Restricted Noxious Weeds 
Agronomy 105's Weed ID
Buckhorn plantain
Buckhorn plantain is a perennial that is often found infesting perennial pastures and lawns. 
Buckhorn plants have a deep taproot and a low, rosette-type growth pattern.
In Buckhorn's early spring rosette stage, it will have long, narrow, dark green leaves.  Because of this rosette growth pattern, mowing is not an effective means of control, however, 2,4-D will kill it quite easily.
The seed from Buckhorn plantain is oblong shape, and will vary in color from light brown to nearly black and is indented on one side giving it a canoe-shaped appearance.  The seed appears shiny because it is covered by a substance that causes the seed to become sticky when wet.  This is important because Buckhorn often infests alfalfa and red clover fields that are being grown for seed.  Because Buckhorn and alfalfa seed are similar in size and shape, they are difficult to separate.  The fact that buckhorn seed becomes sticky when moist, can be used to aid in separation.  When the seed mixture is wetted, the sticky buckhorn seed will cling to rollers which the alfalfa seed passes through and thus the two are separated.