Cirsium scariosum |
Cirsium scariosum(synonym of Cirsium scariosum var. robustum) |
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dinnerplate thistle, elk thistle, meadow thistle |
dinnerplate thistle, elk thistle, meadow thistle |
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Habit | Plants biennial or monocarpic perennial, 0.5–20 dm; taprooted. | Plants biennial or monocarpic perennial, 0.5–20 dm; taprooted. |
Stems | often acaulescent or short-caulescent, sometimes caulescent with a single bushy-branched stem; stout and fleshy, glabrous or sparsely arachnoid-tomentose. |
often acaulescent or short-caulescent, sometimes caulescent with a single bushy-branched stem; stout and fleshy, glabrous or sparsely arachnoid-tomentose. |
Leaves | linear to elliptic, 10–40 × 3–8 cm; margins entire to deeply pinnately divided; plane or undulate; spines usually thin to moderately thick, 2–15 mm; surfaces abaxially glabrous to densely arachnoid-tomentose, adaxially glabrous to thinly tomentose or villous; basal usually present at flowering, sessile or petiolate. |
linear to elliptic, 10–40 × 3–8 cm; margins entire to deeply pinnately divided; plane or undulate; spines usually thin to moderately thick, 2–15 mm; surfaces abaxially glabrous to densely arachnoid-tomentose, adaxially glabrous to thinly tomentose or villous; basal usually present at flowering, sessile or petiolate. |
Involucres | ovoid to hemispheric, 1–3(4) × 1.5–6 cm, glabrous to thinly arachnoid-villous. |
ovoid to hemispheric, 1–3(4) × 1.5–6 cm, glabrous to thinly arachnoid-villous. |
Florets | corollas 20–40 mm, white to purple, sometimes rose or pink-tinged; tubes 9–22 mm; throats 4–12 mm; lobes 4–10 mm; styles conspicuously exserted; tips 3–8 mm. |
corollas 20–40 mm, white to purple, sometimes rose or pink-tinged; tubes 9–22 mm; throats 4–12 mm; lobes 4–10 mm; styles conspicuously exserted; tips 3–8 mm. |
Phyllaries | imbricate; without glutinous ridges; spines thin, 0–12 mm. |
imbricate; without glutinous ridges; spines thin, 0–12 mm. |
Fruits | 4–6.5 mm; light to dark brown, occasionally striate; pappi 15–35 mm. |
4–6.5 mm; light to dark brown, occasionally striate; pappi 15–35 mm. |
Heads | 1–many. |
1–many. |
Cirsium scariosum |
Cirsium scariosum |
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Distribution | ||
Discussion | Wet meadows, forest openings, sagebrush areas, pastures. Flowering Jun–Aug. 100–2000 m. BR, BW, Casc, ECas, Owy, Sisk, WV. CA, ID, NV, WA; north to British Columbia, northeast to Alberta, east to WY, southeast to NM, Quebec. Native. Cirsium scariosum is known to hybridize with other native species where their ranges overlap. |
Wet meadows, forest openings, sagebrush areas, pastures. Flowering Jun–Aug. 100–2000 m. BR, BW, Casc, ECas, Owy, Sisk, WV. CA, ID, NV, WA; north to British Columbia, northeast to Alberta, east to WY, southeast to NM, Quebec. Native. Cirsium scariosum is known to hybridize with other native species where their ranges overlap. |
Source | Flora of Oregon, volume 2, page 229 Bridget Chipman |
Flora of Oregon, volume 2, page 229 Bridget Chipman |
Sibling taxa | ||
Synonyms | Cirsium foliosum, Cirsium scariosum var. americanum, Cirsium scariosum var. robustum, Cirsium scariosum var. scariosum, Cirsium scariosum var. toiyabense | Cirsium foliosum, Cirsium scariosum var. americanum, Cirsium scariosum var. robustum, Cirsium scariosum var. scariosum, Cirsium scariosum var. toiyabense |
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