. 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. BUBIACEAE {MADDER FAMILY) 399 spatulate, bristle-pointed, the margins and midribs also bristly with short, stiff hairs. Flowers similar to the preceding species in structure, white, minute but very numerous, in open cymose clusters at the ends of the many branches and in the upper axils. The twin fruits are smooth. Means of control Hand-pull the vines when in first bloom. If the patches are not too n
. 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. BUBIACEAE {MADDER FAMILY) 399 spatulate, bristle-pointed, the margins and midribs also bristly with short, stiff hairs. Flowers similar to the preceding species in structure, white, minute but very numerous, in open cymose clusters at the ends of the many branches and in the upper axils. The twin fruits are smooth. Means of control Hand-pull the vines when in first bloom. If the patches are not too numerous, it will pay to grub out the roots and save further trouble. SMOOTH BUTTONWEED Spermacbce gldbra, Michx. Native. Perennial. Propagates by seeds. Time of bloom: June to September. Seed-time: August to October. Range: Ohio to Illinois, southward to Florida, Arkansas, and Texas. Habitat: Wet meadows, banks of streams, and ditches. Stem ten to twenty inches tall, rather stout, smooth, four-sided, sometimes simple and erect or often diffusely branched, the branches spreading, the lower ones decum- bent. Leaves one to three inches long, opposite, their bases connected by bristly, membranous stipules, entire, elliptic, pointed at each end, with smooth surface but rough edges. Flowers in dense terminal and axil- lary whorled clusters, the corollas funnel- form, four-lobed, white, less than a quarter- inch long; stamens four, inserted on the tube; style two-cleft; calyx also four-lobed, its acute teeth persistently crowning the fruit, which is two-celled; when ripe the carpels separate, one carrying with it the partition, leaving the other bare on the inner face. Seeds small, hard, black, oblong to wedge-shaped, rounded on the back, with flat inner face; too often an impurity of southern grass and clover seed. (Fig. 278.). Fig. 278. —Smooth Buttonweed (Sperma- coce glabra). X |.. Please note that these images are extracted from scanned page images that may have been digitally
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1919
