Allium crenulatum |
Allium aaseae |
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Olympic onion, scalloped onion |
Aase's onion, South Idaho 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. |
2–10+, not clustered on stout, primary rhizome, ovoid, 1–2 × 0.8–1.5 cm; outer coats enclosing 1 or more bulbs, brownish, membranous, with or without obscure reticulations, cells isodiametric or transversely elongate, ± contorted, without fibers; inner coats white, pink, or red, cells obscure, ± quadrate. |
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. |
usually deciduous with scape, green at anthesis, 2, basally sheathing, sheaths not extending much above soil surface; blade solid, flat to ± terete, channeled, 7–25 cm × 1–4 mm, margins entire or minutely denticulate. |
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. |
usually forming abcission layer and deciduous with leaves after seeds mature, frequently breaking at this level after pressing, solitary, erect, solid, slightly flattened, with or without narrow, sometimes crenulate-denticulate wings, 5–12 cm × 1–2 mm. |
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, 5–25-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2–3, 8–11-veined, ovate, ± equal, apex obtuse to acuminate. |
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, 6–9 mm; tepals erect, bright pink fading to white with dark midribs, rarely white, oblong to lanceolate, ± equal, becoming papery in fruit, margins obscurely to distinctly serrulate-denticulate, apex obtuse to acuminate; stamens included; anthers yellow; pollen yellow; ovary crestless; style included, linear; stigma capitate, scarcely thickened, unlobed; pedicel 3–10 mm. |
Seed | coat shining; cells smooth. |
coat shining; cells smooth. |
2n | = 14. |
= 14. |
Allium crenulatum |
Allium aaseae |
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Phenology | Flowering late May–Jul. | Flowering Apr–May. |
Habitat | Talus slopes and clay soils, including serpentine, on bald summits and ridges | Coarse, sandy soil and gravelly river benches |
Elevation | 600–2500 m (2000–8200 ft) | 800–1100 m (2600–3600 ft) |
Distribution |
OR; WA; BC
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ID
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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.) |
Allium aaseae is known only from Ada and southern Gem counties and Rebecca Sand Hill, Washington County, and is considered of conservation concern by the Idaho Department of Fish and Game. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 26, p. 274. | FNA vol. 26, p. 268. |
Parent taxa | Liliaceae > Allium | Liliaceae > Allium |
Sibling taxa | ||
Synonyms | A. cascadense, A. vancouverense, A. watsonii | |
Name authority | Wiegand: Bull. Torrey Bot. Club 26: 135, plate 355, fig. 1. (1899) | Ownbey: Res. Stud. State Coll. Wash. 18: 19, fig. 18. (1950) |
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