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

Allium acuminatum Hook.
Hooker's onion (tapertip onion)
Amaryllidaceae (Lily family)
(Previously in Liliaceae)

Introduction to Vascular Plants

© Gary Ansell  Email the photographer   (Photo ID #12930)

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Distribution of Allium acuminatum
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Species Information

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General:
Perennial herb from an egg-shaped to nearly globe-shaped, scaly bulb, the outer scales brownish, with a prominent fibrous network, the inner scales white; flowering stems erect, 10-30 cm tall, slender, round in cross-section, smooth.
Leaves:
Basal leaves 2 to 3 or more, linear, cylindric, shorter than to about as long as the flowering stem, 1-3 mm wide, smooth, the margins entire; stem leaves lacking.
Flowers:
Inflorescence an open, terminal umbel of several to many, stalked flowers, above 2 membranous, broadly lanceolate bracts, the stalks 1-3 cm long; flowers rose-pink to whitish, bell-shaped, of 6 distinct tepals, the tepals mostly 10-12 mm long, lanceolate, gradually tapering to pointed tips, the inner 3 with fine-toothed margins, the outer 3 larger, entire, the tips widely spreading to curved back; stamens 6, about 2/3 as long as the tepals; pistil 1, 3-chambered.
Fruits:
Capsules, more or less egg-shaped, 3-lobed, with 3 very small, rounded crests; seeds 6 or fewer, dull-black.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Purple
Blooming Period:
Summer
Fruit/Seed characteristics:
Colour: Black
Present from Summer to Fall
Source:  The USDA

Habitat / Range

Dry rocky bluffs, Garry Oak woodlands and meadows in the lowland and steppe zones; infrequent on SE Vancouver Island, the Gulf Islands and the Fraser Valley, north to Lytton and Pemberton; S to NM, AZ and CA.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Allium acuminatum

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

Minimum

Average

Maximum

Elevation (metres) 31 151 285
Slope Gradient (%) 0 41 210
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
38 178 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 1 2
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
40
Modal BEC Zone Class
CDF
All BEC Zones (# of stations/zone) species was recorded in: CDF(10), PP(1)

Ecological Indicator Information

A very shade-intolerant, montane, Western North American forb distributed equally in the Pacific and Cordilleran regions. Occurs in cool temperate and cool mesothermal climates very dry to moderately dry and nitrogen-medium soils. Its occurrence decreases with increasing latitude, precipitation, and continentality. Scattered in the open and in open-canopy forests on water-shedding sites with shallow soils. Characteristic of moisture-deficient sites.

SourceIndicator Plants of Coastal British Columbia (Information applies to coastal locations only)

Climate

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 cool temperate & cool mesothermal.

Synonyms and Alternate Names

Allium acuminatum var. cuspidatum Fernald

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References