Allium acuminatum |
Allium cratericola |
|
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Hooker's onion, taper-tip onion |
Cascade onion |
|
Bulbs | 1–12+, not basally clustered, not forming rhizomes, ovoid to ± globose, 0.8–1.6 × 0.9–1.6 cm; outer coats enclosing 1 or more renewal bulbs, ± yellow-brown, prominently cellular-reticulate, membranous, cells square or polygonal, walls thick, obscurely sinuous, without fibers; inner coats white, cells obscure, ± quadrate. |
1–3, not clustered on stout primary rhizome, ovoid, 1.5–2.5 × 1–2 cm; outer coats enclosing 1 or more bulbs, brown or gray, membranous, lacking cellular reticulation or cells arranged in only 2–3 rows distal to roots, ± quadrate, without fibers; inner coats white, cells obscure, ± quadrate, or not visible. |
Leaves | persistent, withering from tip by anthesis, 2–3, basally sheathing, sheaths not extending much above soil surface; blade solid, subterete or ± channeled, 7–30 cm × 1–3 mm, margins entire. |
usually deciduous with scape, withering from tip at anthesis, 1–2, basally sheathing, sheaths not extending much above soil surface; blade solid, straight or weakly falcate, flat or broadly channeled, 10–30 cm × 1–21 mm, margins entire. |
Scape | persistent, solitary, erect, solid, terete, 10–35 cm × 1–3 mm. |
usually forming abcission layer and deciduous with leaves after seeds mature, frequently breaking at this level after pressing, solitary, erect, solid, terete, 2–12 cm × 1–3 mm. |
Umbel | persistent, erect, loose, 10–40-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2, 3–7-veined, lanceolate to ovate, ± equal, apex acuminate. |
persistent, erect, compact, 20–30-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2–4(–6), 10–16-veined, ovate, ± equal, apex acuminate. |
Flowers | campanulate, 8–15 mm; tepals erect, pink to rose-purple, or white, lanceolate to lance-ovate, unequal, becoming rigid and keeled in fruit, margins finely denticulate (inner tepal more prominently so), apex acuminate, outer tepal longer and wider than inner, spreading to recurved at tip, inner tepal with strongly recurved tips; stamens included; anthers yellow; pollen yellow; ovary crested; processes 3, central, 2-lobed, rounded, minute, margins entire; style linear, equaling stamens; stigma capitate, scarcely thickened, obscurely 3-lobed; pedicel 6–25 mm. |
campanulate, 7–14 mm; tepals erect, white or pink to purplish with dark greenish brown or purple midveins, lance-oblong, elliptic, or ± oblanceolate, ± equal, becoming papery and investing fruit, margins entire, apex obtuse; stamens included; anthers yellow; pollen yellow; ovary crested; processes 3, central, rounded, minute, margins entire; style linear, equaling stamens; stigma capitate, scarcely thickened, unlobed; pedicel 5–18 mm. |
Seed | coat dull or shining; cells minutely roughened. |
coat dull; cells ± smooth. |
2n | = 14. |
= 14, 28. |
Allium acuminatum |
Allium cratericola |
|
Phenology | Flowering Apr–Jul. | Flowering Mar–Jun. |
Habitat | Dry slopes and plains | Serpentine, volcanic, and granitic soil |
Elevation | 100–1500 m (300–4900 ft) | 300–1800 m (1000–5900 ft) |
Distribution |
AZ; CA; CO; ID; NV; OR; UT; WA; WY; BC
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CA
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Discussion | Populations of Allium cratericola from southern California are 2-leaved, while those from the north are either 1- or 2-leaved or sometimes a mixture of both forms. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 26, p. 261. | FNA vol. 26, p. 271. |
Parent taxa | Liliaceae > Allium | Liliaceae > Allium |
Sibling taxa | ||
Synonyms | A. acuminatum var. cuspidatum, A. cuspidatum | A. parvum var. brucae, A. parvum var. jacintense |
Name authority | Hooker: Fl. Bor.-Amer. 2: 184, plate 196. (1838) | Eastwood: Leafl. W. Bot. 1: 132. (1934) |
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