. 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. es crenate-dentate, or somewhat lyrate ; perennials. Stem glabrous, or pubescent or puberulent above; rootstock hirsute or villous. Stem leaves auricled, clasping at base ; rootstock leaves sessile, not auricled ; rootstock long, slender. I. Parthenium Hysterophorus L. Santa 4432. P. Hysterophorus L. Sp. PI. 988, 1753. Annual, str
. 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. es crenate-dentate, or somewhat lyrate ; perennials. Stem glabrous, or pubescent or puberulent above; rootstock hirsute or villous. Stem leaves auricled, clasping at base ; rootstock leaves sessile, not auricled ; rootstock long, slender. I. Parthenium Hysterophorus L. Santa 4432. P. Hysterophorus L. Sp. PI. 988, 1753. Annual, strigose-pubescent or somewhat villous, usu-ally much branched, i°-2l° high. Leaves ovate to ob-long in outline, 1-2-pinnately parted into linear or lan-ceolate toothed or pinnatifid segments, thin and flaccid;heads numerous, 2Y-2> broad; involucre saucer-shaped,its bracts concave, the outer ones rhombic, the innerbroader; ray-flowers few; rays reniform, white, about¥ wide; achenes obovate, about ¥ long. Waste and cultivated grounds, southern Pennsylvania toIllinois, Missouri, Florida and Texas. Throughout tropicalAmerica. July-Sept. 1. P. Hysterophorus. 2. P. integrifolium. 3. P. auriculatnm. 4. P.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
