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Geyer's onion

twincrest onion

Bulbs

2–10+; ovoid or slightly elongate;

outer coats enclosing 1 or more bulbs, reticulate;

cells rather coarse-meshed; open, fibrous.

1–7+, commonly producing either a cluster of stalked;

basal bulbils or filiform rhizomes to 10 cm, terminated by bulbils;

rhizomes usually lost when specimens are collected; ovoid;

outer coats enclosing 1 or more bulbs, membranous, obscurely cellular-reticulate;

cells rectangular;

walls minutely sinuous; vertical, varying to irregular; all sinuous; without fibers.

Leaves

persistent, usually green at anthesis, usually 3–5;

blades solid; more or less straight; flat, channeled; (6)12– 30 cm × 1–3(5) mm.

persistent, green at anthesis, 2–5;

blades solid; flat, broadly channeled, 8–30 cm × 1–13 mm.

Scapes

persistent; solitary; erect; terete or somewhat 2-angled, 10–50 cm × 1–3 mm.

persistent; solitary or clustered, 1–3; erect; solid; terete, 10–30(40) cm × 1–5 mm.

Umbels

persistent; erect; compact, 10–25-flowered, hemispheric to globose, not producing bulbils, or 0–5-flowered, largely replaced by ovoid, acuminate bulbils;

pedicels becoming rigid and stiffly spreading in fruit, 8–13 mm;

spathe bracts 2–3.

persistent; erect; loose, 15–40-flowered, globose;

pedicels 10–20 mm, often becoming flexuous and deflexed in fruit;

spathe bracts 2.

Flowers

(4)6–8(10) mm;

tepals erect or spreading; ovate to lanceolate; more or less equal, pink to white;

margins often obscurely toothed;

apex obtuse to acuminate;

stamens included;

ovary when present, inconspicuously crested with 3–6 low processes;

stigma unlobed or obscurely lobed.

7–10 mm;

tepals spreading, lanceolate; more or less equal; lilac to white, becoming papery in fruit, not keeled;

margins entire;

apex acuminate, not involute;

stamens included;

ovary conspicuously crested with 6 triangular processes;

stigma unlobed.

2n

=14, 28.

Allium geyeri

Allium bisceptrum

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

2 varieties.

Meadows and aspen groves, less commonly on open slopes in mountains, grasslands with juniper, pumice barrens. Flowering Jun–Jul. 1400–2000 m. BW, ECas, Owy. CA, ID, NV; southeast to NM. Native.

Source Flora of Oregon, volume 1, page 139
Nick Otting, Richard Brainerd, Barbara Wilson
Flora of Oregon, volume 1, page 136
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. 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. 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
Subordinate taxa
A. geyeri var. geyeri, A. geyeri var. tenerum
Synonyms Allium bisceptrum var. bisceptrum
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