Distinguishing Mustard Varieties
Barnyardgrass seedling. Photo by Steve Dewey of Utah State University, via Bugwood.org
Early Plants
Early plants can be typically be identified according to their cotyledon, first true leaves, and/or the stem.
Mature Plants
Non-flowering/Basal rosette
Flowering plants
References
Uva R H, Neal J C, DiTomaso J M. 1997. Weeds of the Northeast. Book published by Cornell University, Ithaca NY. The go-to for weed ID in the Northeast; look for a new edition sometime in 2019.
Cornell University’s Turfgrass and Landscape Weed ID app. Identification and control options for weeds common to turf, agriculture, and gardens in New York; uses a very simple decision tree to identify your weed.