Allium brevistylum |
Allium amplectens |
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short-style onion |
narrow-leaf onion, slim-leaf onion |
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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. |
1–15+, increase bulbs absent or ± equaling parent bulbs, never appearing as basal cluster, not clustered on stout primary rhizome, ovoid to ± globose, 0.6–1.5 × 0.6–1.3 cm; outer coats enclosing 1 or more bulbs, brown, prominently cellular-reticulate, membranous, cells in ± vertical rows, forming irregular herringbone pattern, transversely elongate, V-shaped, without fibers; inner coats usually dark red, sometimes white to pink, 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 at anthesis, 2–4, basally sheathing, sheaths not extending much above soil surface; blade solid, subterete or ± channeled, 10–36 cm × 0.5–2 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, 15–50 cm × 3–5 mm. |
Umbel | persistent, erect, loose, 7–20-flowered, subhemispheric, bulbils unknown; spathe bracts persistent, 2, 3–5-veined, ovate, ± equal, apex acute. |
shattering after seeds mature, each flower deciduous with its pedicel as a unit, erect, compact, 10–50-flowered, hemispheric, bulbels unknown; spathe bracts persistent, 2–3, 6–13-veined, ovate, ± equal, apex short-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. |
stellate, 5–9 mm; tepals spreading at anthesis, white to pink, lanceolate, ± equal, becoming papery and connivent over capsule, margins entire, apex acute; stamens included; anthers yellow or purple; pollen yellow; ovary crested; processes 6, lateral, ± prominent, ± rectangular, margins entire; style linear, equaling stamens; stigma capitate, scarcely thickened, unlobed; pedicel 4–16 mm. |
Seed | coat dull or shining; cells each with minute, central papilla, or obscurely and minutely roughened. |
coat dull; cells minutely roughened. |
2n | = 14. |
= 14, 21, 28. |
Allium brevistylum |
Allium amplectens |
|
Phenology | Flowering Jun–Aug. | Flowering Apr–Jul. |
Habitat | Swampy meadows and along streams, rarely on wooded slopes | Clay soils, including serpentine, dry slopes, and open plains |
Elevation | 2200–3400 m (7200–11200 ft) | 0–1800 m (0–5900 ft) |
Distribution |
CO; ID; MT; NM; UT; WY
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CA; OR; WA; BC
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Discussion | Allium brevistylum is found only in the Rocky Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
All three chromosome races of Allium amplectens are widespread. The triploids are achiasmatic, causing a breakdown in the first meiotic division. This is followed by a normal second division resulting in pollen dyads that are, presumably, nonfunctional; seeds are produced by apomixis. The diploids and tetraploids produce normal pollen, in tetrads, that appears to be functional. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 26, p. 246. | FNA vol. 26, p. 262. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. acuminatum var. gracile, A. attenuifolium, A. attenuifolium var. monospermum, A. monospermum, A. occidentale, A. serratum | |
Name authority | S. Watson: Botany (Fortieth Parallel), 350. (1871) | Torrey: Pacif. Railr. Rep. 4(5): 148. (1857) |
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