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Montana Field Guide

Montana Field Guides

Rush Skeletonweed - Chondrilla juncea
Other Names:  Hog Bite

Noxious Weed: Priority 1B
Non-native Species

Global Rank: GNR
State Rank: SNA

Agency Status
MNPS Threat Rank:
C-value: 0

External Links

General Description
Taprooted perennial with milky sap. Stems ascending to erect, branched, 25–100 cm. Herbage hirsute to glabrate. Leaves basal and cauline; basal petiolate, oblong, pinnately lobed, sharply dentate, 5–13 cm long, deciduous; cauline alternate, linear-oblong, 2–10 cm long. Heads ligulate, short-peduncled in axils of upper reduced leaves. Involucres 8–12 mm high, sparsely tomentose, subtended by small bracts; phyllaries 5 to 9, linear-lanceolate in 1 series. Ray flowers perfect, yellow, 7 to 15; ligules 4–6 mm long. Pappus capillary bristles. Achenes cylindric, glabrous, ribbed, 3–4 mm long with a 5–6 mm beak (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Collected in Sanders and Treasure counties. Introduced to northwest and northeast U.S. and adjacent Canada; native to Eurasia (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 726

(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)



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Citation for data on this website:
Rush Skeletonweed — Chondrilla juncea.  Montana Field Guide.  .  Retrieved on , from