Chorizanthe robusta |
Chorizanthe robusta var. hartwegii |
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robust spineflower, Scotts Valley spineflower |
robust spineflower, Scott Valley spineflower, Scott's Valley spineflower |
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Habit | Plants erect to spreading or decumbent, 0.5–3 × 0.1–6 dm, villous. | Plants erect, (0.5–)1–3 × (0.1–)1–2.5 dm. | ||||
Leaves | basal or nearly so; petiole 1–4(–7) cm; blade oblanceolate, 1.5–5 × 0.2–0.7(–1) cm, villous. |
blades 1.5–5 × 0.2–0.5(–0.7) cm. |
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Inflorescences | 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, 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. |
2.5–3.5 mm, margins rose-pink. |
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Flowers | 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 | light brown, globose-lenticular, 3.5–4 mm. |
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Chorizanthe robusta |
Chorizanthe robusta var. hartwegii |
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Phenology | Flowering Apr–Jul. | |||||
Habitat | Sandy outcrops, annual grassland communities | |||||
Elevation | 200-300 m (700-1000 ft) | |||||
Distribution |
wc Calif
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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. Variety hartwegii is known from a few populations in Scott Valley, Santa Cruz County. The epithet “hartwegii” was misapplied to Chorizanthe pungens var. hartwegiana until 1989; see B. Ertter (1996) for details. Scott Valley spineflower is federally listed as endangered. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 5, p. 455. | FNA vol. 5, p. 456. | ||||
Parent taxa | ||||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | C. douglasii var. hartwegii, C. pungens var. hartwegii | |||||
Name authority | Parry: Proc. Davenport Acad. Nat. Sci. 5: 176. (1889) | (Bentham) Reveal & Rand. Morgan: Phytologia 67: 358. (1989) | ||||
Web links |