. 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. Ast. 183. 1832. 160. & G. Fl. N. A. 2:Bull. Torr. Club 37: Ontario to Saskatchewan, A. ptarmicoides T. alba Rydb. 146. 1910. Stems tufted, slender, rigid, usuallyrough above, corymbosely branched nearthe summit, i°-2° high. Leaves linear-lanceolate, 1-3-ribbed, entire, or with afew distant teeth, firm, shining, rough-margined or ciliate, sometimes scabrous,acute,
. 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. Ast. 183. 1832. 160. & G. Fl. N. A. 2:Bull. Torr. Club 37: Ontario to Saskatchewan, A. ptarmicoides T. alba Rydb. 146. 1910. Stems tufted, slender, rigid, usuallyrough above, corymbosely branched nearthe summit, i°-2° high. Leaves linear-lanceolate, 1-3-ribbed, entire, or with afew distant teeth, firm, shining, rough-margined or ciliate, sometimes scabrous,acute, narrowed to a sessile base, or thelower petioled, the lowest and basal ones3-6 long, 2-4 wide, the upper smaller,those of the branches linear-subulate;heads 8-i2 broad; involucre nearlyhemispheric, 2-3 high, its bracts lin-ear-oblong, obtuse, or the outer acutish,appressed. nearly glabrous, green, im-bricated in about 4 series; rays 10-20,white. 3-4 long; pappus white; achenesglabrous. In dry or rock-y soil, Massachusetts, Ver-Illinois, Missouri and Colorado. July-Sept. Genus 31. THISTLE FAMILY. 433.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
