Allium obtusum |
Allium tribracteatum |
|||||
---|---|---|---|---|---|---|
red Sierra onion, red Sierran onion |
three-bract onion |
|||||
Bulbs | 1–5, not clustered on stout primary rhizome, ovoid, 1–2 × 0.8–1.8 cm; outer coats enclosing 1 or more bulbs, brown, membranous, cellular-reticulate, cells quadrate, polygonal, or ± rectangular, ± transversely elongate, without fibers; inner coats white, reticulation absent or cells obscure, ± quadrate. |
generally 2–5+, not clustered on stout primary rhizome, ovoid, 1–2 × 0.8–1.8 cm; outer coats enclosing 1 or more bulbs, brownish, membranous, prominently cellular-reticulate, cells irregularly arranged, ± transversely elongate, curved, without fibers; inner coats white, cells obscure, ± transversely elongate, irregularly arranged, curved. |
||||
Leaves | usually deciduous with scape, withering from tip at anthesis, 1–2, basally sheathing, sheaths not extending much above soil surface; blade solid, flat or broadly channeled, ± falcate, 5–22 cm × 0.5–14 mm, margins entire. |
usually deciduous with scape, withering from tip at anthesis, 2, basally sheathing, sheaths not extending much above soil surface; blade solid, flat or broadly channeled, ± falcate, 12–20 cm × 1–3.5 mm, margins entire. |
||||
Scape | usually forming abcission layer and deciduous with leaves after seeds mature, frequently breaking at this level after pressing, solitary, erect, solid, terete, 2–17 cm × 0.5–2 mm. |
usually forming abcission layer and deciduous with leaves after seeds mature, frequently breaking at this level after pressing, solitary, erect, solid, terete, 2–7 cm × 0.5–1.5 mm. |
||||
Umbel | persistent, erect, compact, 6–65-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2–3(–5), 5-8-veined, ovate, ± equal, apex abruptly acuminate to apiculate. |
persistent, erect, compact, 10–30-flowered, hemispheric, bulbils unknown; spathe bracts persistent, (2–)3(–4), 4–5-veined, ovate, ± equal, apex abruptly acuminate to apiculate. |
||||
Flowers | campanulate, 4–12 mm; tepals erect, white or pink with dark purplish midveins, lanceolate to oblong-elliptic, ± equal, becoming papery in fruit, margins entire, apex obtuse to acute; stamens included; anthers yellow or purple; pollen yellow; ovary crested; processes 3, obscure to ± prominent, rounded, central, margins entire; style linear, equaling stamens or longer; stigma capitate, scarcely thickened, obscurely 3-lobed; pedicel 2–14(–20) mm. |
campanulate, 6.5–8 mm; tepals erect, white to pink with dark pink or purplish midvein, lanceolate to ± elliptic, ± equal, becoming papery in fruit, margins entire, apex acute; stamens included; anthers purple; pollen gray; ovary crested; processes 3, acute, ± lateral, margins entire; style linear, shorter than stamens; stigma capitate, scarcely thickened, unlobed; pedicel 6–9 mm. |
||||
Seed | coat dull; cells ± smooth. |
coat dull; cells ± smooth. |
||||
2n | = 14. |
|||||
Allium obtusum |
Allium tribracteatum |
|||||
Phenology | Flowering Mar–May. | |||||
Habitat | Rocky, volcanic soils | |||||
Elevation | 1300–3000 m (4300–9800 ft) | |||||
Distribution |
CA; NV
|
CA
|
||||
Discussion | Varieties 2 (2 in the flora). Allium obtusum is known only from the Sierra Nevada. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Allium tribracteatum is known only from the Sierra Nevada in Tuolumne County. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
||||
Key |
|
|||||
Source | FNA vol. 26, p. 269. | FNA vol. 26, p. 269. | ||||
Parent taxa | Liliaceae > Allium | Liliaceae > Allium | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Name authority | Lemmon: Pittonia 2: 69. (1890) | Torrey: Pacif. Railr. Rep. 4(5): 148. (1857) | ||||
Web links |