OregonFlora: Chondrilla juncea

	Chondrilla juncea
	rush skeletonweed
Habit	Plants 5–15 dm; with stout, deeply penetrating taproots, spreading laterally by buds on rhizome-like side roots.
Basal leaves	5–15 cm.
Cauline leaves	upper 1–7 cm.
Involucres	9–12 mm.
Florets	6–15; ligules 10–12 mm.
Phyllaries	surfaces tomentose; outer deltoid; all basal; inner 5–10; equal, linear-lanceolate; tips acuminate.
Fruits	bodies 3–3.5 mm, gray or pale brown; beaks 5–6 mm.
2n	=15, 30.

	Chondrilla juncea
Distribution	[WildflowerSearch map] [BONAP county map]
Discussion	Roadsides, riverbanks, disturbed areas. Flowering Jul–Sep. 0–700 m. CR, Sisk, WV. CA, ID, WA; scattered in North America; Australia, Europe. Exotic. Although morphologically variable, Chondrilla juncea is reported to reproduce only by clonal root-sprouts and asexually produced seeds. The species is listed as a noxious weed in several western states, including Oregon. Several biological control organisms have been introduced, including a gall midge, gall mite, and rust fungus.
Source	Flora of Oregon, volume 2, page 221 Kenton Chambers
Web links	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Chondrilla juncea

rush skeletonweed

Habit

Plants 5–15 dm; with stout, deeply penetrating taproots, spreading laterally by buds on rhizome-like side roots.

Basal leaves

5–15 cm.

Cauline leaves

upper 1–7 cm.

Involucres

9–12 mm.

Florets

6–15;

ligules 10–12 mm.

Phyllaries

surfaces tomentose; outer deltoid; all basal; inner 5–10; equal, linear-lanceolate;

tips acuminate.

Fruits

bodies 3–3.5 mm, gray or pale brown;

beaks 5–6 mm.

=15, 30.

Chondrilla juncea

Distribution

[WildflowerSearch map]

[BONAP county map]

Discussion

Roadsides, riverbanks, disturbed areas. Flowering Jul–Sep. 0–700 m. CR, Sisk, WV. CA, ID, WA; scattered in North America; Australia, Europe. Exotic.

Although morphologically variable, Chondrilla juncea is reported to reproduce only by clonal root-sprouts and asexually produced seeds. The species is listed as a noxious weed in several western states, including Oregon. Several biological control organisms have been introduced, including a gall midge, gall mite, and rust fungus.

Source

Flora of Oregon, volume 2, page 221
Kenton Chambers

Web links