. 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. CRUCIFERAE {MUSTARD FAMILY) 179 Means of control Infested grain fields and meadows should be sprayed with Iron sulfate or Copper sulfate before the first flowers mature. Stubbles should be cultivated after harvest in order .to destroy autumn seedlings. SWINE CRESS Cordnopus didymus, Sm., (Senebiera didyma, Pers.) Other English names: Lesser Wart Cress, Carpet Cress. Introduced. Annual or biennial. Pr
. 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. CRUCIFERAE {MUSTARD FAMILY) 179 Means of control Infested grain fields and meadows should be sprayed with Iron sulfate or Copper sulfate before the first flowers mature. Stubbles should be cultivated after harvest in order .to destroy autumn seedlings. SWINE CRESS Cordnopus didymus, Sm., (Senebiera didyma, Pers.) Other English names: Lesser Wart Cress, Carpet Cress. Introduced. Annual or biennial. Propagates by seeds. Time of bloom: March to June. Seed-time: Early May to August. Range: Newfoundland to Florida and Texas, westward to Cali- fornia. Habitat: Yards, roadsides, waste places. Grazing cattle usually avoid plants with a disagreeable odor, but they seem to make an exception of the Mustards. The smell of this weed is suggestive of a pigsty, whence its name of Swine Cress; it is occasionally the cause of damaged dairy products. (Fig. 123.) Stems four inches to a foot in length, prostrate, diffusely branched, hairy, spreading on all sides from the root. Leaves very deeply pin- natifid, some but once, others with the segments also cut; upper ones sessile but those near the base having slender petioles. Flowers white, ex- tremely small, in slender axillary racemes on short, threadlike pedicels. Autumn plants flower earliest, com- ing into bloom as soon as uncovered from winter snows. Silicles small, valves separating readily into two taining one FlQ. 123. — Swine Cress (Corono- pus didymus). X i- wrinkled, warty, the two ovoid nutlets, each con-. 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 Georgia, Ada Eljiva, 1859-1921. New York : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1919
