Tetradymia nuttallii |
Tetradymia spinosa |
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catclaw horsebrush, cotton-thorn horsebrush |
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Habit | Plants 1–12 dm; rhizomatous. | |
Stems | spiny, densely tomentose. |
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Involucres | hemispheric, 6–12 mm. |
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Florets | 5–8; corollas 6–10 mm, yellow. |
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Phyllaries | 4–6; surfaces glabrous to tomentose. |
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Fruits | 6–8 mm, densely pubescent, pappi of 20–30 scales, 6–9 mm. |
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Heads | 1–2. |
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Primary leaves | becoming recurved spines, 5–30 mm. |
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Secondary leaves | linear to oblanceolate, 3–25 mm; surfaces glabrous to glabrate. |
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2n | =60. |
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Tetradymia nuttallii |
Tetradymia spinosa |
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Distribution | ||
Discussion | Sagebrush, scrub, juniper forests. Flowering May–Jul. 400–1800 m. BR, ECas, Owy. CA, ID, NV; northeast to MT, east to WY, southeast to NM. Native. |
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Source | Flora of Oregon, volume 2, page 362 Stephen Meyers |
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Sibling taxa | ||
Synonyms | Tetradymia spinosa var. longispina, Tetradymia spinosa var. spinosa | |
Web links |