Panicum saugulnale. Crab grass, finger graas. (a.) In the middle States this troublesome grass abounds in gar dens in the latter part of summer, and is 'frequent alao in. Indian corn fields, hut they may be kept in tolerable sub jection by the early and faithful use of the inatrnment known as tbe cultivator. The crab-grass is regarded as a serious pest in the plantations along the lower Miestsal ppi. Panicum capillare. Hair-like Panicum, Old Witch grass, (a.) This worthless species flourishes hest in a light sandy soil, but is usually more or less abundant in corn-fields. In autumn the dry culms break off and the light-spreading paniclea are railed over the fields by the winds, until they accumulate in great quantities along fence and hedge rows.
Panicum crus-galli. Cock-foot Panicum, barnyard graft', (a.) This coarse homely grass is said to be an inhabitant of all quarters of the globe. Itis usually found in the latter part of summer, rather abundant along draius of barnyards and other waste places.
Selaria glauca. Thistly Fox-tail grass, (a.) All our weed like species of this genus are believed to be natu ralized straugers here. This one usually make. its appear ance iu abundance amoug the stubble, at ter a wheat crop, and is frequent in pastures, orchards, etc., when not kept down by a more valuable growth. The S. viridis, called green fox-tail or bottle grass, is about equally worthless, but not quite so prevalent.
Setaria virticellata, (a..) The adhesive bristles of this epecies, frequenting gardens and neglected lots, are cal culated to make it something of a nuisance if permitted to become abundant.
Cenchrus tribuloidos. Bur grass, hedge-hog graae, (a.) This pestilential nnisance is quite abundant in the sandy districts of New jersey and along the great no: them lakes.
Cynodon clactylon. Dog's-tooth grass, Bermuda grass, (p.) Of this grass, which haa found its way from Europe into Virginia and other southern States, Mr. Elliott remarks; The cultivation of it on the poor Mid extensive sand-hills of our middle country, (viz., in South Carolina,) would probably convert them into sheep-walks of great value; but it grows in every soil, and no grass in close, rich land, is more formidable to the cultivator. It must, therefore, he introduced with caution.
Bromus secalinus. Cheat, chess, broom gr ,ss, (a,) Thie ia a well known intruder among our crop. of wheat and rye, and often appears in the same fields for a year or two after the crops, but is soon choked out by the peren nial grasses. This plant is an annual, and easy to over come by care in sowing clean wheat, by keeping,' fence corners and field borders clear, and in establishing proper rotation in cropping. The vulgar error that this grass is merely transmuted wheat, came to es with the earliest immigrants, and, notwithstanding the boasted march of mind, it yet prevails among a certain cla,s of farmer, to a considerable extent.
Triticum repens. Couch grass. gnitch grass, (p.) This specie!! of triticum, which is quite distiuct in habit from cultivatea wheat, has found its way into some dis tricts of our country, and is a pernicious intruder, when fully introduced, by reasou of the exceediug tenacity of life in its rhizomes, or creeping subterranean steins.
Andropogon nutans. Wood grass, Indian graas, (p.) This and two or three other species of native Indian grasses are common in our aterile grounds, and are no better than mere weeds.