Flora of North America species comparison

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Tetradymia spinosa

catclaw horsebrush, cotton-thorn horsebrush, shortspine horsebrush, spiny horsebrush
Habit Shrubs, 10–100 cm.
Stems

1–5+, erect or spreading, spiny, evenly pannose.
Leaves

primaries forming recurved spines, 5–25 mm;

secondaries linear-filiform to spatulate, 3–25 (× 1–2) mm, glabrous or glabrescent.
Peduncles

5–30 mm.
Involucres

hemispheric, 8–12 mm.
Florets

5–8;

corollas pale to bright yellow, 6–10 mm.
Phyllaries

4–6, oblong to ovate.
Heads

1–2 (in axils of spines).
Cypselae

6–8 mm, copiously pilose (hairs 9–12 mm);

pappi of ca. 25, subulate scales 6–9 mm.
2n

= 60.

Tetradymia spinosa
Phenology Flowering spring.
Habitat Usually sandy soils of alkali sinks, shadscale scrub, pinyon-juniper woodlands
Elevation 800–2400 m (2600–7900 ft)
Distribution
from FNA
CA; CO; ID; MT; NM; NV; OR; UT; WY
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 20, p. 632.
Parent taxa Asteraceae > tribe Senecioneae > Tetradymia
Sibling taxa
T. argyraea, T. axillaris, T. canescens, T. comosa, T. filifolia, T. glabrata, T. nuttallii, T. stenolepis, T. tetrameres
Name authority Hooker & Arnott: Bot. Beechey Voy., 360. (1839)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Fabaceae, Apiaceae, Boraginaceae, and Polemoniaceae.)

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