. 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. Perennial by horizontal rootstocks, forming patches,nearly glabrous, or the leaves sometimes woolly be-neath; stems striate, i°-3° high, branched sessile, slightly clasping, but not decurrent,lanceolate or oblong-lanceolate, deeply pinnatifid intovery prickly, lobed or dentate segments, or sometimesnearly or quite entire; basal leaves sometimes peti-oled, 5-8 lon
. 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. Perennial by horizontal rootstocks, forming patches,nearly glabrous, or the leaves sometimes woolly be-neath; stems striate, i°-3° high, branched sessile, slightly clasping, but not decurrent,lanceolate or oblong-lanceolate, deeply pinnatifid intovery prickly, lobed or dentate segments, or sometimesnearly or quite entire; basal leaves sometimes peti-oled, 5-8 long; heads numerous, corymbose, dioe-cious, ibroad or less, nearly i high, purple or white,staminate heads globose, corollas projecting; pistil-late heads oblong-campanulate, corollas shorter, thelong pappus conspicuous ; outer bracts ovate or ovate-lanceolate, appressed, tipped with short prickly points,inner bracts of the pistillate heads linear, elongated. In fields and waste places, Newfoundland to Virginia,British Columbia, Nebraska and Utah. In many placesa pernicious weed. Races differ in leaf-form and inpubescence. Naturalized from Europe. Way- or cursedthistle. Corn-, hard- or prickly-thistle. 554 COMPOSITAE. Vol. hi.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
