Flora of North America species comparison

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Tetradymia argyraea

striped cottonthorn, striped horsebrush
Habit Shrubs, 50–200 cm.
Stems

1–5+, erect, spiny, unevenly pannose with glabrescent streaks.
Leaves

primaries forming ascending spines, 10–30 mm;

secondaries filiform to clavate, 3–20 (× 1+) mm, glabrous or nearly so.
Peduncles

1–4 mm.
Involucres

turbinate, ca. 7 mm.
Florets

5;

corollas pale yellow, ca. 9 mm.
Phyllaries

5, oval-elliptic.
Heads

2–5.
Cypselae

2.5–3.5 mm, glabrous;

pappi of 75–100 bristles ca. 8 mm.
2n

= 60.

Tetradymia argyraea
Phenology Flowering summer.
Habitat Rocky sites, pinyon-juniper woodlands
Elevation 1400–2100 m (4600–6900 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 20, p. 631.
Parent taxa Asteraceae > tribe Senecioneae > Tetradymia
Sibling taxa
T. axillaris, T. canescens, T. comosa, T. filifolia, T. glabrata, T. nuttallii, T. spinosa, T. stenolepis, T. tetrameres
Name authority Munz & J. C. Roos: Aliso 2: 237. (1950)
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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