No. 3. Agricultural Botany. 70 



genus known here. It is much cultivated in new and hilly grounds, though consi< 

 dered a severe crop on good soils. 



87. AGRosTEiMMA GiTHAGo, L. Cocklc. A troublcsome pest among wheat. 



88. Phytolacca Decandra, L. Pokeberry Bush. A well-known, coarse weed ; frequent 



in rich soils and new grounds. 



89. Crataegus Crus Galli, L. Cockspur, or New-Castle Thorn. ) Both these spe- 



90. C Cordata, Ait. Washington Thorn: Virginia Thorn. \ cies of Cra- 



tcegus are employed in hedging — the latter to a considerable extent in this county, 

 though the former is probably the better for that object. 



91. PoTENTiLLA CANADENSIS, L. CinquefoH. A worthless little weed ; common in poor, 



old neglected fields. 



92. RuBus OcciDENTALis, L. Rusfberry. ^ These three species of Briar, though yield- 



93. R ViLLosus, Ait. Blackberry. > ing pleasant fruit, are rather troublesome 



94. R Triviai.is, Mx. Dewberry. ) intruders in our fields and pastures. 



95. Rosa Carolina, L. Swamp Rose. Annoying weeds, in low grounds. 



96. PoRTULACA Oleracea, L. Purslane. A common weed, in gardens and corn-fields. 



97. Papaver Dueium, L. Field Poppy. An introduced weed ; becoming a nuisance on 



some farms. 



98. Hypericum Perforatum, L. St. John' s-wort. A pernicious and troublesome weed ; 



common in pastures. 



99. Ranunculus BuLBOsus, L. Butter-cup: Crow-foot. Worthless; and becoming a 



nuisance in some meadows. 



100. Nepeta Cataria, L. Catmint. A common weed, in waste grounds. 



101. N Glechoma, Benth. Alehonf: Ground Ivy. A frequent weed about gardens, 



lots, and along fences. 



102. Lamium Amplexicaule, Z(. Dead Nettle: Hen Bit. A common weed, in gardens 



and cultivated lots. 



103. Leonurus Cardiaca, L. Motherwort. A troublesome pest about gardens, houses, 



and in waste grounds. 



104. Linaria Vulgaris, Mcench. Toad-flax: Ransted Weed. A vile nuisance in our 



pastures and along fence-rows. 



105. Verbena UrticjEfolia, L. Vervain. A worthless weed, in our pastures. 



106. Camelina Sativa, Crantz. Wild Flax. A weed; frequent among flax, and other 



cultivated crops. 



107. Capsella Bursa Pastoris, Mcench. Shepherd's Purse. A troublcsome weed, in 



cultivated grounds and pastures. 



108. Lepidium Virginicum, Z(. Wild Pepper Grass. A worthless weed; the reddish- 



brown seeds often occur among Timothy seed. 



109. Sisymbrium Officinale, iScop. Hedge Mustard. A common weed, in waste grounds, 



lanes, and borders of fields. 



110. Brassica Campestkis, L. Turnip-rooted Cabbage. A variety of this, called Ruta 



Baga, or Swedish Turnip, is sometimes cultivated for stock. 



111. B Rapa, L. Common Turnip. Generally cultivated. The B. Oleracea, or 



common Cabbage, in its numerous varieties — and the sub-species, called Cauliflower, 

 and Broccoli — are also much cultivated ; but the culture is chiefly confined to gar- 

 dens. 



112. Malva Rotundifolia, L. Running Mallows. Common weeds, about gardens, houses, 



and cultivated lots. 



113. SiDA Abutilon, L. Indian Mallow. A troublesome weed, in cultivated lots and 



waste grounds. 



114. Medicago Sativa, L. Lucerne. A valuable plant for pasture and hay in some re- 



gions, but very little cultivated in Chester county. 



115. Trifolium Arvense, L. Stone Clover: Welsh Clover: Rabbit-foot: Hare's-foot 



Trefoil. A worthless species ; often abundant in poor old fields. 



116. T Pratense, L. Red Clover. Highly valuable, and generally cultivated. 



117. T Repens, i/. White Clover: Dutch Clover. Common in our fields, and 



much esteemed as a pasture, though rarely cultivated. 



118. Arctium Lappa, L. Burdock. A well-known nuisance, in waste grounds, &c. 



119. Carduus Lanceolatus, L. Common Thistle, A common pest on good land. 



120. C Arvensis, Smith. Canada Thistle. The vilest nuisance which has yet in- 



vaded our farms. Though not common, it has got possession in several localities, 

 and will be found exceedingly difficult to eradicate. There are three or four other 

 species among us, but not so troublesome as these. 



