Allium constrictum |
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Grand Coulee onion |
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Bulbs | 1–5+, not clustered on stout, primary rhizome, ovoid, 1–1.5 × 0.8–1.4 cm; outer coats enclosing 1 or more bulbs, brownish, membranous, lacking cellular reticulation or cells arranged in only 2–3 rows distal to roots, ± quadrate, without fibers; inner coats white, cells obscure, quadrate. |
Leaves | usually persistent, green at anthesis, 2, basally sheathing, sheaths not extending much above soil surface; blade solid, flat, broadly channeled, falcate, 10–35 cm × 1–3(–5) mm, margins entire. |
Scape | persistent, solitary, erect, solid, terete, enlarged apically but distinctly constricted just proximal to inflorescence, 15–20 cm × 1.5–4 mm. |
Umbel | persistent, erect, compact, 15–30-flowered, hemispheric to globose, bulbils unknown; spathe bracts persistent, 3, 5–7-veined, ovate, ± equal, apex acute. |
Flowers | ± stellate, 7–8 mm; tepals spreading, light pink to rose with prominent green or reddish midribs, narrowly lanceolate, ± equal, becoming papery in fruit, margins entire, apex acuminate; stamens exserted; anthers blue-gray; pollen light blue to gray; ovary crested; processes 6, 2 per lobe, low, rounded, margins entire; style exserted, linear; stigma capitate, unlobed; pedicel 10–20 mm. |
Seed | coat shining; cells smooth. |
2n | = 14. |
Allium constrictum |
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Phenology | Flowering May–Jul. |
Habitat | Shallow, lithosolic soils, often dry and sandy |
Elevation | 300–500 m (1000–1600 ft) |
Distribution |
WA
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Discussion | Of conservation concern. Allium constrictum is known only from Douglas, Grant, and Lincoln counties. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 26. |
Parent taxa | Liliaceae > Allium |
Sibling taxa | |
Synonyms | A. douglasii var. constrictum |
Name authority | (Ownbey & Mingrone) P. M. Peterson: Syst. Bot. 13: 211. (1988) |
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