Bhus magnate Poison Snmach, poison elder,(s.) A noxious shrub frequent in moist. low grourds, by which -many persons are liable to be badly poisoned. A similar cutaneona affection is often produced by the climbing variety of another speciee--the Rhea toxicod.ndi on, Poi son Vine or Oak.
Trifoduna arcenee. Stone Clover, Welsh clover, rabbit foot, (a.) This foreign plant is only entitled to notice on account of its worthlessuess and prevaleuce in p tor, old fields. Its presence is a pretty sure indication of a thin soil and neglected agriculture, aud the obvious remedy is to improve both.
Potentilla Canadensis. Cinqnefoil, fivefinger, (p.) The varieties of this are rather barmlesa, though worthless native weeds, sod are merely indications of a neglected noil. There is also a coarse, erect, homely, annual species, P. nontogica, which is becoming a frequent weed In the Middle states, aud seems to have migrated from the North.
Bubus ciltOpii. Blackberry Bramble, common brier, O.) Every one knows the common brier; the fruit in its season is a general favorite, and sume remarkably fine varieties have been produced under careful culture. The tendeucy of the plant, however, to spread and take posses sion of neglected fields, eanses it to be regerded as some thing of a nuisance where it prevails. Another nud kiu dred species, tho cuncifolius, or Sand Blackberry, has found its way into Pennsylvania, apparently fiom New Jersey, and bids fair to establish Itself in the land of Penn. Fence eagles and waete places in which the briers have obtained a foothold should be cleaned of a I weeds twice yearly, io spring and autumn. Tbis will not ouly exterminate the briers, but admit air and light to the field borders, otherwise shaded.
Rebus Canadensis. Dewberry, running brier, tp t Our American dewberry is a fine fruit, and generally preferred to all the blackberries proper, but it is not the dewberry of England, which is the rubus cmstus of Linutene. 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 anklet, whiie heed lessly traversing the old fields where it abounds On well managed forme, however, this and all other species ot brier, (not excepting our native raspberries) are becoming rare.
Rosa Carolina. This is often an obnoxious plaut in wet meadows and low groan de, forming unsightly thickets with other weeds if neglected. Another native species, R. &ciao., the Dwarf Wild Rose, is quite frequent in neg. lected grounds. The foreign Sweet B. ler, Rosa BUtigi nosa, is naturalized in many localities and deemed a tres passer.
Sicyos angulatos. One-seeded Star Cucumber. This climbing vine, with leaves resembling those of the cucum ber, is a native weed, and a vile nuieauce when admitted into gardene and cultivated lots.
Dames ramie. Wild Carrot, (b.) When this wild variety of the common garden carrot becomes thoroughly naturalized, as it la now on many farms in the middle States, it is a tronblesome weed, and requires persevering vigilance to get rid of it. R should be diligently eradica ted before it ripens its seeds. In case of soow, with a smooth surface crust, the [nature umbele breas off and are driven by the wind to a great distance. and thus annoy an exteosive distrIct. Another umbelliferuus nuisance 113 created by permitting the valuable garden parsnip Posh naca dative, to disseminate itself mid mutt ply rapidly in adjoining fields, and along fence I owe, giving to the farma a very sloveuly appearance.
Archemara Cowbane, wild parsnip, (p.) This native weed occurs frequently in swampy meadows, and ia reputed to be an active poison when eaten by horned cattle, which, however, probably seldom happene, unless the pasture is very deficieot.
.Xgupodiem podagraria. Goat Weed, (p.) A foreign weed, troubleeome.and difficult to eradicate.
Cicala maculata Water Hemlock, spotted cowbane, musquash root, (p.) The root of this is puisonoue, and proves ffital to children who collect A nd eat it by mistake for the root of sweet cicely, .rhiaz longiste,tis. It le found indigenous along rivulets and margins of swamps, and should be carefully eradicated.
Coniummaculatem. Common or Poison Hemlock. (b.) A poisonous und dangerous weed, introduced from Europe, aud occasionally met with about old settlements. It is supposed to be the identical herb with which the ancient Greeks put their philosophers and statesmen to death when they got tired of them.