. The Indiana weed book. Weeds. WEEDS OP THE RAGWEED FAMILY. 151. Fig. 111. 1, a staminate flower; .', a fruit. (After State, occurring everywhere in. both cultivated and pasture land, but especially abundant in stubble fields after the crops have been har- vested. July-Oct. The slender ra- cemes of little green staminate flow- ers, like knots or beads along the stem, produce a bounteous crop of yellow pollen which thickly coats the clothing . of whoever passes through a clump of ragweed on an August day. Both it and the great ragweed are known as "hay-fever plants," their po
. The Indiana weed book. Weeds. WEEDS OP THE RAGWEED FAMILY. 151. Fig. 111. 1, a staminate flower; .', a fruit. (After State, occurring everywhere in. both cultivated and pasture land, but especially abundant in stubble fields after the crops have been har- vested. July-Oct. The slender ra- cemes of little green staminate flow- ers, like knots or beads along the stem, produce a bounteous crop of yellow pollen which thickly coats the clothing . of whoever passes through a clump of ragweed on an August day. Both it and the great ragweed are known as "hay-fever plants," their pollen spores when inhaled being popularly supposed to germinate in the nostrils and irri- tate the nasal membranes of persons subject to the disease. The seeds or fruit are common in clover seed and retain their vitality for years when buried in the soil, springing up wherever the land is plowed or after harvest when other plants are absent. Eemedies: mowing or burn- ing over stubble in September; early fall plowing followed by disk harrowing; use of clean seed: late cultivation in hoed crops; sheep grazing when the plants are young. A prairie form, the lance-leaved ragweed (A. bidentata Michx.) oc- curs frequently in the western counties of the State. From the common form it differs in having the sterile heads sessile, not short- stalked, and in the leaves being lance-shaped, sessile, with one or two sharp teeth near the base. 116. Xanthium spinosum L. Spiny Cocklebur. Dagger Cocklebur. Burweed. (A. I. 1.) Stem erect, much branched, 1-3 feet high; leaves lanceolate, pointed, Jk. m. J^f-ff i^fa rftS usually lobed or CUt-toothed, Shining, showing 2 seeds. (After Dewey.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Blatchley, W. S. (Willis Stanley), 1859-1940. Indianapolis, The Nature publishing company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1912
