''Allium macrum'', the rock onion, is an

America The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

n species of

wild onion Wild onion can refer to * any uncultivated species in the genus ''Allium'', especially: **'' Allium bisceptrum'' ** ''Allium canadense'' ** ''Allium tricoccum'' ** '' Allium validum'' ** '' Allium vineale'' ** ''Allium ochotense'' * '' Asphodelus te ...

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

Oregon Oregon ( , ) is a U.S. state, state in the Pacific Northwest region of the United States. It is a part of the Western U.S., with the Columbia River delineating much of Oregon's northern boundary with Washington (state), Washington, while t ...

and

Washington Washington most commonly refers to: * George Washington (1732–1799), the first president of the United States * Washington (state), a state in the Pacific Northwest of the United States * Washington, D.C., the capital of the United States ** A ...

. 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 to pale pink 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