OregonFlora species comparison

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Tetradymia spinosa

catclaw horsebrush, cotton-thorn horsebrush
Habit Plants 1–12 dm; rhizomatous.
Stems

spiny, densely tomentose.
Involucres

hemispheric, 6–12 mm.
Florets

5–8;

corollas 6–10 mm, yellow.
Phyllaries

4–6;

surfaces glabrous to tomentose.
Fruits

6–8 mm, densely pubescent, pappi of 20–30 scales, 6–9 mm.
Heads

1–2.
Primary leaves

becoming recurved spines, 5–30 mm.
Secondary leaves

linear to oblanceolate, 3–25 mm;

surfaces glabrous to glabrate.
2n

=60.

Tetradymia spinosa
Distribution
[WildflowerSearch map]
[BONAP county map]
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.
Source Flora of Oregon, volume 2, page 362
Stephen Meyers
Sibling taxa
T. canescens, T. glabrata
Synonyms Tetradymia spinosa var. longispina, Tetradymia spinosa var. spinosa
Web links 
Unless otherwise noted, all data comes from OregonFlora.



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