Allium douglasii Hook.

Douglas' onion (en)

Species

Angiosperms > Asparagales > Amaryllidaceae > Allium

Characteristics

Bulbs 1–4, not clustered on stout, primary rhizomes, ovoid, 1.2–3 × 1–2 cm; outer coats enclosing 1 or more bulbs, light brown, membranous, lacking cellular reticulation, or cells arranged in only 2–3 rows distal to roots, ± quadrate, without fibers; inner coats white, sometimes pink, cells obscure, quadrate or linear. Leaves usually persistent, green at anthesis, 2, basally sheathing, sheaths not extending much above soil surface; blade solid, flat, falcate, 9–28 cm × (2–)5–15 mm, margins entire. Scape persistent, solitary, erect, solid, terete, not expanded proximal to inflorescence, (10–)20–30(–40) cm × 1–4 mm. Umbel persistent, erect, compact, 25–50-flowered, hemispheric to globose, bulbils unknown; spathe bracts persistent, 3, 4–6-veined, ovate, ± equal, apex acute. Flowers ± stellate, (6–)7–8(–10) mm; tepals spreading, light pink to purple with prominent green midribs, narrowly lanceolate, ± equal, becoming papery in fruit, margins entire, apex acuminate; stamens equaling tepals or exserted; anthers blue-gray; pollen white to light gray; ovary crested; processes 6, 2 per lobe, low, rounded, margins entire; style exserted, linear; stigma capitate, unlobed; pedicel 15–30 mm. Seed coat shining; cells smooth. 2n = 14.
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An onion family bulb plant. It grows to 30 cm high and spreads to 12 cm across.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination entomogamy
Spread -
Mature width (meter) 0.12
Mature height (meter) 0.3
Root system rhizome
Rooting depth (meter) 0.2
Root diameter (meter) -
Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway c3

Environment

It occurs naturally on low hills in shallow soil that is wet in winter but dry in summer Western North America from Washington to Oregon and Idaho.
More
Low hills in shallow soil that is wet in winter but dry in summer. Winter-wet, shallow soils on rock outcrops; at elevations from 400-1,300 metres.
Light 6-8
Soil humidity 2-5
Soil texture 3-5
Soil acidity 4-7
Soil nutriment -
Hardiness (USDA) 5-8

Usage

The bulbs are eaten raw or cooked. The leaves are eaten raw or cooked. The flowers are used raw to flavour salads.
Uses medicinal
Edible bulbs flowers leaves roots
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

It can be grown from seed or division of the bulbs. Bulbs should be planted fairly deeply.
Mode divisions seedlings
Germination duration (days) 30 - 365
Germination temperacture (C°) 10
Germination luminosity light
Germination treatment stratification
Minimum temperature (C°) -23
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Allium douglasii unspecified picture

Distribution

Allium douglasii world distribution map, present in United States of America

Identifiers

LSID urn:lsid:ipni.org:names:527957-1
WFO ID wfo-0000756130
COL ID 65XBY
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Allium hendersonii Allium douglasii Allium douglasii var. douglasii