. Weeds and weed seeds illustrated and described [microform]. Weeds; Mauvaises herbes; Mauvaises herbes; Weeds. 38 WEEDS AND WKED -<EEDS. Red-root Pigweed (Aiudmuthus retroflcxtm L.) is ;iii annual intnxliici'il from tropical Amorica and now cstahlislicd in all scttkMl parts of the Dominion. It has a rosy pink tap-root. Stems erect, simple or branched, rough-hairy. Leaves on long stalks, ovate, hristle-pointed. Flowers inconspicuous, numerous, crowded into thick compound and etiually convex on both sides. An immature or shrunken se(>d has a narrow, slightly flattened marginal l)and, whic
. Weeds and weed seeds illustrated and described [microform]. Weeds; Mauvaises herbes; Mauvaises herbes; Weeds. 38 WEEDS AND WKED -<EEDS. Red-root Pigweed (Aiudmuthus retroflcxtm L.) is ;iii annual intnxliici'il from tropical Amorica and now cstahlislicd in all scttkMl parts of the Dominion. It has a rosy pink tap-root. Stems erect, simple or branched, rough-hairy. Leaves on long stalks, ovate, hristle-pointed. Flowers inconspicuous, numerous, crowded into thick compound and etiually convex on both sides. An immature or shrunken se(>d has a narrow, slightly flattened marginal l)and, which marks the location of the ring-like germ, i'igweed s{>eds are (piite commonly found in clover an<l grass seeds, es- pecially alsike and timothy. Hed- root is especially troublesome in ganlens and in potato and field root crops. Kritdiraliim.—When enibedded in the soil, the see<ls retain their vitality for several years and produce seedling plants only when brought within about two inches of the surface by cultivation. Late cultivation of hoed crops should lie made as siiallow as '• Tumble Weed iAmnninthu'! (irafcnans .\ large bushy annual forming under favourable conditions a compact mass from one to two feet in diameter. Leaves small oval, narrower at base. Flowers tvery small, borne in clusters in the axils of ^ the leaves. When ripe the plants break otT •It their base anil, taking adv;intage of each wind, travel long distances, scattering their -reds as they go. Seeds black, very shiny, clo-ely resembl'' Hed-root but smaller and roumler in outline, 'i'hey are often in western timothy and among the -(>eds of other fodder Thi-i weed occur- chielly on newly broken land in the I'rairie Provinces where it i- often abti'idant and a factor of no small im- portance in robbing the soil of moisture. It i-. however, seldom injurioii-^ on olil well-tilled -oil. 1^, ,v:' >v Kniiliailiiiii. ilarly di-cing of breaking. Nunnier-fallow follo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1914
