. An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian. AMBROSIACEAE. Vol. hi. 6. Xanthium pennsylvanicum Clotbur. Fig. 4137. Xanthium pennsylvanicum Wallr. Beitr. Bot. i :236. 1842. Stem comparative!}^ slender, smooth below,roughish above, i°-3° high. Leaves thin, long-petioled, sharply toothed and some of them3-5-lobed, smoothish, or the upper surfacescabrate, glandular; burs clustered in the long, a
. An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian. AMBROSIACEAE. Vol. hi. 6. Xanthium pennsylvanicum Clotbur. Fig. 4137. Xanthium pennsylvanicum Wallr. Beitr. Bot. i :236. 1842. Stem comparative!}^ slender, smooth below,roughish above, i°-3° high. Leaves thin, long-petioled, sharply toothed and some of them3-5-lobed, smoothish, or the upper surfacescabrate, glandular; burs clustered in the long, about one-third as thick, puberu-lent and resinous-glandular, and commonlywith a few longer hairs; prickles numerous,subulate, hooked, more or less hispid or gla-brate, the longer ones nearlj- as long as thediameter of the bur; beaks slender, but stouterthan the prickles, incurved and hooked. Moist gorunds, Quebec to Minnesota, NewYork, Missouri and Colorado. Re-ferred in our first edition to Xanthium canadenseMill., a name which has been variously applied todiilerent plants by authors. 7. Xanthium commiine Britton. Cockle-btir or Clotbtir. Fig. 4138. Xanthium commune Britton, Manual 912. 1901. Stem rat
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
