Trifo.ium armee. Stone Clover, Welsh clover, rabbit foot, (a.) This foreign plant is only entitled to notice on account of its worthlessness and prevalence In poor, old fields. Its presence is apretty sure indication of a thin boil aud neglected and the obvious remedy ie to improve both.
Potentilla Canadensis. Cinquefoil, fivefinger, (p.) The varieties of this are rather harmless, though worthless native weeds, aud are merely indications of a neglected soil. There is also a coarse, erect, homely, annual species, P. norvogica, which is becoming a frequent weed in the Middle States, and seems to have migrated from the North.
Rebus vi//oaus. Blackberry Bramble, common brier, (p.) Every one knows the common brier; the fruit in its season is a general favorite, and some remarkably flue varieties have been produced under careful culture. The tendency of the plant, however, to spread and take posses sion of ueglected fields, canoes it to be regarded as some thing of a nuisance where it prevails. Auother and kiu dred species, the R. cuncifoliu8, or Sand Blackberry, has found its way into Pennsylvania, apparently from New Jersey, and bids fair to establish itself in the land of Penn. Fence angles aud waste places in which the briers have obtained a foothold should be cleaned of a 1 weeds twice yearly, in spring and autumu. This will not only exterminate the briers, but admit air and light to the field borders, otherwise shaded.
Rebus Canadensis. Dewberry, running brier, (p ) Our American dewberry is a fine fruit, and generally preferred to all the blackberries proper, but it la not the dewberry of England, which is the robes &mine of Linu,ens. There is scarcely a farmer's boy in Pennsylvania who is not well acquainted with our plant, from having encountered its prickly, trailing stems with his naked ankles while heed lessly traversing the old fields where it abounds On well managed farms, however, this and all other species of brier, (not excepting our native raspberries) are becoming rare.
Rosa Carolina. This is often an obnoxious plant in wet meadows and lowgrounde, forming unsightly thickets with other weeds if neglected. Another native species, R.
ludida, the Dwarf Wild Rose, ie quite frequent in neg The foreign Sweet Brier, Rosa Rubigt nosa, naturalized in many localities and deemed a tres passer.
Sicyos angulatos. One-seeded Star Cucumber. This climbing vine, with leaves resembling those of the encum ber, is a native weed, and a vile nuisance when admitted into gardens and cultivated lots.
Datteus carota Wild Carrot, (b.) When this wild variety of the common garden carrot becomes thoroughly naturalized, as It is now on many farms in the middle States, it is a troublesome weed, and requires persevering vigilance to get rid of it. It should be diligently eradica ted before it ripens its seeds. In Case of snow, with a smooth surface crust, the mature umbels break off and are driven by the wind to a great distance, and thus annoy an extensive district. Another umbelliferoue nuisance is created by permitting the valuable garden parsnip Pasti naca saliva, to disseminate itself and multiply rapidly in adjoining fields, and along fence rows, giving to the farms a very slovenly appearance.
Archemara rigida. Cowbane, wild parsnip, (p.) TBie native weed occurs frequently in swampy meadows, and is reputed to be an active poison when eaten by horned cattle, which, however, probably seldom happens, unless the pasture is very deficient.
dEgupothum podagrarla. Goat Weed, (p.) A foreign weed, troublesome and difficult to eradicate.
Cicuta maculala Water Hemlock, spotted cowbane, mu,quai-h root, (p.) The root of this is poisonous, and proves fatal to children who collect and eat it by mistake for the root of sweet cicely, os•.rhiza longistylis. It is found indigenous along rivulets and margins of swamps, and should be carefully eradicated.
Coniummaculatum. Common or Poison Hemlock, (b.) A poisonous and danger.,us weed, introduced from Europe, and occasionally met with about old settlements. It Is supposed to be the identical herb with which the ancient Greeks put their philosophers and stateemen to death when they got tired of them.