D. E. Boufford

42909

2011-07-12

United States of America (美國)

Vermont

W-72°32'30", N44°6'24"

275

with Acer negundo, small trees of Ulmus and vines of Vitis climbing on Ulmus. Dry edge of field in clayey loam

Old field with various grasses, Asclepias syriaca, daucus carota, Lotus corniculatus, Melilotus alba, Solidago canadensis and Vicia cracca

Stems clumped; florets blue or whitish blue