. A manual of weeds : with descriptions of all the most pernicious and troublesome plants in the United States and Canada, their habits of growth and distribution, with methods of control . Weeds. 460 COMPOSITAE (COMPOSITE FAMILY) SPINY CLOTBUR Xdnthium spindsum, L. Other English names: Spiny eocklebur, Thorny Burweed, Dagger- weed, Dagger CocHebur, Bathurst Bur. Introduced. Annual. Propagates by seeds. Time of bloom: July to September. Seed-time: September to November. Range: Ontario to Florida, westward to Illinois, Missouri, and Texas. Also abundant on the Pacific Coast. Habitat: Warm, mois
. A manual of weeds : with descriptions of all the most pernicious and troublesome plants in the United States and Canada, their habits of growth and distribution, with methods of control . Weeds. 460 COMPOSITAE (COMPOSITE FAMILY) SPINY CLOTBUR Xdnthium spindsum, L. Other English names: Spiny eocklebur, Thorny Burweed, Dagger- weed, Dagger CocHebur, Bathurst Bur. Introduced. Annual. Propagates by seeds. Time of bloom: July to September. Seed-time: September to November. Range: Ontario to Florida, westward to Illinois, Missouri, and Texas. Also abundant on the Pacific Coast. Habitat: Warm, moist soil; invades almost any crop. A very pernicious weed which came to us from tropical America. It is sometimes cultivated for the odd appearance of its white-veined, white-lined, dark green leaves, yellow spines, and green burs. But these last, with their hooked spines, are so easily transported on clothing and by animals that the plant should be considered an undesirable resident of any neighborhood, particularly as the fruits retain then- vitality for years, biding the time when some stirring of the soil shall furnish them the needed warmth and moisture for germination. It is a worse weed than the other Cockleburs, for it spreads as freely in sod lands as elsewhere. (Fig. 321.) Stem one to three feet tall, many- branched and hoary with whitish hairs. Leaves alternate, .two to five inches long, lance-shaped, long-pointed, and narrow- ing to short petioles, the lower ones lobed and the upper ones entire, white-woolly Spmy Glot- underneath and on midribs and veins above. Just below each leaf is a slen- der, yellow, three-pronged spine about an Flowers of two kinds, the staminate ones in short terminal spikes, the heads very small and greenish, like the Ragweed. Fertile flowers in the axils below, consisting of a. Fie. 321 bur (Xanthium spinosum) inch Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1919
