Allium amplectens

Torrey

Pacif. Railr. Rep. 4(5): 148. 1857

Synonyms: Allium acuminatum var. gracile Alph. Wood Allium attenuifolium Kellogg Allium attenuifolium var. monospermum (Jepson) Jepson Allium monospermum A. Gray Allium occidentale S. Watson Allium serratum unknown
Treatment appears in FNA Volume 26. Treatment on page 262. Mentioned on page 231, 263.
Bulbs 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, 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, terete, 15–50 cm × 3–5 mm. Umbel 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 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; cells minutely roughened. 2n = 14, 21, 28.

Phenology: Flowering Apr–Jul.
Habitat: Clay soils, including serpentine, dry slopes, and open plains
Elevation: 0–1800 m

Distribution

B.C., Calif., Oreg., Wash.

Discussion

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.

References

None.

Lower Taxa

No lower taxa listed.