Chorizanthe robusta |
Chorizanthe howellii |
|||||
---|---|---|---|---|---|---|
robust spineflower, Scotts Valley spineflower |
Howell's spineflower, Mendocino spineflower |
|||||
Habit | Plants erect to spreading or decumbent, 0.5–3 × 0.1–6 dm, villous. | Plants spreading or decumbent to somewhat erect, 0.3–1 × 1–5 dm, villous. | ||||
Leaves | basal or nearly so; petiole 1–4(–7) cm; blade oblanceolate, 1.5–5 × 0.2–0.7(–1) cm, villous. |
basal or nearly so; petiole 1–4 cm; blade spatulate to broadly obovate, 1–3 × 0.5–1.5(–1.8) cm, villous. |
||||
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. |
with secondary branches suppressed, greenish to grayish; bracts 2, similar to proximal leaf blades only reduced, short-petiolate, becoming linear and aciculate at distal nodes, acerose, 1–5 cm × 5–15 mm, awns absent. |
||||
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. |
1, greenish to grayish, broadly cylindric, not ventricose, 3–4 mm, with conspicuous, white, scarious margins between teeth and extending up awn, not corrugate, pubescent; teeth spreading, equal, 0.5–1 mm, awns straight with longer ones 1–2 mm and anterior one mostly 2 mm, these alternating with shorter (0.5–1 mm) ones. |
||||
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. |
exserted; perianth bicolored with floral tube white and tepals white to rose, cylindric, (3–)3.5–4.5 mm, pubescent nearly throughout; tepals connate 1/4 their length, dimorphic, oblong, truncate and erose to denticulate apically, those of outer lobes longer and wider than inner ones; stamens 9, included; filaments distinct, 3–4 mm, glabrous; anthers pink to red, oblong, 0.6–0.8 mm. |
||||
Achenes | light brown, globose-lenticular, 3.5–4 mm. |
light brown, globose-lenticular, 3–4.5 mm. |
||||
2n | = (72, 74, 76, 78), 80, (82, 84, 86, 88, 90). |
|||||
Chorizanthe robusta |
Chorizanthe howellii |
|||||
Phenology | Flowering May–Jul. | |||||
Habitat | Sandy places in coastal dunes and grassland communities | |||||
Elevation | 0-20 m (0-100 ft) | |||||
Distribution |
wc Calif
|
CA |
||||
Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Chorizanthe howellii is an octoploid probably derived from an ancient hybrid event involving C. cuspidata var. villosa and perhaps C. valida. It is known only from a dune area north of Fort Bragg in Mendocino County, and is federally listed as endangered. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
||||
Key |
|
|||||
Source | FNA vol. 5, p. 455. | FNA vol. 5, p. 456. | ||||
Parent taxa | ||||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Name authority | Parry: Proc. Davenport Acad. Nat. Sci. 5: 176. (1889) | Goodman: Ann. Missouri Bot. Gard. 21: 44, plate 3, fig. 1. (1934) | ||||
Web links |