OregonFlora: Allium constrictum vs. Allium douglasii

	Allium constrictum	Allium douglasii
		Douglas onion
Bulbs		1–4; ovoid; outer coats enclosing 1 or more bulbs, membranous, lacking cellular reticulation, or cells arranged in only 2–3 rows adjacent to roots; more or less quadrate; without fibers.
Leaves		usually persistent, green at anthesis, 2; blades solid; flat, falcate, 9–28 cm × (2)5–15 mm.
Scapes		persistent; solitary; erect; solid; terete, not expanded proximal to inflorescence; (10)20–30(40) cm × 1–4 mm.
Umbels		persistent; erect; compact, 25–50-flowered, hemispheric to globose; pedicels 15–30 mm; spathe bracts 3.
Flowers		(6)7–8(10) mm; tepals spreading from base, narrowly lanceolate; more or less equal, light pink to purple with prominent green midribs; margins entire; apex acuminate; stamens equaling tepals or exserted; ovary crested with 6 low processes; stigma unlobed.
2n		=14.

	Allium constrictum	Allium douglasii
Distribution	[WildflowerSearch map] [BONAP county map]	[WildflowerSearch map] [BONAP county map]
Discussion		Winter-wet, shallow soils on rock outcrops. Flowering May–Jul. 400–1400 m. BW, Col, Lava. WA. Native.
Source		Flora of Oregon, volume 1, page 138 Nick Otting, Richard Brainerd, Barbara Wilson
Sibling taxa	A. acuminatum, A. ampeloprasum, A. amplectens, A. anceps, A. bisceptrum, A. bolanderi, A. brandegeei, A. campanulatum, A. cernuum, A. crenulatum, A. dictuon, A. douglasii, A. falcifolium, A. fibrillum, A. geyeri, A. lemmonii, A. macrum, A. madidum, A. membranaceum, A. nevadense, A. nevii, A. nigrum, A. parvum, A. peninsulare, A. platycaule, A. punctum, A. robinsonii, A. sanbornii, A. schoenoprasum, A. siskiyouense, A. tolmiei, A. triquetrum, A. unifolium, A. validum, A. vineale	A. acuminatum, A. ampeloprasum, A. amplectens, A. anceps, A. bisceptrum, A. bolanderi, A. brandegeei, A. campanulatum, A. cernuum, A. crenulatum, A. dictuon, A. falcifolium, A. fibrillum, A. geyeri, A. lemmonii, A. macrum, A. madidum, A. membranaceum, A. nevadense, A. nevii, A. nigrum, A. parvum, A. peninsulare, A. platycaule, A. punctum, A. robinsonii, A. sanbornii, A. schoenoprasum, A. siskiyouense, A. tolmiei, A. triquetrum, A. unifolium, A. validum, A. vineale
Synonyms		Allium douglasii var. douglasii
Web links	Local floras: WA Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: OR, WA Local Web sites: Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Allium constrictum

Allium douglasii

Douglas onion

Bulbs

1–4; ovoid;

outer coats enclosing 1 or more bulbs, membranous, lacking cellular reticulation, or cells arranged in only 2–3 rows adjacent to roots; more or less quadrate; without fibers.

Leaves

usually persistent, green at anthesis, 2;

blades solid; flat, falcate, 9–28 cm × (2)5–15 mm.

Scapes

persistent; solitary; erect; solid; terete, not expanded proximal to inflorescence; (10)20–30(40) cm × 1–4 mm.

Umbels

persistent; erect; compact, 25–50-flowered, hemispheric to globose;

pedicels 15–30 mm;

spathe bracts 3.

Flowers

(6)7–8(10) mm;

tepals spreading from base, narrowly lanceolate; more or less equal, light pink to purple with prominent green midribs;