''Allium macrum'', the rock onion, is an American species of

wild onion Wild onion can refer to * any uncultivated species in the genus '' Allium'', especially: **'' Allium bisceptrum'' ** '' Allium canadense'' ** ''Allium tricoccum ''Allium tricoccum'' (commonly known as ramp, ramps, ramson, wild leek, wood leek, o ...

native to the eastern and central parts of the US States of

Oregon Oregon () is a state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington, while the Snake River delineates much of its eastern boundary with Idaho. T ...

and

Washington Washington commonly refers to: * Washington (state), United States * Washington, D.C., the capital of the United States ** A metonym for the federal government of the United States ** Washington metropolitan area, the metropolitan area centered o ...

. It grows on gravelly soils at elevations up to 1400 m.Flora of North America v 26 p 267, ''Allium macrum''
/ref> It is a perennial herb. ''Allium macrum'' produces round to egg-shaped bulbs up to 2 cm long. Flowers are white with a green stripe running the length of each tepal. Anthers and pollen are yellow.St. John, Harold. 1931. Proceedings of the Biological Society of Washington 44(10): 31–32.
/ref>

References

{{Taxonbar, from=Q15521048 macrum Flora of Washington (state) Flora of Oregon Endemic flora of the United States Plants described in 1879 Taxa named by Sereno Watson Flora without expected TNC conservation status