Allium triquetrum |
Allium aaseae |
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three-corner leek, three-cornered leek, white flower onion |
Aase's onion, South Idaho onion |
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Bulbs | 5–20+, not clustered on stout primary rhizome, rhizomes absent, increase bulbs absent or ± equaling parent bulbs, never appearing as basal cluster, ovoid, 1–2 × 1–2 cm; outer coats enclosing renewal bulbs, ± translucent, yellow-brown, obscurely cellular-reticulate, thin, membranous, meshes delicate, cells vertically elongate, contorted, without fibers; inner coats white, cells obscure, quadrate, or not visible. |
2–10+, not clustered on stout, primary rhizome, ovoid, 1–2 × 0.8–1.5 cm; outer coats enclosing 1 or more bulbs, brownish, membranous, with or without obscure reticulations, cells isodiametric or transversely elongate, ± contorted, without fibers; inner coats white, pink, or red, cells obscure, ± quadrate. |
Leaves | persistent, green at anthesis, 2–3, basally sheathing, sheaths not extending much above soil surface; blade solid, flat, not falcate, ± carinate, 15–50 cm × 3–15 mm, margins entire. |
usually deciduous with scape, green at anthesis, 2, basally sheathing, sheaths not extending much above soil surface; blade solid, flat to ± terete, channeled, 7–25 cm × 1–4 mm, margins entire or minutely denticulate. |
Scape | persistent, clustered, 1–4, erect, solid, sharply 3-angled, 10–40 cm × 1–10 mm. |
usually forming abcission layer and deciduous with leaves after seeds mature, frequently breaking at this level after pressing, solitary, erect, solid, slightly flattened, with or without narrow, sometimes crenulate-denticulate wings, 5–12 cm × 1–2 mm. |
Umbel | persistent, lax, loose, 3–15-flowered, ± 1-sided, bulbils unknown; spathe bracts persistent, 1–2, 3-veined, narrowly lanceolate, ± equal, apex acute. |
persistent, erect, compact, 5–25-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2–3, 8–11-veined, ovate, ± equal, apex obtuse to acuminate. |
Flowers | becoming pendent, campanulate, 10–18 mm; tepals erect to spreading, white with prominent green midrib, lanceolate, ± equal, becoming membranous in fruit, margins entire, apex acute; stamens included; anthers yellow; pollen yellow; ovary crestless; style linear, ± equaling stamens; stigma capitate, scarcely thickened, unlobed; pedicel 15–25 mm. |
campanulate, 6–9 mm; tepals erect, bright pink fading to white with dark midribs, rarely white, oblong to lanceolate, ± equal, becoming papery in fruit, margins obscurely to distinctly serrulate-denticulate, apex obtuse to acuminate; stamens included; anthers yellow; pollen yellow; ovary crestless; style included, linear; stigma capitate, scarcely thickened, unlobed; pedicel 3–10 mm. |
Seed(s) | coat dull; cells minutely roughened. |
coat shining; cells smooth. |
2n | = 18. |
= 14. |
Allium triquetrum |
Allium aaseae |
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Phenology | Flowering Mar–Apr. | Flowering Apr–May. |
Habitat | Disturbed sites | Coarse, sandy soil and gravelly river benches |
Elevation | 0–100 m (0–300 ft) | 800–1100 m (2600–3600 ft) |
Distribution |
CA; sw Europe [Introduced in North America]
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ID
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Discussion | Allium triquetrum is a garden escape, introduced from southwestern Europe, and is potentially a noxious weed. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Allium aaseae is known only from Ada and southern Gem counties and Rebecca Sand Hill, Washington County, and is considered of conservation concern by the Idaho Department of Fish and Game. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 26, p. 257. | FNA vol. 26, p. 268. |
Parent taxa | Liliaceae > Allium | Liliaceae > Allium |
Sibling taxa | ||
Name authority | Linnaeus: Sp. Pl. 1: 300. (1753) | Ownbey: Res. Stud. State Coll. Wash. 18: 19, fig. 18. (1950) |
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