Chorizanthe watsonii |
Chorizanthe robusta |
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five-tooth spineflower, Watson's spineflower |
robust spineflower, Scotts Valley spineflower |
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Habit | Plants spreading to erect, 0.2–1(–1.5) × 0.2–1(–1.5) dm, densely canescent-strigose. | Plants erect to spreading or decumbent, 0.5–3 × 0.1–6 dm, villous. | ||||
Leaves | basal or nearly so; petiole (0.5–)1–2.5(–3) cm; blade oblanceolate, (0.3–)0.5–1.5(–2) × 0.2–0.4(–0.5) cm, thinly floccose to sparsely tomentose. |
basal or nearly so; petiole 1–4(–7) cm; blade oblanceolate, 1.5–5 × 0.2–0.7(–1) cm, villous. |
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Inflorescences | with involucres in small clusters 0.5–1 cm diam., greenish to reddish; bracts 2, with laminar ones oblanceolate, (0.5–)0.8–1.5(–2) cm × (1–)2–4 mm, those at distal nodes becoming sessile, reduced and scalelike, linear-lanceolate, acicular, awns slightly curved, 0.5–1 mm. |
with secondary branches not suppressed except in terminal clusters of involucres, green to reddish; bracts 2, similar to proximal leaf blades only reduced, short-petiolate, becoming linear and aciculate at distal nodes, acerose, 1–5 cm × 2–5(–7) mm, awns absent. |
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Involucres | 1, green, cylindric, 5-ribbed, 3–4.5 mm, finely corrugate, pubescent; teeth 5, erect, unequal, with leaflike, narrowly lanceolate, 2–6 mm anterior tooth, others linear, 1–2 mm; awn uncinate, 0.4–0.8(–1) mm. |
1, greenish, cylindric, not ventricose, 2.5–4 mm, with white to pinkish, thin scarious margins restricted to basal portion of teeth, not corrugate, thinly pubescent abaxially; teeth spreading, equal, 0.3–0.8(–1) mm; awns uncinate with longer ones 0.7–1.3 mm and anterior one mostly 1–1.3 mm, these alternating with shorter (0.3–0.7 mm) ones. |
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Flowers | 1, included to slightly exserted; perianth yellow, cylindric, 1.5–2.5 mm, thinly pubescent abaxially; tepals connate ca. 2/3 their length, monomorphic, oblong, acute, entire apically, mostly erect; stamens 3 or 9, slightly exserted; filaments distinct, 0.8–1 mm, glabrous; anthers yellow, ovate, 0.2–0.3 mm. |
slightly exserted; perianth bicolored with floral tube white and tepals white to rose, cylindric, 2.5–4 mm, pubescent abaxially; tepals connate 1/4 their length, monomorphic, oblanceolate to narrowly oblong, usually truncate to rounded and erose or denticulate apically, occasionally distinctly cuspidate; stamens 9, included; filaments distinct, 2–3.5 mm, glabrous; anthers pink to red or maroon, oblong, 0.6–0.8 mm. |
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Achenes | brown, lenticular, 2.5–3 mm. |
light brown, globose-lenticular, 3.5–4 mm. |
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Chorizanthe watsonii |
Chorizanthe robusta |
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Phenology | Flowering Apr–Aug. | |||||
Habitat | Sandy to gravelly flats and slopes, mixed grassland, saltbush and sagebrush communities, pinyon-juniper woodlands | |||||
Elevation | 300-2400 m (1000-7900 ft) | |||||
Distribution |
AZ; CA; ID; NV; OR; UT; WA
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wc Calif
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Discussion | Chorizanthe watsonii is widely distributed in the cold desert of the Great Basin and in the northern part of the warmer Mojave Desert. Plants in the northern part of the range (especially on the Palouse Prairie of south-eastern Washington) usually have three stamens. (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. 468. | FNA vol. 5, p. 455. | ||||
Parent taxa | ||||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Name authority | Torrey & A. Gray: Proc. Amer. Acad. Arts 8: 199. (1870) | Parry: Proc. Davenport Acad. Nat. Sci. 5: 176. (1889) | ||||
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