Chorizanthe xanti |
Chorizanthe douglasii |
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riverside spineflower, Xantus' spineflower |
Douglas' spineflower, San Benito spineflower |
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Habit | Plants erect to infrequently spreading, (0.3–)0.5–2.5(–3) × 0.5–3(–5) dm, thinly pubescent. | Plants erect, 1–4(–5) × 0.5–3 dm, villous. | ||||
Leaves | 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. |
basal; petiole 1–3(–6) cm; blade oblanceolate, 0.5–2(–4) × 0.1–0.4(–1) cm, villous. |
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Inflorescences | 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. |
cymose, dichotomously branched throughout, white to greenish or reddish; bracts usually 2, similar to proximal leaf blades, typically with whorl of 3–5 ca. midstem, short-petiolate, becoming linear and aciculate at distal nodes, acerose, 0.5–2(–3) cm × 1–5(–10) mm, awns absent. |
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Involucres | 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. |
congested in small leafy terminal clusters of 2–4 at nodes of dichotomies, greenish, cylindric, slightly ventricose basally, 3–5 mm, with conspicuous, purple, broad, membranous margins typically extending across sinuses, finely corrugated, hispid at least along ridges, otherwise sparsely pubescent; teeth spreading, equal, (0.7–)1–1.5 mm, awns straight, 0.5–1 mm. |
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Flowers | 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. |
exserted; perianth white to rose, cylindric, 3.5–4(–4.5) mm, slightly pubescent abaxially; tepals connate 2/3 their length, monomorphic, obovate, 2-lobed or denticulate apically, infrequently inner whorl entire; stamens 9, slightly exserted; filaments distinct, 3–4 mm, glabrous; anthers pink to red, oblong, 0.5–0.6 mm. |
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Achenes | brown, lenticular, 4–4.5 mm. |
light brown, globose-lenticular, 3.5–4 mm. |
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2n | = 40. |
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Chorizanthe xanti |
Chorizanthe douglasii |
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Phenology | Flowering Apr–Jul. | |||||
Habitat | Sandy to gravelly flats and slopes, mixed grassland communities, oak and pine woodlands | |||||
Elevation | (200-)300-1600 m ((700-)1000-5200 ft) | |||||
Distribution |
CA
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CA
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Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Chorizanthe douglasii is restricted to the Santa Lucia Mountains and to the San Gabilan and La Panza ranges of west-central California. The species is infrequent but can be locally common. A single collection made in the Santa Cruz Mountains (Rowntree s.n., 16 Jun 1929, CAS) may have been made in Santa Cruz County, but the location is uncertain and no other collection is known from that region. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 5, p. 463. | FNA vol. 5, p. 452. | ||||
Parent taxa | ||||||
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Synonyms | C. nortonii | |||||
Name authority | S. Watson: Proc. Amer. Acad. Arts 12: 272. (1877) | Bentham: Trans. Linn. Soc. London 17: 418. (1836) | ||||
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