Chorizanthe xanti |
Chorizanthe rectispina |
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riverside spineflower, Xantus' spineflower |
prickly spineflower, straight-awn 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 spreading to decumbent, 0.3–0.8(–1) × 0.5–4(–5) dm, appressed-pubescent. | ||||
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 0.5–2 cm; blade oblanceolate to spatulate, 0.5–1.5(–2) × 0.2–0.6 cm, thinly pubescent. |
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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. |
with involucres in small, open clusters 0.5–1.5 cm diam., greenish to grayish; bracts 2, without whorl of sessile bracts about midstem, usually leaflike, oblanceolate to elliptic, 0.5–1.5 cm × 1.5–5 mm, gradually reduced and becoming scalelike at distal nodes, linear, aciculate, acerose, 0.3–0.8 cm × 1–2 mm, awns straight, 0.5–1.5 mm. |
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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. |
3–10+, grayish to reddish, urceolate, slightly ventricose basally, 2–2.5(–3) mm, slightly corrugate, without scarious or membranous margins, densely pubescent; teeth spreading, unequal, 1–2 mm; awns straight or uncinate, unequal, with longer anterior one straight, mostly 1.5–2.5 mm, others uncinate, 0.3–0.6 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 bicolored with floral tube yellow and tepals yellow or white, cylindric, 3.5–4 mm, sparsely pubescent; tepals connate 1/2 their length, dimorphic, obovate, those of outer whorl white, obovate to nearly orbiculate, 3–4 times longer than those of inner whorl, , truncate to slightly 2-lobed apically, those of inner lobes erect, yellow, broadly obovate, truncate and erose apically; stamens 9, included; filaments distinct, 1–1.5 mm, glabrous; anthers yellow to golden, oblong, 0.5–0.6 mm. |
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Achenes | brown, lenticular, 4–4.5 mm. |
brown, globose-lenticular, 3–3.5 mm. |
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2n | = (36), 40, (44). |
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Chorizanthe xanti |
Chorizanthe rectispina |
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Phenology | Flowering May–Jul. | |||||
Habitat | Sandy to gravelly flats and slopes, mixed grassland communities, pine-oak woodlands | |||||
Elevation | 200-600 m (700-2000 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.) |
Of conservation concern. Chorizanthe rectispina is infrequent and localized in the Coast Ranges of west-central California. (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. 460. | ||||
Parent taxa | ||||||
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Subordinate taxa | ||||||
Name authority | S. Watson: Proc. Amer. Acad. Arts 12: 272. (1877) | Goodman: Ann. Missouri Bot. Gard. 21: 72. (1934) | ||||
Web links |