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Montana Field Guide

Montana Field Guides

Rush Skeletonweed - Chondrilla juncea

Noxious Weed: Priority 1B
Exotic Species (not native to Montana)

Global Rank: GNR
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 0

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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).

Summary of Observations Submitted for Montana
Number of Observations: 83

(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

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