. The Indiana weed book. Weeds. 152 THE INDiANA WEED BOOK. dark green, whitish woolly beneath; axils each with a short-stalked, 3- pronged, yellow spine nearly 1 inch long. Bur oblong-cylindric, £ inch long, hairy and with 1 or 2 short, awl-shaped beaks and numerous short hooked spines. (Fig. 112.) This cocklebur has invaded Indiana from, the south, where it is very troublesome, and is- recorded from a number of the southern counties. It is one of the most spiny of the American weeds, and the hooked spines on its burs provide for wide distribu- tion by every-passing animal. It is a n
. The Indiana weed book. Weeds. 152 THE INDiANA WEED BOOK. dark green, whitish woolly beneath; axils each with a short-stalked, 3- pronged, yellow spine nearly 1 inch long. Bur oblong-cylindric, £ inch long, hairy and with 1 or 2 short, awl-shaped beaks and numerous short hooked spines. (Fig. 112.) This cocklebur has invaded Indiana from, the south, where it is very troublesome, and is- recorded from a number of the southern counties. It is one of the most spiny of the American weeds, and the hooked spines on its burs provide for wide distribu- tion by every-passing animal. It is a native of tropical America and, unlike the other cockleburs, occurs mostly in grass-land, as pastures, meadows, and along roadsides, spreading even in strong sod. The two seeds in the thick-walled bur retain their vitality for yedrs and care should be taken to destroy the first plants which appear before the burs mature. Remedies: mowing several times in late summer; deep cutting with hoe or spud in May and June; thorough cultivation for two or three successive seasons. 117. Xanthium giabratum DC. Common Cocklebur. Glotbur. (A. N. 1.) Erect, rough, branching, 1-6 feet high; leaves heart-shaped or ovate, long-stalked, the lower often 8 inches wide, margins toothed or lobed; axils without spines. Burs oblong, nearly glabrous, J inch long, with 2 straight 2-toothed beaks and numerous smooth hooked spines. (Figs. 1', o; 113.) Abundant everywhere in rich cultivated soils, barnyards, waste places and along roadsides. One of the worst of corn-field weeds in river bottoms, and in pastures especially annoying in wool and the manes of horses. The burs with their two en- closed seeds are widely distributed over lowlands by annual overflows, and on the uplands by animals to which they closely adhere. It is said that only one of the 2 seeds will germinate the first season, the other lying dormant for a year. Another species, the American cocklebur or hedgehog burweed (X. canadense
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1912
