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Olympic onion, scalloped onion

Siskiyou 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.

1–5; increase bulbs absent or more or less equaling parent bulbs, never appearing as basal cluster; ovoid;

outer coats enclosing renewal 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.

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

blades solid; flat, falcate, 8–18 cm × 3–6 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.

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

wing margins commonly minutely serrulate proximal to umbel, 3–8 cm × 1–4 mm.

Umbels

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

pedicels 6–16 mm;

spathe bracts 2.

persistent; erect; compact, 10–35-flowered, hemispheric;

pedicels 5–16 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.

8–11 mm;

tepals erect, lanceolate to elliptic; more or less equal, pink, usually with darker pink midveins; outer margins entire; inner margins usually minutely denticulate distally;

apex obtuse;

margins becoming more or less involute, appearing acuminate in age;

stamens included;

ovary obscurely crested with 3 minute processes;

stigma scarcely thickened, unlobed.

2n

=14.

=14.

Allium crenulatum

Allium siskiyouense

Distribution
[WildflowerSearch map]
[BONAP county map]
[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.

Rocky, clay, or sandy soils, usually on serpentine. Open ridgetops, slopes, and forest openings. Flowering May–Jul. 300–2100 m. Casc, CR, Sisk. CA. Native.

Allium siskiyouense is known only from SW Oregon and NW California.

Source Flora of Oregon, volume 1, page 138
Nick Otting, Richard Brainerd, Barbara Wilson
Flora of Oregon, volume 1, page 143
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
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. tolmiei, A. triquetrum, A. unifolium, A. validum, A. vineale
Synonyms Allium cascadense, Allium watsonii
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