Allium brevistylum |
Allium jepsonii |
|
---|---|---|
short-style onion |
Jepson's 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. |
1–2, not clustered on stout, primary rhizome, ovoid to subglobose, 1.5–2.5 × 1–2 cm; outer coats enclosing single bulb, gray-brown, membranous, lacking cellular reticulation or cells arranged in only 2–3 rows distal to roots, ± quadrate, without fibers; inner coats light brown or 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, 1, basally sheathing, sheath not extending much above soil surface; blade solid, terete, 22–42 cm × 1–4 mm. |
Scape | persistent, solitary, erect, solid, flattened and narrowly winged distally, 20–60 cm × 1.5–4 mm. |
persistent, solitary, erect, solid, terete, 25–37 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, ± compact, 20–60-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 3–4, 4–5-veined, ovate, ± equal, apex long-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, 7–8.5 mm; tepals erect, white, flushed with pink near dark pink midveins, ovate-elliptic, ± equal, becoming papery in fruit, margins erose, apex acute to apiculate, outer tepals with reflexed tips; stamens included; anthers yellow; pollen yellow; ovary crested; processes 6, prominent, ± triangular, margins erose; style linear, equaling stamens; stigma capitate, 3-lobed, lobes slender, recurved; pedicel 7–20 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 jepsonii |
|
Phenology | Flowering Jun–Aug. | Flowering late May–early Jul. |
Habitat | Swampy meadows and along streams, rarely on wooded slopes | Clay soils, including serpentine |
Elevation | 2200–3400 m (7200–11200 ft) | 300–600 m (1000–2000 ft) |
Distribution |
CO; ID; MT; NM; UT; WY
|
CA |
Discussion | Allium brevistylum is found only in the Rocky Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Allium jepsonii is disjunct in the foothills of the Sierra Nevada. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 26, p. 246. | FNA vol. 26. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. sanbornii var. jepsonii | |
Name authority | S. Watson: Botany (Fortieth Parallel), 350. (1871) | (Ownbey & Aase ex Traub) S. S. Denison & McNeal: Madroño 36: 127. (1989) |
Web links |