. 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. Genus 2. RAGWEED FAMILY I. Ambrosia bidentata Alichx. Lance-leaved Ragweed. Fig. 4125. Ambrosia bidentata Michx. Fl. Bor. Am. 2 : 182. 1803. Annual, hirsute, usually much branched, very-leafy, i°-3° high. Leaves lanceolate, mainlyalternate, sessile and somewhat cordate-claspingat the base, acuminate at the apex, i-nerved, i-3long, 2-4 wide, usually with i or 2 sharp lobesat t
. 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. Genus 2. RAGWEED FAMILY I. Ambrosia bidentata Alichx. Lance-leaved Ragweed. Fig. 4125. Ambrosia bidentata Michx. Fl. Bor. Am. 2 : 182. 1803. Annual, hirsute, usually much branched, very-leafy, i°-3° high. Leaves lanceolate, mainlyalternate, sessile and somewhat cordate-claspingat the base, acuminate at the apex, i-nerved, i-3long, 2-4 wide, usually with i or 2 sharp lobesat the base and a few minute sharp teeth above,or the upper ones quite entire, rough and hirsuteor ciliate; spikes of staminate heads dense, 2)-7long, their involucres turbinate, bearing a longlanceolate hispid reflexed lobe appearing like abract on the inner border, their receptacles chaffy ;fertile heads ^ solitary, or clustered, oblong,4-angled, 2>-4 long, bearing 4 sharp spines. Prairies, Illinois to Missouri, Kansas, Louisianaand Texas.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
