. 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. purple or pink. On plains and prairies. Lake Huron to Assiniboia, Alberta, Kansas, New Mexico and Genus 104. THISTLE FAMILY. 551 7. Cirsium plattense (Rydb.) Thistle. Fig. 4642. Carduus plattcnsis Rydberg, Contr. Nat. Herb. 3 : 2. 1895. Perennial or biennial, the root thick and deep;stem stout, simple, or little branched, i2°-22° tal
. 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. purple or pink. On plains and prairies. Lake Huron to Assiniboia, Alberta, Kansas, New Mexico and Genus 104. THISTLE FAMILY. 551 7. Cirsium plattense (Rydb.) Thistle. Fig. 4642. Carduus plattcnsis Rydberg, Contr. Nat. Herb. 3 : 2. 1895. Perennial or biennial, the root thick and deep;stem stout, simple, or little branched, i2°-22° tall,densely white-felted. Leaves deeply pinnatifid,white-tomentose beneath, green, loosely tomen-tose, or glabrate above, the lower s-Y long, thelobes lanceolate to oblong, acute, prickly tippedand margined; upper leaves smaller and less di-vided ; heads few, about 2 high and broad; outerbracts of the involucre lanceolate to ovate-lanceo-late, firm, dark, tipped with a short weak spread-ing prickle, the inner linear-lanceolate, unarmed,tipped with a scarious reflexed erose appendage;corolla yellow, its lobes linear; pappus of outerflowers merely barbellate. Sand hills, Nebraska, Colorado and South
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
