. 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. Richweed. Wild hemp. Horse-weed. 2. Ambrosia trifida L. Horse-cane. Bitter-weed. Great Ragweed. Fig. 4126. Ambrosia trifida L. Sp. PI. 987. 1753. A. integrifolia Muhl.; Willd. Sp. PI. 4: 375. 1805. Ambrosia trifida integrifolia T. & G. Fl. N. A. 2: 290. 1841. Annual, scabrous or hispid, or nearly glabrous,branched, 3°-i7° high. Leaves all opposite, petioled,3-nerved, deeply 3
. 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. Richweed. Wild hemp. Horse-weed. 2. Ambrosia trifida L. Horse-cane. Bitter-weed. Great Ragweed. Fig. 4126. Ambrosia trifida L. Sp. PI. 987. 1753. A. integrifolia Muhl.; Willd. Sp. PI. 4: 375. 1805. Ambrosia trifida integrifolia T. & G. Fl. N. A. 2: 290. 1841. Annual, scabrous or hispid, or nearly glabrous,branched, 3°-i7° high. Leaves all opposite, petioled,3-nerved, deeply 3-5-lobed, or undivided, the lobeslanceolate or ovate, serrate, acute or acuminate;lower leaves often 1° wide; racemes of sterile heads3-io long, their involucres saucer-shaped, 3-ribbedon the outer side, crenate-margined or truncate, theirreceptacles naked; fertile heads usually clustered inthe axils of the upper bract-like leaves, turbinate toobovoid, 5-7-ribbed, conic-beaked, 3-4 long, eachrib bearing a tubercle near the summit. In moist soil, Quebec to Florida, west to Manitoba,Nebraska, Colorado and New Mexico. Tall Hay-fever weed. July-Oct. 3. Ambrosia elatior L. Ragweed. Roman W
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
