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Centrostegia thurberi A. Gray ex Benth.  
Family: Polygonaceae
red triangles, more...Red-Triangles, spring flower
[Centrostegia thurberi var. macrotheca (J.T. Howell) Goodman, moreChorizanthe thurberi (A. Gray ex Benth.) S. Wats., Chorizanthe thurberi var. cryptantha Curran, Chorizanthe thurberi var. macrotheca J.T. Howell]
Centrostegia thurberi image
Max Licher
  • FNA
  • Resources
James L. Reveal in Flora of North America (vol. 5)
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. Flowering Mar-Jul. Sandy to gravelly flats and slopes, mixed grassland, saltbush, creosote bush, and chaparral communities, pine-oak and montane conifer woodlands; 300-2400 m; Ariz., Calif., Nev., Utah; Mexico (Baja California, Sonora). 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.

Centrostegia thurberi
Open Interactive Map
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Keir Morse
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The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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