Flora of North America species comparison

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Centrostegia thurberi

red triangles, Thurber spiny herb, Thurber's spineflower
Habit Plants 0.3–2(–3) × (0.6–)1–4(–5) dm.
Leaf

blades (0.5–)1–3.5(–4) × 0.3–0.8(–1) cm.
Inflorescences

bracts mostly spreading, (1–)2–6(–10) mm;

awns 1–2 mm.
Involucres

(2–)3–6(–8) mm;

basal spurs with awns 0.2–2 mm;

teeth flattened and keeled distally, awn erect, short, 0.3–1 mm.
Flowers

perianth 2–3(–3.5) mm;

tepals oblanceolate;

filaments 1–3 mm;

anthers 0.4–0.5 mm.
Achenes

2–2.5 mm.
2n

= 38.

Centrostegia thurberi
Phenology Flowering Mar–Jul.
Habitat Sandy to gravelly flats and slopes, mixed grassland, saltbush, creosote bush, and chaparral communities, pine-oak and montane conifer woodlands
Elevation 300-2400 m (1000-7900 ft)
Distribution
from FNA
AZ; CA; NV; UT; Mexico (Baja California, Sonora)
[WildflowerSearch map]
[BONAP county map]
Discussion

Centrostegia thurberi is fairly consistent morphologically throughout its range except for individuals in some populations in the mountains of the southern Coast Ranges that tend to have slightly longer and more robust involucres. The name var. macrotheca is available for such plants.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 5, p. 473.
Parent taxa Polygonaceae > subfam. Eriogonoideae > Centrostegia
Synonyms C. thurberi var. macrotheca, Chorizanthe thurberi, Chorizanthe thurberi var. macrotheca
Name authority A. Gray: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 14: 27. (1856)
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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