. Die Indiana weed Buch. Unkraut. Unkraut OP das THISTLE FAMILIE. 167 stachelige Punkte, inneren Deckblätter mehr, linear; Blumen lila, rosa oder weiß. Achenes Hellbraun, glatt, J Zoll lang, gespitzt, umgeben vom weitläufigen weißen Pappus. (Abb. 120.) häufig in dichte Flecken im Norden von Indiana in Wäldern und anderen Weiden, alte Felder und Abfälle stellen, und entlang der Straßenränder; knapp oder in den südlichen Ländern Beziehungen wollen. June-Oct. Das Thistle hat den Ruf, eine der schlimmsten Geißeln, Unkraut Europa Fell hat gewonnen - uns nished, aber in Indiana ist weniger Mühe - einige als der gemeinsame Thistle oder Fox-t

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. The Indiana weed book. Weeds. WEEDS OP THE THISTLE FAMILY. 167 prickly points, inner bracts longer, linear; flowers purple, pinkish or white. Achenes light brown, smooth, J Inch long, tipped by a copious white pappus. (Fig. 120.) Frequent in dense patches in northern Indiana in woodland and other pastures, old fields and waste places, and along roadsides; scarce or wanting in the southern coun- ties. June-Oct. This thistle has gained the reputation of being one of the worst of weed scourges which Europe has fur- nished us, but in Indiana is less trouble- some than the common thistle or fox-tail. Many other weeds, especially the teasel, tall thistle and bull nettle are mistaken for it. Usually it is first introduced into a new locality by the seeds, and then spreads rapidly wherever it can find a foothold. From other thistles it is best known by its deep running perennial rootstocks. more slender stems and small compact heads. (See Fig. , 13, b.) From the rootstocks, which lie usually far below the ordinary depth of the fur- rows, branches are being continually sent to the surface, oftentimes through 3 feet and more of hard packed soil. These branches produce basal leaves the first year and flowering stems the second; these stems, like those of other thistles, appearing to die after their seeds ripen, but only dying down to the tinder- ground stem. "Wherever it occurs the numerous branches and root- leaves soon cover the ground, smothering out the grass and pre- venting stock from grazing near them on account of their many prickles. Like other perennial herbs it can only be destroyed by starving out or otherwise killing the underground stems. Rem- edies : mowing or deep hoe-cutting three times each season, in June, August and September, then salting or applying coal-oil or sulphuric acid; repeated salting and sheep grazing for 2 years. In fields.cut the thistles when in full bloom as close to the ground as possible, then plow deeply and sow to millet or Hungari

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• bookcentury1900
• bookdecade1910
• bookyear1912
• bücherubjektgewächse