Allium crenulatum |
Allium atrorubens |
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Olympic onion, scalloped onion |
dark red onion, red onion |
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Bulbs | 1–6+, replaced annually with new bulbs borne terminally on rhizomes; rhizomes 1–2, secondary, short; parent bulb disappearing by anthesis except for still-functional roots and shriveled bulb coat, oblique-ovoid, 1–2 × 0.8–1.8 cm; outer coats not or only partially enclosing bulbs, brown to gray-brown, membranous, lacking cellular reticulation or cells arranged in only 2–3 rows distal to roots, ± quadrate, without fibers; inner coats white, cells very obscurely quadrate or not visible. |
1–3, not clustered on primary rhizome, with 0–2 stalked basal bulbels, ovoid to globose, 1–1.6 × 0.8–1.4 cm; outer coats enclosing 1 or more bulbs, brown, membranous, lacking cellular reticulation or cells arranged in only 2–3 rows distal to roots, ± quadrate, without fibers; inner coats pink or white, cells obscure, quadrate. |
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Leaves | usually deciduous with scape, withering from tip at anthesis, (1–)2, basally sheathing, sheaths not extending much above soil surface; blade solid, flat, falcate, 10–33 cm × 1.5–10 mm, margins sometimes minutely denticulate. |
persistent, 1, basally sheathing, sheath not extending much above soil level; blade solid, terete, 8–22 cm × 1–2.5 mm. |
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Scape | usually forming abcission layer and deciduous with leaves after seeds mature, frequently breaking at this level after pressing, solitary, ± erect, solid, flattened, winged distally, wings frequently crenulate proximal to umbel, 5–15 cm × 1–5 mm. |
persistent, solitary, erect, solid, terete, 5–17 cm × 1–3 mm. |
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Umbel | persistent, erect, compact, 10–25-flowered, conic to hemispheric, bulbils unknown; spathe bracts persistent, 2, 8–10-veined, lanceolate, ± equal, apex acute. |
persistent, erect, ± compact, 5–50-flowered, hemispheric to globose, bulbils unknown; spathe bracts persistent, (2–)3, 3–6-veined, ovate to lanceolate, ± equal, apex acuminate. |
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Flowers | campanulate, 6–12 mm; tepals erect, pinkish with deeper pink midveins, lanceolate, ± equal, becoming papery in fruit, margins entire, apex acute; stamens included; anthers yellow or purple; pollen yellow; ovary obscurely crested; processes 3, central, 2-lobed, minute, margins entire; style linear, equaling stamens; stigma capitate, scarcely thickened, unlobed; pedicel 6–16 mm. |
campanulate, 8–12 mm; tepals erect, pale pink to deep reddish purple, rarely white, lanceolate to ovate, ± equal or inner longer and narrower than outer, becoming rigid and ± keeled in fruit, margins entire, apex acute to acuminate; stamens included; anthers purple; pollen white or light yellow; ovary crested; processes 6, prominent, ± triangular, margins entire to notched or shallowly toothed; style linear, equaling stamens; stigma obscurely capitate, scarcely thickened, unlobed; pedicel 10–22 mm. |
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Seed | coat shining; cells smooth. |
coat dull or shining; cells minutely roughened. |
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2n | = 14. |
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Allium crenulatum |
Allium atrorubens |
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Phenology | Flowering late May–Jul. | |||||
Habitat | Talus slopes and clay soils, including serpentine, on bald summits and ridges | |||||
Elevation | 600–2500 m (2000–8200 ft) | |||||
Distribution |
OR; WA; BC
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Intermountain w United States
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Discussion | Allium crenulatum is known only from west of the Cascade Mountains from Vancouver Island to southwestern Oregon, in Jefferson Park, Oregon, and in the Wenatchee Mountains, central Washington. The disjunct populations of Allium crenulatum in western Oregon are markedly different among themselves and from the more typical representatives to the north. It has thus far proven impossible to draw meaningful taxonomic distinctions among these populations, hence we have followed historical precedent and have placed them all in a single, highly variable species. (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. 26, p. 274. | FNA vol. 26, p. 248. | ||||
Parent taxa | Liliaceae > Allium | Liliaceae > Allium | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | A. cascadense, A. vancouverense, A. watsonii | |||||
Name authority | Wiegand: Bull. Torrey Bot. Club 26: 135, plate 355, fig. 1. (1899) | S. Watson: Botany (Fortieth Parallel), 352, plate 38, figs. 4, 5. (1871) | ||||
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