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

Introduction to Vascular Plants


© Hans Roemer     (Photo ID #25703)


E-Flora BC Static Map

Distribution of Allium crenulatum
Click here to view the full interactive map and legend

Species Information

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.

SourceThe Illustrated Flora of British Columbia


If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.


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]

159 160 160
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 2 2
Modal Nutrient Regime
# of field plots
 species was recorded in:
Modal BEC Zone Class

All BEC Zones (# of stations/zone) species was recorded in


Habitat and 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.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Allium cascadense M. Peck
Allium vancouverense Macoun
Allium watsonii Howell