Allium constrictum |
Allium cratericola |
|
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Grand Coulee onion |
Cascade onion |
|
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. |
1–3, not clustered on stout primary rhizome, ovoid, 1.5–2.5 × 1–2 cm; outer coats enclosing 1 or more bulbs, brown or gray, membranous, lacking cellular reticulation or cells arranged in only 2–3 rows distal to roots, ± quadrate, without fibers; inner coats white, cells obscure, ± quadrate, or not visible. |
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. |
usually deciduous with scape, withering from tip at anthesis, 1–2, basally sheathing, sheaths not extending much above soil surface; blade solid, straight or weakly falcate, flat or broadly channeled, 10–30 cm × 1–21 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. |
usually forming abcission layer and deciduous with leaves after seeds mature, frequently breaking at this level after pressing, solitary, erect, solid, terete, 2–12 cm × 1–3 mm. |
Umbel | persistent, erect, compact, 15–30-flowered, hemispheric to globose, bulbils unknown; spathe bracts persistent, 3, 5–7-veined, ovate, ± equal, apex acute. |
persistent, erect, compact, 20–30-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2–4(–6), 10–16-veined, ovate, ± equal, apex acuminate. |
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. |
campanulate, 7–14 mm; tepals erect, white or pink to purplish with dark greenish brown or purple midveins, lance-oblong, elliptic, or ± oblanceolate, ± equal, becoming papery and investing fruit, margins entire, apex obtuse; stamens included; anthers yellow; pollen yellow; ovary crested; processes 3, central, rounded, minute, margins entire; style linear, equaling stamens; stigma capitate, scarcely thickened, unlobed; pedicel 5–18 mm. |
Seed | coat shining; cells smooth. |
coat dull; cells ± smooth. |
2n | = 14. |
= 14, 28. |
Allium constrictum |
Allium cratericola |
|
Phenology | Flowering May–Jul. | Flowering Mar–Jun. |
Habitat | Shallow, lithosolic soils, often dry and sandy | Serpentine, volcanic, and granitic soil |
Elevation | 300–500 m (1000–1600 ft) | 300–1800 m (1000–5900 ft) |
Distribution |
WA
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CA
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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.) |
Populations of Allium cratericola from southern California are 2-leaved, while those from the north are either 1- or 2-leaved or sometimes a mixture of both forms. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 26. | FNA vol. 26, p. 271. |
Parent taxa | Liliaceae > Allium | Liliaceae > Allium |
Sibling taxa | ||
Synonyms | A. douglasii var. constrictum | A. parvum var. brucae, A. parvum var. jacintense |
Name authority | (Ownbey & Mingrone) P. M. Peterson: Syst. Bot. 13: 211. (1988) | Eastwood: Leafl. W. Bot. 1: 132. (1934) |
Web links |