Bulletin, Issue 4The Survey, 1913 - Geology |
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... occurring in the development of the flower and the formation of the seed . The chapter on the use of weeds in medicine will be of interest to those who occasionally make use of wild plants for medicinal porposes . The chapter on seeds ...
... occurring in the development of the flower and the formation of the seed . The chapter on the use of weeds in medicine will be of interest to those who occasionally make use of wild plants for medicinal porposes . The chapter on seeds ...
Page 14
... occurring in cul- tivated fields being stout and hispid ; but when occurring in moist meadows and old lake beds it has slender and somewhat capillary branches . In Iowa it is quite common in Plymouth , Woodbury , Muscatine , Story ...
... occurring in cul- tivated fields being stout and hispid ; but when occurring in moist meadows and old lake beds it has slender and somewhat capillary branches . In Iowa it is quite common in Plymouth , Woodbury , Muscatine , Story ...
Page 17
... occurs every- where in the state of Iowa , particularly in corn fields , where it comes up abundantly , after the corn is " laid by : " also in gardens and in pastures , especially in the fall . Extermination . It is not generally ...
... occurs every- where in the state of Iowa , particularly in corn fields , where it comes up abundantly , after the corn is " laid by : " also in gardens and in pastures , especially in the fall . Extermination . It is not generally ...
Page 22
... occurring at such points as Marshalltown , Ames , Sioux City and Council Bluffs . It is found in gardens and in the streets . Extermination . - The foxtails are annuals and hence it ought to be an easy matter to destroy them . They ...
... occurring at such points as Marshalltown , Ames , Sioux City and Council Bluffs . It is found in gardens and in the streets . Extermination . - The foxtails are annuals and hence it ought to be an easy matter to destroy them . They ...
Page 32
... occurs also in central Iowa in Story , Boone and Webster counties and is spreading . The grass is of little economic importance . Extermination . This weed is much more difficult to destroy than the other nimble weeds illustrated . The ...
... occurs also in central Iowa in Story , Boone and Webster counties and is spreading . The grass is of little economic importance . Extermination . This weed is much more difficult to destroy than the other nimble weeds illustrated . The ...
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Common terms and phrases
abundant achene aleurone alfalfa annual arvensis bindweed bracts brown brownish Bull calyx Canada thistle canadensis caryopsis Cirsium arvense Clark and Fletcher clover seed cocklebur color common corn corolla cotyledons crop cultivation Curled Dock dandelion Decatur Description.-A Distribution Distribution.-Common dodder Drawing by Charlotte elongated embryo empty glumes endosperm epidermal cells epidermis Europe Extermination FAMILY fields Figure flowering glume foxtail fruit germination glume grain hairs Hillman involucre Iowa King L. H. Pammel lanceolate layer leaf leaves length meadows morning-glory mustard noxious weeds nucellus oblong outer ovate palisade cells pappus parenchyma parenchyma cells pastures perennial pericarp Photographed by Colburn pigment pistil Plantago plantain plants plowing Polygonum protein pubescent quack grass ragweed roadsides roots Rumex scar Shepherd's Purse Smartweed smooth soil species spikelet Spurge stamens stem surface testa thick-walled thin-walled Thistle Cirsium trichomes U. S. Dept walls waste places weed seeds Wild Winton yellow
Popular passages
Page 807 - ... sold, offered or exposed for sale within this State, shall have affixed thereto, in a conspicuous place on the outside thereof, a legible and...
Page 807 - ... or material sampled, the name of the party from whose stock the sample was drawn, and the time and place of...
Page 797 - This act being deemed of immediate importance shall take effect and be in force from and after its publication in the Register and Leader and the Des Moines Capital, newspapers published in Des Moines, Iowa.
Page 807 - ... number of packages which shall not be less than five per cent of the whole lot inspected, and shall be thoroughly mixed and...
Page 704 - US Dept. of Agr.) have apparently become strongly aggressive under changed conditions. These are some of the instances which may show that predominance is not in consequence of change of country and introduction to new soil. In the interesting paper of Claypole the author argues that the abundance of European weeds in North America is because European plants are more plastic than American plants. He says : But a weed possessing a plastic nature — one capable of being...
Page 14 - ... second and third glumes, the latter having sometimes a hyaline palea in its axil; floral glume elliptical, subacute, smooth and shining, a little shorter than the larger outer glumes; anthers saffron yellow.
Page 18 - It is not generally recognized, but it is probably true, that more money is spent in the extermination of foxtails than of any other class of weeds we have in the state of Iowa, yet they are all easily destroyed. One of the best and most effective methods of destroying the foxtail is by plowing the small grain field as soon as the grain is removed. If this is not done a large amount of seed is produced. After this plowing in the fall the field should be disked and harrowed in the spring and then...
Page 622 - Accompanying this maturing of the ovule, various other changes take place which give distinguishing features to different seeds. Frequently the endosperm grows so extensively as to absorb and replace the cells of the nucellus and thus comes to occupy all the space within the coats of the integuments, as in the morning-glory, onion, etc. The embryo may remain comparatively small as in the morning-glory or onion, or it may in turn absorb and replace all the cells of the endosperm and so come to occupy...
Page 399 - ... brought under conditions favorable for germination at intervals for several years. Mature plants should be mowed and burned before plowing. The seed appears as an impurity in clover, millet and the heavier grass seeds, and the plant is doubtless most frequently introduced by this means. As the seeds may be carried a long distance by the wind, the plants must be cleared out of the fence rows, waste land and roadsides.
Page 805 - Russian thistles, wild lettuce or wild mustard are growing on any lands in their township, and are about to spread or mature seed between the first day of June and the fifteenth day of October of each year, said trustees shall cause notice in writing to be served upon the...