Chorizanthe biloba var. biloba |
Chorizanthe biloba |
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two lobed spineflower, two-lobe spineflower |
two lobed spineflower, twolobe spineflower |
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Habit | Plants erect or infrequently spreading, (0.5–)1–3(–4) × 1–3(–4) dm, pubescent. | |||||
Leaves | basal; petiole 0.5–3 cm; blade oblanceolate, 1–3(–5) × 0.4–1(–1.3) cm, thinly pubescent. |
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Inflorescences | with involucres in open clusters 2–4(–6) cm diam., greenish or reddish to purplish; bracts 2–3 at proximal node, usually leaflike, often with whorl of sessile bracts ca. midstem, elliptic, 0.5–1.5 cm × 2–6 mm, gradually becoming lanceolate to elliptic, 0.2–2 cm × 1.5–8 mm, at distal nodes scalelike, linear and aciculate, acerose, awns straight, 1–3 mm. |
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Involucres | 3–10 or more, grayish or reddish, urceolate and slightly ventricose basally, 4–6 mm, without scarious or membranous margins, slightly corrugate, strigose; teeth erect to spreading, unequal, 1–2 mm; awns mostly uncinate, 0.5–2 mm, with longer anterior one straight, mostly 2 mm. |
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Flowers | exserted; perianth bicolored with floral tube white to yellow and tepals red, maroon, or dark purple, cylindric, (4.5–)5–6 mm, sparsely pubescent; tepals connate 1/2 their length, dimorphic, obovate, those of outer whorl spreading, slightly longer than those of inner whorl, 2-lobed, emarginate, or subacute apically, those of inner whorl erect, obtuse, fimbriate apically; stamens 9, exserted; filaments distinct, 4–5 mm, glabrous; anthers yellow to golden, oblong, 1.2–1.8 mm. |
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Outer tepals | deeply 2-lobed, occasionally erose apically. |
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Achenes | brown, globose-lenticular, 4–4.5 mm. |
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2n | = 40. |
= (34, 36, 38), 40, (42, 44, 46). |
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Chorizanthe biloba var. biloba |
Chorizanthe biloba |
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Phenology | Flowering May–Aug. | |||||
Habitat | Sandy, gravelly or clay soils, grassland communities, pine-oak woodlands | |||||
Elevation | 200-700 m (700-2300 ft) | |||||
Distribution |
CA |
CA
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Discussion | Variety biloba is found from the eastern foothills of the Santa Lucia Mountains of Monterey and San Luis Obispo counties eastward to the western foothills of the Diablo, La Panza, and Temblor ranges, and in extreme western Fresno County. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). Unlike the serpentine species Chorizanthe palmeri and C. ventricosa, C. biloba occurs on gravelly or clayey soils. Those species and C. obovata can be quickly differentiated by carefully examining the colors, shapes, and modifications of the tepals. Immature specimens can be difficult to place, but a combination of geographic location and edaphic features can often enable accurate identification of even fragmentary material. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 5, p. 458. | FNA vol. 5, p. 458. | ||||
Parent taxa | ||||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | C. palmeri var. biloba | |||||
Name authority | unknown | Goodman: Ann. Missouri Bot. Gard. 21: 73. (1934) | ||||
Web links |