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abundant achenes Agriculture Agrl animals annual appearance awns biennial birds blue grass bracts Brassica nigra buffalo bur Bull calyx Canada thistle Canadensis cattle Charlotte Chenopodium album Cicuta maculata clover seed Cnicus cockle common weed corolla cultivated Description.—A Dewey disseminated distribution Division of Bot dodder early eastern Europe exterminated Extermination.—The farmer feet high Figure flowers foxtail fruit germination glume ground growing hairs horse nettle inches long involucre Iowa Kansas lanceolate leaves lettuce loco weeds MARSH ELDER meadows Minnesota Missouri mustard native Nebraska North northern number of seeds occurs Pammel Panicum pappus pastures pepper grasses perennial pods poisonous pollination pollinia Polygonum prickly produced Prof ragweed Rocky mountain root Russian thistle says scattered seed Setaria Setaria viridis sheep Smartweed soil Solanum Carolinense species specimens spread stamens stem sunflower Texas troublesome weed tumble weed U. S. Dept weed seeds western wheat wind Wisconsin writer yellow
Page 400 - Extermination. — One of the most efficient means of destroying this weed is to root it out by the hand and this is done very readily in the spring when the soil is wet by taking hold of the plant just at the surface of the ground, giving the root a slight twist and at the same time an upward pull, when it will readily come from the soil. Where it is common, however, it is sometimes plowed or a spud is used.
Page 423 - Extermination. — The horseradish is one of the most persistent of our weeds; no other weed will stand such rough treatment. It may be hoed and cultivated and still it persists in coming up. Some years ago we tried the following plan : The land was plowed, then harrowed ; the roots were picked up and the process repeated after the lapse of a week, when young plants again made their appearance.
Page 442 - The poison exists principally in the flowers. The young plants appear to be only very slightly dangerous; in the mature ones the amount of poison varies...
Page 426 - ... stem, seeds and leaves. Its true chemical nature is not exactly known but it is highly probable that it contains the alkaloid conine and the bitter principle cicutoxin, the latter of which is characteristic of the European water hemlock (Cicuta virosa). Both are powerful poisons, but the latter is more violent and produces most of the symptoms characteristic of the plant. The American water hemlock is one of the most poisonous plants native to the United States. Its victims include both man and...
Page 422 - Rocky mountains and along the Pacific coast. Everywhere in Iowa in waste places and in cultivated fields. Extermination. — This weed is an annual and is very easily destroyed. Cutting off just below the surface of the ground will exterminate it, provided, of course, that the new seeds are not permitted to re-seed the soil. The weed is common everywhere and the fact that it is so easily blown by the wind makes it difficult to keep it in check.
Page 432 - It i» highly desirable that information may be diffused respecting this and other poisonous and deleterious plants, so that such accidents may be avoided. The root has been to some extent employed by medical men. Its effects are much the same as those of the European hemlock (no way...
Page 348 - Extermination. — The morning-glory must be treated like horse nettle since it is a perennial. In addition to the usual methods of cultivation sheep have been recommended to destroy the weed. This method is certainly applicable where the weed occurs in pastures. In Wallace's Farmer, Mr.
Page 336 - If the rape is sown in drills about two pounds of seed per acre is sufficient quantity and three pounds if sown broadcast. When the crop has attained a rank growth it may be pastured or removed and fed to stock. Where land is lacking in vegetable matter it is good practice to plow the crop under when it is properly manured.
Page 421 - Extermination. — Plants of this species produce an enormous number of seeds. The young plants are easily destroyed by cutting off below the ground. Covering the young plants is not effective unless the entire plant is covered. Older plants may be destroyed by pulling them up. The weed on account of the shade it produces destroys other vegetation underneath it. Chemical Composition. — According to a report of the Bussey Institution, the chemical composition is as follows:* •Bull.
Page 351 - ... long, smooth, reticulated, margined from beak down along placental side with smaller ribs between them ; seeds light brown, 1 line long, minutely pitted, caulicle prominent, running lengthwise with a prominent groove between it and the cotyledons which are incumbent ; on the addition of water seeds become mucilaginous.