Chorizanthe blakleyi |
Chorizanthe xanti |
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Blakley's spineflower |
riverside spineflower, Xantus' spineflower |
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Habit | Plants spreading to ascending, 0.5–1.5 × 0.5–3 dm, thinly pubescent. | Plants erect to infrequently spreading, (0.3–)0.5–2.5(–3) × 0.5–3(–5) dm, thinly pubescent. | ||||
Leaves | basal; petiole 0.5–2 cm; blade oblanceolate, 0.5–2.5 × 0.3–0.8 cm, thinly pubescent. |
basal or nearly so; petiole 1–2(–3) cm; blade oblong or oblong-ovate to ovate, 0.3–1(–1.5) × 0.3–0.8(–1) cm, thinly pubescent adaxially, densely tomentose abaxially. |
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Inflorescences | with involucres in dense clusters 1–2 cm diam., yellowish green; bracts 2, without whorl of sessile bracts about midstem, usually leaflike, oblanceolate, 0.5–1.5 cm × 1.5–3 mm, gradually reduced and becoming scalelike at distal nodes, linear, aciculate, acerose, 0.3–0.8 cm × 1–2 mm, awns straight, 1–2.5 mm. |
mostly flat-topped and openly branched, usually reddish; bracts persistent, 2, usually leaflike at proximal nodes and similar to proximal leaf blades only more reduced, short-petiolate, oblong-ovate to ovate, 0.3–0.8 cm × 2–6 mm, becoming sessile, reduced and scalelike at distal nodes, linear, acicular, often acerose, 0.1–0.4 cm × 0.5–1 mm, awns straight, 0.5–1 mm. |
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Involucres | 3–10+, yellowish green, urceolate, slightly ventricose basally, 3–4.5 mm, slightly corrugate, without scarious or membranous margins, thinly pubescent; teeth spreading, unequal, 1–3 mm; awns straight or uncinate with longer anterior one straight or slightly curved, mostly 2 mm, others uncinate, 0.5–1.5 mm. |
in open clusters with 1 at node of dichotomies, reddish, cylindric, not ventricose, 3–4.5 mm, not corrugate, without scarious or membranous margins, thinly to densely pubescent; teeth spreading, unequal, 0.7–1.5 mm, 3 longer ones more erect than 3 shorter and less-prominent ones; awns uncinate, 0.5–1 mm. |
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Flowers | exserted; perianth bicolored with floral tube greenish white to white and the lobes white to pinkish, cylindric, 5–6 mm, sparsely pubescent; tepals connate 2/3 their length, dimorphic, obovate, those of outer whorl erect, slightly longer than those of inner whorl, 2-lobed apically, those of inner whorl erect, 2-lobed, erose apically; stamens 9, included; filaments distinct, 5–5.5 mm, glabrous; anthers yellow to golden, oblong, 1–1.2 mm. |
long-exserted; perianth rose to red, infrequently with white lobes, cylindric, 4.5–6 mm, pubescent; tepals connate ca. 2/3 their length, monomorphic to slightly dimorphic, narrowly oblanceolate, rounded apically, those of outer whorl occasionally slightly broader and longer than those of inner whorl; stamens 9, mostly included; filaments distinct, 4–6 mm, glabrous; anthers pink to red, oblong, 0.5–0.6 mm. |
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Achenes | brown, globose-lenticular, 3–3.5 mm. |
brown, lenticular, 4–4.5 mm. |
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2n | = ca. 38. |
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Chorizanthe blakleyi |
Chorizanthe xanti |
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Phenology | Flowering May–Jul. | |||||
Habitat | Sandy or gravelly flats and slopes, chaparral communities, oak woodlands | |||||
Elevation | 600-1600 m (2000-5200 ft) | |||||
Distribution |
CA |
CA
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Discussion | Of conservation concern. Chorizanthe blakleyi is known only from north-facing slopes and foothills of the Sierra Madre. The species is rare and localized. The yellowish green stem, branches, and involucres readily distinguish it. The white flowers align it with C. obovata. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 5, p. 459. | FNA vol. 5, p. 463. | ||||
Parent taxa | ||||||
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Name authority | Hardham: Leafl. W. Bot. 10: 95. (1964) | S. Watson: Proc. Amer. Acad. Arts 12: 272. (1877) | ||||
Web links |