ke teeth on the margins. Waste places, thin meadows. Introduced
from Europe.

[Illustration: Fig. 6.]

=Smooth Brome-grass.= _Bromus racemosus_ L. Florets about 9 mm. long,
awn 6-10 mm. long; longer, softer, thinner, with longer awn than found
in florets of _B. secalinus_ which see. Not often seen in this country.
Introduced from Europe.

[Illustration: Fig. 7.]

=Chess Cheat.= _Bromus secalinus_ L. Florets swollen a little above the
middle, the floral glume rounded on the back, obscurely 7-nerved, 6-7
mm. long, an awn 3-4 mm. long, more or less; palea covering the concave
side, each edge bearing a single row of stiff hairs; glume and palea
closely adhering to the grain. Introduced from Europe. A weed in wheat
fields.

[Illustration: Fig. 8.]

=Barren Brome Grass.= _Bromus sterilis_ L. Floral glume minutely
roughened, adhering to the grain; 5-7 nerved; 11-15 mm. long;
compressed; concave in section. Introduced from Europe, becoming common
in the state.

[Illustration: Fig. 9.]

=Sand-Bur. Bur-Grass.= _Cenchrus tribuloides_ L. Spikelets consisting of
the grain and its coverings, broad oval, somewhat flattened, about 7 mm.
long, thinly covered by stiff, straight, barbed, prickles, 2-5 mm.
long, making a disagreeable and formidable bur, often common on sandy
land. Native of this country.

[Illustration: Fig. 10.]

=Bermuda Grass.= _Cynodon Dactylon_ L., Pers., (Capriola Dactylon (L.)
Kuntze). Floral glume enclosing the grain, smooth, light colored, oval
to half-oval, 1.5 to 2 mm. long, in cross section with two long sides
and a short side half as long; grain light brown, obovate to oval, a
small nipple at the larger end.

The plant seeds in hot countries but not in cool, temperate regions;
spreading chiefly by coarse, hard rootstocks. Introduced.

[Illustration: Fig. 11.]

=Small Crab-Grass.= _Digitaria humifusa_ Pers. _Panicum lineare_ Kroach.
_Syntherisma linearis_ (Kroch.) Nash. Spikelets in the rough, before
severe rubbing, ovoid or oblong, flattened, 2 mm. long, first glume
minute, second and third as long as the spikelet, soft with very short
hairs, one of them 3-nerved, the other 5-nerved; floret after severe
rubbing, brown to black, smooth, floral glume of the rounded side
curving over the edges below covering with their edges about two-thirds
of the palea. Introduced from Europe; becoming troublesome on thin
lawns.

[Illustration: Fig. 12.]

=Large Crab-Grass. Finger Grass.= _Digitaria sangui