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The Mission of the Yellowstone County Weed Department is to assist the public, private, and other government agencies to manage and control existing noxious weed infestations as well as to prevent new invasive species from infesting Yellowstone County.
Rush SkeletonweedChondrilla juncea
Sunflower family - Asteraceae
Photo from Montana Weed Control Association
Photos from Montana Weed Control Association
Video Supplied By Montana Weed Control Association
| Attribute | Description |
|---|---|
| Growth Habit | Herbaceous perennial. |
| Leaves | Lance-shaped, deeply lobed, 2–5 inches long. |
| Stem | One or more, 20–60 inches long with multiple spreading or ascending light green branches, smooth except for the lowermost 2–3 inches, which are densely covered with stiff, downward-directed hairs. |
| Flower | Terminate flower-heads individually or in groups of 2–3. Each flower head contains 10–12 bright yellow florets. Flowers are self-fertile. |
| Roots | Taproot. |
| Seeds | About 3mm long, pale to dark brown and vertically ribbed with scales & tooth-like projections at the tufted end. |
| Reproduction | Seeds, root cuttings, rosettes from the root crown. |
| Habitat | Open, waste areas with disturbed soils, along roadsides and in unimproved pastures. |
| Biological Controls | Skeletonweed gall midge (Cystiphora schmidti), Skeletonweed gall mite (Eriophyes chondrillae), Rush skeletonweed rust (Puccinia chondrillina). |
| Herbicides | None used in Yellowstone County at this time. |