. Textbook of botany. Botany. Fig. I burdock. Weed. black-eyed Susan. The wild carrot and the wild parsnip, both members of the parsley family, are biennials; and so are the mulleins, the blueweed, the hound's tongue, and the wild teasel. 351. Perennial Weeds. — The weeds of this group multiply by means of seeds, but the fact that parts of them live from year to year makes it possible for them to in- crease their numbers in other ways as well. Many of them, such as the Canada thistle and the horse-radish, spread very readily by means of the growth and branching of their underground parts. Inde
. Textbook of botany. Botany. Fig. I burdock. Weed. black-eyed Susan. The wild carrot and the wild parsnip, both members of the parsley family, are biennials; and so are the mulleins, the blueweed, the hound's tongue, and the wild teasel. 351. Perennial Weeds. — The weeds of this group multiply by means of seeds, but the fact that parts of them live from year to year makes it possible for them to in- crease their numbers in other ways as well. Many of them, such as the Canada thistle and the horse-radish, spread very readily by means of the growth and branching of their underground parts. Indeed, the horse-radish in the United States depends almost entirely upon this vegetative method of propa- gation and forms seeds but rarely. The composite family, to which so many annual and biennial weeds belong, contributes also a goodly number of perennial weeds; the list includes the Canada thistle, the field sow thistle, the ironweed, the dandelion, and the marguerite or ox- eye daisy. Among the grasses that cause trouble as weeds are the well- known quack grass, the Johnson grass, and Ber- muda grass. Other peren- nial weeds are the bind- weeds, horse nettle, milkweeds, plantains, field garlic, Indian hemp, field sorrel, and yellow dock. The brake is one of Fig. 185.—The Canada thistle. After Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Allen, Charles E. (Charles Elmer), b. 1872; Gilbert, Edward Martinius, joint author. Boston, New York [etc. ] D. C. Heath & co
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