. The Indiana weed book. Weeds. 72 THE INDIANA WEED BOOK. Seeds light yellow, conical, about the size of clover seed and usually covered with a gray coating. (Fig. 39.) Occurs sparingly in the north- ern third of the. State; there in- troduced by the trunk-line rail- ways from the northwest, where it is a very troublesome weed in prairie grain fields. July-Sept. It is a tumble-weed, not a thistle, and wnen full grown becomes very large and spreading, form- ing from 2 to 6 feet in dia- meter. When broken off it is rolled over and over by the wind, scattering far and wide its many seeds. R
. The Indiana weed book. Weeds. 72 THE INDIANA WEED BOOK. Seeds light yellow, conical, about the size of clover seed and usually covered with a gray coating. (Fig. 39.) Occurs sparingly in the north- ern third of the. State; there in- troduced by the trunk-line rail- ways from the northwest, where it is a very troublesome weed in prairie grain fields. July-Sept. It is a tumble-weed, not a thistle, and wnen full grown becomes very large and spreading, form- ing from 2 to 6 feet in dia- meter. When broken off it is rolled over and over by the wind, scattering far and wide its many seeds. Remedies: pulling, spud- ding or uprooting before seeding; cultivating hoed crops until Au- gust; burning wheat stubble and other areas where it grows; sow- ing forage crops and pasturing with sheep. Farmers living along railways should keep an especial lookout for the Russian thistle and should destroy at once every strange weed which bears any resemblance to the description given. It is estimated that a single specimen produces from 20,000 to 30,- 000 seeds, so that if only one matures its seeds the farmers for miles around will suffer in a year or Fig. 39. a, branch of the mature plant; 6, seed- ling; c, flower; d, flower viewed from above and in front; e, seed; /, embryo' removed from the seed. (After Dewey.) The Amaranth , Homely herbs with alternate or opposite simple leaves. Flow- ers- small, green or white, variously clustered, usually in terminal spikes or axillary heads and differing from those of the preceding family in being surrounded by thin dry and membranous per- sistent bracts which are often colored; petals none; calyx 2-5 parted, the parts usually distinct; stamens 1-5, mostly opposite the calyx lobes; ovary 1-celled. Fruit a utricle of which the cap comes away as a lid or bursts irregularly. (Fig. 14, e.) Only 11 species of the family are known from the State, all of which are weeds of high or low degree. The showy coxcombs, prince'
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1912
