Allium brevistylum |
Allium acuminatum |
|
---|---|---|
short-style onion |
Hooker's onion, taper-tip onion |
|
Bulbs | 2–4, terminating thick, iris-like rhizome, elongate, 2–3 × 0.6–1 cm; outer coats enclosing single bulb, grayish or brownish, membranous, minutely striate, cells in parallel vertical rows, narrow, elongate, not fibrous-reticulate, fibers persistent, parallel, few, coarse; inner coats whitish, cells narrowly vertically elongate. |
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. |
Leaves | persistent, green at anthesis, 2–5, basally sheathing, sheaths not extending much above soil level; blade solid, flat, 10–40 cm × 2–8 mm, margins entire. |
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. |
Scape | persistent, solitary, erect, solid, flattened and narrowly winged distally, 20–60 cm × 1.5–4 mm. |
persistent, solitary, erect, solid, terete, 10–35 cm × 1–3 mm. |
Umbel | persistent, erect, loose, 7–20-flowered, subhemispheric, bulbils unknown; spathe bracts persistent, 2, 3–5-veined, ovate, ± equal, apex acute. |
persistent, erect, loose, 10–40-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2, 3–7-veined, lanceolate to ovate, ± equal, apex acuminate. |
Flowers | narrowly urceolate, 10–13 mm; tepals erect, pink, lanceolate, ± equal, withering in fruit, margins entire, apex acuminate, midribs somewhat thickened; stamens included, ca. 1/2 as long as tepals; anthers yellow; pollen light yellow; ovary crestless; style linear, equaling stamens; stigma capitate, distinctly 3-lobed; pedicel 8–35 mm, elongating and becoming stout and curved in fruit. |
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. |
Seed | coat dull or shining; cells each with minute, central papilla, or obscurely and minutely roughened. |
coat dull or shining; cells minutely roughened. |
2n | = 14. |
= 14. |
Allium brevistylum |
Allium acuminatum |
|
Phenology | Flowering Jun–Aug. | Flowering Apr–Jul. |
Habitat | Swampy meadows and along streams, rarely on wooded slopes | Dry slopes and plains |
Elevation | 2200–3400 m (7200–11200 ft) | 100–1500 m (300–4900 ft) |
Distribution |
CO; ID; MT; NM; UT; WY
|
AZ; CA; CO; ID; NV; OR; UT; WA; WY; BC
|
Discussion | Allium brevistylum is found only in the Rocky Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 26, p. 246. | FNA vol. 26, p. 261. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. acuminatum var. cuspidatum, A. cuspidatum | |
Name authority | S. Watson: Botany (Fortieth Parallel), 350. (1871) | Hooker: Fl. Bor.-Amer. 2: 184, plate 196. (1838) |
Web links |