. Textbook of pastoral and agricultural botany, for the study of the injurious and useful plants of country and farm. Fig. 109.—Mullein {Verbascum thapsus) in sandy field at Bayville, northern shore ofLong Island, July 9, 1919. An unusually thrifty Fig. iio.—Field of Mullein {Verhascum thapsus) near Lake Mombasha, X. Y., July 30, 1914- 2 54 PASTORAL AND AGRICULTURAL BOTANY 3. Biennials. The plants of this class expend their energy the firstseason in forming a root system and foliage leaves. The second yearflowers are formed and the seeds are matured. The burdock {Arctiumlappa), the swe

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. Textbook of pastoral and agricultural botany, for the study of the injurious and useful plants of country and farm. Fig. 109.—Mullein {Verbascum thapsus) in sandy field at Bayville, northern shore ofLong Island, July 9, 1919. An unusually thrifty Fig. iio.—Field of Mullein {Verhascum thapsus) near Lake Mombasha, X. Y., July 30, 1914- 2 54 PASTORAL AND AGRICULTURAL BOTANY 3. Biennials. The plants of this class expend their energy the firstseason in forming a root system and foliage leaves. The second yearflowers are formed and the seeds are matured. The burdock {Arctiumlappa), the sweet clover {Melilolus alba), the wild carrot {Daucns caroia),the mullein (Figs. 109 and no), and the teasel belong here. 4. The fourth class includes the perennial weeds, which perennalebv means of roots, rootstocks, bulbs, tubers and other organs. A number of our noxious weeds are propagated byrunning, or creeping roots, such as, milkweed (Asdepias cornuti), bindweed

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Keywords: ., book, bookcentury1900, bookdecade1920, booksubjectpoisonousplants