Allium acuminatum |
Allium dictuon |
|
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Hooker's onion, taper-tip onion |
Blue Mountain onion |
|
Bulbs | 1–12+, not basally clustered, not forming rhizomes, ovoid to ± globose, 0.8–1.6 × 0.9–1.6 cm; outer coats enclosing 1 or more renewal bulbs, ± yellow-brown, prominently cellular-reticulate, membranous, cells square or polygonal, walls thick, obscurely sinuous, without fibers; inner coats white, cells obscure, ± quadrate. |
usually solitary, forming rhizomes; rhizomes 1–2, terminated by 1–3 new bulbs, short, slender; parent bulb disappearing by anthesis except for still-functional roots and bulb coats, not basally clustered, oblique-ovoid, 1–1.5 × 0.9–1.5 cm; outer coats not enclosing bulbs, pale brown, prominently cellular-reticulate, membranous, cells polygonal to oblong, walls thick, obscurely sinuous, without fibers; inner coats white, cells ± transversely elongate, intricately contorted. |
Leaves | persistent, withering from tip by anthesis, 2–3, basally sheathing, sheaths not extending much above soil surface; blade solid, subterete or ± channeled, 7–30 cm × 1–3 mm, margins entire. |
persistent, withering from tip by anthesis, 2–3, basally sheathing, sheaths not extending much above soil surface; blade solid, subterete to ± channeled, 10–28 cm × 1–2 mm, margins entire. |
Scape | persistent, solitary, erect, solid, terete, 10–35 cm × 1–3 mm. |
persistent, solitary, erect, solid, terete, 20–40 cm × 1–3 mm. |
Umbel | persistent, erect, loose, 10–40-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2, 3–7-veined, lanceolate to ovate, ± equal, apex acuminate. |
persistent, erect, loose, 10–25-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2, 3-veined, lanceolate to lance-ovate, ± equal, apex acuminate. |
Flowers | campanulate, 8–15 mm; tepals erect, pink to rose-purple, or white, lanceolate to lance-ovate, unequal, becoming rigid and keeled in fruit, margins finely denticulate (inner tepal more prominently so), apex acuminate, outer tepal longer and wider than inner, spreading to recurved at tip, inner tepal with strongly recurved tips; stamens included; anthers yellow; pollen yellow; ovary crested; processes 3, central, 2-lobed, rounded, minute, margins entire; style linear, equaling stamens; stigma capitate, scarcely thickened, obscurely 3-lobed; pedicel 6–25 mm. |
campanulate, 11–16 mm; tepals erect, pink to rose-purple, lanceolate, unequal, outer tepal longer and wider than inner, becoming rigid and keeled in fruit, margins finely denticulate (inner tepal more prominently so), apex acute to narrowly obtuse, becoming involute and appearing long-acuminate, flaring toward tips; stamens included; anthers yellow; pollen yellow; ovary crested; processes 3, central, 2-lobed, rounded, minute, margins entire; style linear, equaling stamens; stigma capitate, scarcely thickened, obscurely 3-lobed; pedicel 10–25 mm. |
Seed | coat dull or shining; cells minutely roughened. |
coat shining; cells minutely roughened. |
2n | = 14. |
= 14. |
Allium acuminatum |
Allium dictuon |
|
Phenology | Flowering Apr–Jul. | Flowering Jun–Jul. |
Habitat | Dry slopes and plains | Rocky, sandy, basaltic soil |
Elevation | 100–1500 m (300–4900 ft) | 1500 m (4900 ft) |
Distribution |
AZ; CA; CO; ID; NV; OR; UT; WA; WY; BC
|
WA
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Discussion | Of conservation concern. Allium dictuon is known only from the vicinity of Weller’s Butte, Blue Mountains. It differs from A. acuminatum by its rhizomatous habit, in which it resembles A. bolanderi, and in the cellular pattern on the inner bulb coats. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 26, p. 261. | FNA vol. 26, p. 261. |
Parent taxa | Liliaceae > Allium | Liliaceae > Allium |
Sibling taxa | ||
Synonyms | A. acuminatum var. cuspidatum, A. cuspidatum | |
Name authority | Hooker: Fl. Bor.-Amer. 2: 184, plate 196. (1838) | H. St. John: Proc. Biol. Soc. Wash. 50: 3, fig. 1. (1937) |
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