Allium crenulatum |
Allium bolanderi |
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Olympic onion, scalloped onion |
Bolander's 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. |
1–6+, not basally clustered, replaced annually by new bulbs borne terminally on rhizomes; rhizomes 1–3, inconspicuous, slender, less than 2 cm including renewal bulb; parent bulbs disappearing by anthesis except for still-functional roots and bulb coat, oblique-ovoid to ± oblong, 0.7–1.4 × 0.5–1.2 cm; outer coats not enclosing bulbs, brown to gray-brown, ± obscurely reticulate, membranous, reticulum delicate, cells transversely elongate, V-shaped or ± wavy, forming obscure herringbone pattern, without fibers; inner coats white, cells obscure, quadrate to ± rectangular, often contorted. |
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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, withering from tip at anthesis, 2–3, basally sheathing, sheaths not extending much above soil surface; blade solid, subterete to ± channeled, 9–30 cm × 1–2 mm, margins entire. |
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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, 10–35 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 to loose, 10–20-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2, 4–6-veined, lanceolate to lance-ovate, ± 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. |
conic to campanulate, 7–14 mm; tepals erect, reddish purple, rarely white, narrowly lanceolate to lance-ovate, ± equal, becoming rigid and carinate in fruit, margins finely denticulate (inner tepal more prominently so), apex acute to obtuse, becoming involute at tip and appearing acuminate; stamens included; anthers yellow; pollen yellow; ovary crested; processes 3, central, 2-lobed, minute, margins entire; style linear, equaling stamens; stigma capitate, obscurely 3-lobed, scarcely thickened; pedicel 10–20 mm. |
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Seed | coat shining; cells smooth. |
coat dull; cells minutely roughened. |
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2n | = 14. |
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Allium crenulatum |
Allium bolanderi |
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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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CA; OR
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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). The varieties of Allium bolanderi are extremely difficult to distinguish in the absence of bulb material. Care must be taken to obtain good bulb material whenever collecting Allium, but it is extremely critical in this species. (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. 259. | ||||
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: Proc. Amer. Acad. Arts 14: 229. (1879) | ||||
Web links |