Cirsium andersonii |
Cirsium brevifolium |
|
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Anderson's thistle |
Palouse thistle |
|
Habit | Plants perennial, (1.5)4–7(10) dm; taprooted, sometimes with creeping roots. | Plants perennial, 2.5–12 dm; taprooted with lateral roots. |
Stems | usually 1, sparsely arachnoid-tomentose to glabrate. |
1–several, gray-tomentose. |
Leaves | elliptic to linear-oblong, 8–20(35) × 2–8 cm, gradually reduced above; margins coarsely dentate or 1–2-pinnate; spines 1–5 mm; surfaces abaxially ± thinly gray-tomentose, adaxially glabrous to sparsely pilose; basal usually present at flowering, clasping to petiolate. |
elliptic to oblanceolate, 12–45 × 2–10 cm; margins entire to deeply dentate or pinnately lobed; spines 2–6 mm; surfaces abaxially densely white-tomentose, adaxially thinly tomentose to glabrate; basal usually present at flowering, sessile, clasping, or petiolate. |
Involucres | broadly cylindric to narrowly campanulate, 3–5 × 2–4 cm, glabrous to thinly tomentose. |
hemispheric to campanulate; (1.5)2–3.5 × 2–4 cm. |
Florets | corollas 30–45 mm, red, occasionally red-purple; tubes 10–20 mm; throats abruptly narrowed to tubes, 10–16 mm; lobes 9–11 mm; styles conspicuously exserted; tips 3.5–5 mm, sometimes geniculate. |
corollas 20–28 mm, white to cream-colored, occasionally lavender-tinged; tubes 8–13 mm; throats 7–11 mm; lobes 4–6 mm; style tips 5–6 mm. |
Phyllaries | without glutinous ridges; spines weak, 1–3 mm; outer short, linear-lanceolate, appressed; margins entire or spiny-ciliate; tips long-acuminate; inner linear; long; entire; tips red to purple; flat. |
strongly imbricate, with prominent glutinous ridges; tips reflexed; spines fine, 2–5 mm. |
Fruits | 6–7 mm, brown; pappi 25–40 mm. |
5–6 mm; straw-colored to light brown; pappi 28–34 mm. |
Heads | 1–6 per branch; lateral heads widely spaced along distal portions of branches. |
1–few. |
Cirsium andersonii |
Cirsium brevifolium |
|
Distribution | ||
Discussion | Open grasslands, montane woodlands. Flowering Jul–Sep. 1500–2500 m. ECas. CA, NV. Native. Cirsium andersonii, while currently rare in Oregon, is well documented in northern California and Nevada. |
Meadows, forest edges, sagebrush areas, roadsides. Flowering Jun–Aug. 200–1500 m. BW, Lava, Owy. ID, WA. Native. |
Source | Flora of Oregon, volume 2, page 225 Bridget Chipman |
Flora of Oregon, volume 2, page 225 Bridget Chipman |
Sibling taxa | ||
Web links |