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Olympic onion, scalloped onion

Bulbs

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

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

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

Scapes

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

pedicels 6–16 mm;

spathe bracts 2.

Flowers

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

=14.

Allium crenulatum

Distribution
[WildflowerSearch map]
[BONAP county map]
Discussion

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 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. 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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