage is glabrous, except for sticky hairs toward the top. The bell-shaped flower heads are solitary on the stem tips and 8-10 mm high. Each head has ca. 2 series of slightly overlapping narrow involucral bracts. Tips of the outer heads are blunt, but those of the inner heads are pointed. The 10-35 yellow rays are 6-8 mm long, and the yellow disk flowers are 5-7 mm long. The elongate achenes are topped by numerous, white to tan bristles, forming a pappus.

Phenology
Flowering in August.

Diagnostic Characteristics
Tonesetus lyallii has sticky, glandular foliage. Other species formerly placed in Haplopappus with solitary flower heads have very reduced stem leaves. Erigeron linearis has yellow rays, but its leaves are linear.

Range Comments
Southeastern Wyoming to northern New Mexico, with a disjunct population in the Bitterroot Mountains of southwestern Montana.

Habitat
Alpine slopes and meadows.

Ecological Systems Associated with this Species

References
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Citation for data on this website:
Pygmy Goldenweed — Tonestus pygmaeus.  Montana Field Guide.  .  Retrieved on , from