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gray horsebrush, grey horsebrush, spineless horsebrush

Habit Shrubs, 10–80 cm.
Stems

1–5+, erect, unarmed, pannose but for floccose or glabrescent streaks.

Leaves

primaries lanceolate to spatulate, 5–40 (× 2–6) mm, tomentose to sericeous;

secondaries similar, smaller.

Peduncles

5–25 mm.

Involucres

turbinate to cylindric, 6–12 mm.

Florets

4;

corollas cream to bright yellow, 7–15 mm.

Phyllaries

4, oblong to lanceolate.

Heads

3–8.

Cypselae

3–5 mm, glabrous or hirsute;

pappi of 100–150 bristles 6–11 mm.

2n

= 60, 62, 90, 120.

Tetradymia canescens

Phenology Flowering spring–fall.
Habitat Sagebrush scrub, pinyon-juniper woodlands, yellow-pine forests
Elevation 400–3300 m (1300–10800 ft)
Distribution
from FNA
AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; BC
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 20, p. 630.
Parent taxa Asteraceae > tribe Senecioneae > Tetradymia
Sibling taxa
T. argyraea, T. axillaris, T. comosa, T. filifolia, T. glabrata, T. nuttallii, T. spinosa, T. stenolepis, T. tetrameres
Synonyms T. inermis
Name authority de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 6: 440. (1838)
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