E-Flora BC: Electronic Atlas of the Flora of British Columbia

Allium crenulatum Wiegand
Olympic onion
Amaryllidaceae (Lily family)
(Previously in Liliaceae)

Introduction to Vascular Plants

© Hans Roemer  Email the photographer   (Photo ID #25703)

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Distribution of Allium crenulatum
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Species Information

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Perennial herb from a lopsided-egg-shaped, scaly bulb, the outer scales papery-white or greyish, without a fibrous network; flowering stems ascending to erect, 5-8 cm tall, flattened, 2-angled or -winged, the margins obscurely scalloped.
Basal leaves usually 2, flattened, curved and hooked at the tips, distinctly longer than the flowering stem, 1-3 mm wide, smooth, the margins sometimes minutely toothed; stem leaves lacking.
Inflorescence a compact, terminal umbel of several to many, stalked flowers, above 2 membranous, broadly lanceolate bracts, the stalks about as long as the flowers; flowers pink to rose-purple, bell-shaped, of 6 distinct tepals, the tepals 6-12 mm long, oblong-lanceolate tapering to pointed tips; stamens 6, about 2/3 as long as the tepals; pistil 1, 3-chambered.
Capsules, more or less egg-shaped, 3-lobed, with 6 low, rounded crests; seeds 6 or fewer, black.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry rock outcrops and rockslides in the lowland, montane and subalpine zones; rare on S Vancouver Island and the Gulf Islands; S to WA and SW OR.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Allium crenulatum

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres) 1450 1450 1450
Slope Gradient (%) 30 30 30
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
160 159 160
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 2 2
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: MS(1)


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Allium cascadense M. Peck
Allium vancouverense Macoun
Allium watsonii Howell

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References