Allium madidum

Allium madidum, common name mountain swamp onion, is a plant species native to the west-central Idaho (Valley, Adams, and Washington Counties), southern Washington (Walla Walla County) and eastern Oregon. It grows in wet meadows at elevations of 1100–2000 m.Flora of North America v 26 p 255, Allium madidumBONAP (Biota of North America Project), floristic synthesis Allium madidum

Allium madidum produces 1-3 bulbs with as many as 30 smaller bulbils attached. The full-size bulbs are round to egg-shaped, up to 1.6 cm long. Flowers are bell-shaped, up to 10 mm across; tepals white with green or pink midveins; pollen yellow.Sereno Watson. 1879. Proceedings of the American Academy of Arts and Sciences 14: 228.Hitchcock, C. H., A.J. Cronquist, F. M. Ownbey & J. W. Thompson. 1969. Vascular Cryptogams, Gymnosperms, and Monocotyledons. 1: 1–914. In C. L. Hitchcock Vascular Plants of the Pacific Northwest. University of Washington Press, Seattle. Flowers bloom May to July.

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