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.

Fig 12. [Large Crab-Grass. Finger Grass. Digitaria sanguinalis] (L.) Scop. Panicum sanguinale L. Syntherisma (L.) Nash.

Large Crab-Grass. Finger Grass. Digitaria sanguinalis (L.) Scop. Panicum sanguinale L. Syntherisma (L.) Nash. Spikelets before severe rubbing, oblong, acute, 2.5–3.5 mm. long, first glume on flattened side minute, second on rounded side about half as long as the spikelet, pubescent or nearly smooth, third glume more or less pubescent, 5–7-nerved; floret, after severe rubbing, smooth, edges of floral glume thin. Introduced from Europe. Roots very tough and coming from the lower joints.

Fig 13. [Barnyard Grass. Echinochloa Crus-galli] (L.) Beauv. Panicum Crus-galli L.

Barnyard Grass. Echinochloa Crus-galli (L.) Beauv. Panicum Crus-galli L. Florets oval, white, yellowish gray or brown, 2.4–3 mm. long, plano-convex, glume on the convex side, highly polished, three obscure longitudinal nerves. Native of this country.