Cirsium andersonii |
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Anderson's thistle |
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Habit | Plants perennial, (1.5)4–7(10) dm; taprooted, sometimes with creeping roots. |
Stems | usually 1, sparsely arachnoid-tomentose to glabrate. |
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. |
Involucres | broadly cylindric to narrowly campanulate, 3–5 × 2–4 cm, glabrous to thinly tomentose. |
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. |
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. |
Fruits | 6–7 mm, brown; pappi 25–40 mm. |
Heads | 1–6 per branch; lateral heads widely spaced along distal portions of branches. |
Cirsium andersonii |
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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. |
Source | Flora of Oregon, volume 2, page 225 Bridget Chipman |
Sibling taxa | |
Web links |