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broadstem onion, flatstem onion

Bulbs

1–5+; ovoid; renewal bulbs formed within coats of parent bulb; more or less equaling parent bulbs;

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

blades solid; flat, falcate, 10–30 cm × (6)8–18 mm.

Scapes

usually forming abscission layer and deciduous with leaves after seeds mature; solitary; erect; solid, strongly flattened, winged distally, 7–25 cm × 2–7 mm.

Umbels

persistent; erect; loose, 30–90-flowered, globose;

pedicels 10–25 mm;

spathe bracts 2–5.

Flowers

8–15 mm;

tepals spreading, narrowly lanceolate; more or less equal, bright pink to rose;

margins entire;

apex long-acuminate;

stamens exserted;

anthers yellow;

ovary crestless;

stigma scarcely thickened, unlobed.

2n

=14.

Allium tuberosum

Allium platycaule

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

Rocky, sandy slopes. Flowering May–Jul. 1300–2500 m. BR, ECas. CA, NV. Native.

Source Flora of Oregon, volume 1, page 142
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. 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. punctum, A. robinsonii, A. sanbornii, A. schoenoprasum, A. siskiyouense, A. tolmiei, A. triquetrum, A. unifolium, A. validum, A. vineale
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