Allium triquetrum |
Allium howellii |
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three-corner leek, three-cornered leek, white flower onion |
Howell's 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. |
usually solitary, not clustered on stout, primary rhizome, ovoid to ± globose, 0.9–1.7 × 0.8–2 cm; outer coats enclosing bulb, dark reddish brown, membranous, lacking cellular reticulation or cells arranged in only 2–3 rows distal to roots, ± quadrate, without fibers; inner coats light brown to white, cells obscure, quadrate. |
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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. |
persistent, withering from tip by anthesis, 1, basally sheathing, sheath not extending much above soil surface; blade solid, terete, 20–55 cm × 1–4 mm. |
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Scape | persistent, clustered, 1–4, erect, solid, sharply 3-angled, 10–40 cm × 1–10 mm. |
persistent, solitary, erect, solid, terete, 15–60 cm × 1–3.5 mm. |
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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, 15–100-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2–4, 5–8-veined, lanceolate to broadly ovate, ± equal, apex mucronate to acuminate or long-acuminate. |
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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. |
stellate to ± campanulate, 5–8 mm; tepals spreading to ± erect, white to pink or pale lavender with darker midveins, ovate to oblong, ± equal, becoming papery in fruit, margins entire, apex obtuse; stamens ± equaling tepals to long-exserted; anthers yellow or purple; pollen yellow; ovary crested; processes 6, prominent, ± triangular, margins ± irregularly denticulate to laciniate; style linear, equaling stamens or longer; stigma capitate, 3-lobed, lobes slender, recurved; pedicel 6–25 mm. |
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Seed(s) | coat dull; cells minutely roughened. |
coat dull or shining; cells minutely roughened. |
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2n | = 18. |
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Allium triquetrum |
Allium howellii |
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Phenology | Flowering Mar–Apr. | |||||||||
Habitat | Disturbed sites | |||||||||
Elevation | 0–100 m (0–300 ft) | |||||||||
Distribution |
CA; sw Europe [Introduced in North America]
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CA
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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.) |
Varieties 3 (3 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 26, p. 257. | FNA vol. 26, p. 250. | ||||||||
Parent taxa | Liliaceae > Allium | Liliaceae > Allium | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Name authority | Linnaeus: Sp. Pl. 1: 300. (1753) | Eastwood: Leafl. W. Bot. 2: 109. (1938) | ||||||||
Web links |