200609 Narrowleaf Cow-wheat (Melampyrum lineare) - USDA Illustration
%20-%20USDA%20Illustration.jpg "200609 Narrowleaf Cow-wheat (Melampyrum lineare) - USDA Illustration.jpg")
Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states
and Canada. Vol. 3
USDA, NRCS. 2012. The PLANTS Database (http://plants.usda.gov). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.