Bulbs 1-10+, not clustered on stout primary rhizome, rhizomes absent, bulbs absent or ± equaling parent bulbs, never appearing as basal cluster, subglobose, 1-2 × 1-2 cm; outer coats enclosing renewal bulbs, brown, cellular-reticulate, membranous, reticulum delicate, cells ± quadrate, without fibers; inner coats white, cells obscure, ± rectangular, vertically elongate. Leaves persistent, green at anthesis, 2-3, sheathing proximal 1/5-1/4 scape; blade solid, flat, not falcate, carinate, 15-50 cm × 5-20 mm, margins entire to denticulate. Scape persistent, solitary, erect, solid, ± triquetrous, 2-edged or slightly winged proximally, terete distally, 20-60 cm × 2-7 mm. Umbel persistent, erect, loose, 10-25-flowered, ± hemispheric, bulbils unknown; spathe bract persistent, 1, 8-9-veined, ovate, ± equal, equaling pedicel, apex acute. Flowers ± erect, saucer-shaped, 7-12 mm; tepals spreading, white, broadly elliptic, ± equal, becoming membranous and connivent over capsule, margins entire, apex obtuse; stamens included; anthers yellow; pollen yellow; ovary crestless; style linear, ± equaling stamens; stigma capitate, scarcely thickened, unlobed; pedicel 15-35 mm. Seed coat not known. Flowering Mar--Apr. Disturbed sites; 0--100 m; introduced; Calif.; s Europe. Allium neapolitanum is a garden escape, introduced from southern Europe.