Allium burlewii |
Allium shevockii |
|
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Burlew's onion |
Spanish needle onion |
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Bulbs | usually solitary, not clustered on stout, primary rhizome, ovoid, 1.5–2.5 × 1–1.5 cm; outer coats enclosing single bulb, brown or grayish, membranous, lacking cellular reticulation or cells arranged in only 2–3 rows distal to roots, ± quadrate, without fibers; inner coats white, cells not visible. |
2–10+, forming threadlike rhizomes, rhizomes 3–10 cm, terminated by bulbels and/or 1–2 basal bulbels that in turn may produce threadlike rhizomes, ± globose, 1–1.5 × 1–1.5 cm; outer coats enclosing single bulb, brown, membranous, lacking cellular reticulation or cells arranged in only 2–3 rows distal to roots, ± quadrate, without fibers; inner coats light yellow, turning reddish on drying, cells obscure, ± quadrate. |
Leaves | usually deciduous with scape, withering from tip at anthesis, 1, basally sheathing, sheath not extending much above soil surface; blade solid, flat or broadly channeled, ± falcate, 8–33 cm × 1–10 mm, margins entire. |
persistent, withering from tip by anthesis, 1, basally sheathing, sheath not extending much above soil surface; blade solid, terete, 20–40 cm × 2–4 mm. |
Scape | usually forming abcission layer and deciduous with leaves after seeds mature, frequently breaking at this level after pressing, solitary, erect, solid, terete, 2–20 cm × 1–3 mm. |
persistent, solitary, erect, solid, terete, 10–20+ cm × 1–5 mm. |
Umbel | persistent, erect, compact, 8–20(–30)-flowered, globose to conic, bulbils unknown; spathe bracts persistent, 3, 9–13-veined, broadly ovate, ± equal, apex abruptly acuminate. |
persistent, erect, compact, 12–30-flowered, globose, bulbils unknown; spathe bracts persistent, usually 3, 5–7-veined, lanceolate, ± equal, apex apiculate. |
Flowers | conical to campanulate, 7–10 mm; tepals strictly erect, dull purplish with darker midveins, ovate, ± equal, becoming membranous, withering in fruit, margins entire, apex obtuse; stamens equaling tepals or ± exserted; filaments smooth proximally; anthers purple; pollen yellow or gray; ovary crestless or crested; processes 6, central, rounded, minute, margins entire; style linear, slightly longer than stamens; stigma capitate, scarcely thickened, unlobed; pedicel 6–10 mm. |
campanulate, 12–14 mm; tepals spreading, unequal; outer tepals maroon, oblanceolate, margins irregularly shallow-toothed, apex acute to mucronate, reflexed-curled; inner tepals maroon distally, white proximally, ovate, withering in fruit, curled back at tip, margins entire, apex acute, reflexed; stamens included; anthers yellow; pollen yellow; ovary crested; processes 6, prominent, narrowly triangular, margins entire, apex emarginate; style linear, equaling stamens; stigma capitate, 3-lobed, lobes slender, recurved; pedicel 10–16 mm. |
Seed | coat shining; cells smooth. |
coat shining; cells minutely roughened. |
2n | = 14. |
= 14. |
Allium burlewii |
Allium shevockii |
|
Phenology | Flowering late Apr–Jul. | Flowering Jun–Jul. |
Habitat | Granite sands, on dry slopes and ridges | Soil pockets on schist outcrops |
Elevation | 1800–2800 m (5900–9200 ft) | 2200–2400 m (7200–7900 ft) |
Distribution |
CA
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CA |
Discussion | Of conservation concern. Allium shevockii is known only from the upper slopes of Spanish Needle Peak in the southern Sierra Nevada and from Horse Canyon, Tehachapi Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 26, p. 273. | FNA vol. 26, p. 252. |
Parent taxa | ||
Sibling taxa | ||
Name authority | Davidson: Bull. S. Calif. Acad. Sci. 15: 17. (1916) | McNeal: Madroño 34: 150, fig. 1. (1987) |
Web links |