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three-corner leek

Olympic onion, scalloped onion

Bulbs

5–20+; increase bulbs absent or more or less equaling parent bulbs, never appearing as basal cluster; ovoid;

outer coats enclosing renewal bulbs; more or less translucent, obscurely cellular-reticulate; thin, membranous; meshes delicate;

cells vertically elongate, contorted; without fibers.

1–6+, replaced annually with new bulbs borne terminally on short; secondary rhizomes, parent bulb disappearing by anthesis except for still-functional roots and shriveled bulb coat, oblique-ovoid;

outer coats not or only partially enclosing bulbs, membranous, lacking cellular reticulation or cells arranged in only 2–3 rows adjacent to roots; more or less quadrate; without fibers.

Leaves

persistent, green at anthesis, 2–3;

blades solid; flat, not falcate; more or less keeled, 15–50 cm × 3–15 mm;

margins entire.

usually deciduous with scape, withering from tip at anthesis; (1)2;

blades solid; flat, falcate, 10–33 cm × 1.5–10 mm.

Scapes

persistent, clustered; erect; solid, sharply 3-angled, 10–40 cm × 1–10 mm.

usually forming abscission layer and deciduous with leaves after seeds mature; solitary; more or less erect; solid, flattened, winged distally;

wings frequently crenulate proximal to umbel, 5–15 cm × 1–5 mm.

Umbels

persistent; lax; loose, 3–15-flowered; more or less 1-sided;

pedicels 15–25 mm;

spathe bracts 1–2.

persistent; erect; compact, 10–25-flowered, conic to hemispheric;

pedicels 6–16 mm;

spathe bracts 2.

Flowers

becoming pendent, 10–18 mm;

tepals erect to spreading, lanceolate; more or less equal, white with prominent green midrib;

margins entire;

apex acute;

stamens included;

ovary crestless;

stigma scarcely thickened, unlobed.

6–12 mm;

tepals erect, lanceolate; more or less equal, white to pinkish with deeper pink, purple or greenish midveins;

margins entire;

apex acute;

stamens included;

ovary obscurely crested with 3 minute, 2-lobed processes;

stigma scarcely thickened, unlobed.

2n

=18.

=14.

Allium triquetrum

Allium crenulatum

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Road ditches, lawns, and other disturbed moist sites. Flowering Apr–Jul. 400–2800 m. BR, BW, Col, ECas, Lava, Owy. CA; Europe. Exotic.

Allium triquetrum is cultivated for its attractive flowers. It readily escapes in south coastal Oregon and California and has potential to become invasive.

Talus slopes and clay soils, including serpentine, on bald summits and ridges. Flowering May–Jul. 0–1400 m. BW, Casc, CR, ECas, Est, WV. WA; north to British Columbia. Native.

Oregon’s Allium crenulatum populations differ morphologically and are quite variable. It is tempting to name some of them, but so far botanists have been unable to find consistent, clear patterns, so all are treated as a single highly variable species.

Source Flora of Oregon, volume 1, page 144
Nick Otting, Richard Brainerd, Barbara Wilson
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. unifolium, A. validum, A. vineale
A. acuminatum, A. ampeloprasum, A. amplectens, A. anceps, A. bisceptrum, A. bolanderi, A. brandegeei, A. campanulatum, A. cernuum, 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
Synonyms Allium cascadense, Allium watsonii
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