. Die Indiana weed Buch. Unkraut. Eisenbahnen als Träger OP UNKRAUTSAMEN. 9 cilage, die zu jedem Objekt zu halten. Live Stock von einem Betrieb oder einem Ort zu einem anderen zu tragen oft viele diese Samen oder Burs in Wolle, Mähne oder Schweif, und viele Eine saubere Farm hat aus diesem Grund plötzlich erzeugten Kulturpflanzen der Unkräuter, deren Herkunft zweifellos verwirrt und bestürzt über den Besitzer. Die Teile von Samen oder Früchte, die als umklammern Organe entwickelt worden sind, sind daher in der Form &Amp variiert werden; nd Struktur, aber jeder hat die Anlage, zu der es gehört, wieder und wieder auf ein neues zu Hause zu migrieren aktiviert

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. The Indiana weed book. Weeds. RAILWAYS AS CARRIERS OP WEED SEEDS. 9 cilage which causes them to adhere to every passing object. Live stock taken from one farm or one locality to another often carry many of_ these seeds or burs in wool, manes or tails, and many a clean farm has from this cause suddenly produced crops of weeds whose origin doubtless puzzled and dismayed the owner. The parts of seeds or fruits which have been evolved as clasping organs are thus seen to be varied in form &nd structure, but each has enabled the plant to which it belongs to migrate time and again to a new home where it could the better tight the battle of life. Man as an agent of seed distribution.—The plants which have become the most successful weeds of the farm have had their seeds spread more widely through the agency of man than through all other methods combined. His roads and trails wind everywhere. Fig. 1. HLstrating methods of Heed distribution: a, seeds (achenes) of dandelion with pappup attached, several of them still borne on the receptacle: h, fruit of beggar-ticks showing the barbed awns; c and d, burs or fruits of cocklebur and burdock, showing the grappling appendages; e, fruit of wild carrot, showing the clutching spines; /, winged fruit of wafer-ash. (After Kerner and Beal.) through plain and forest; his railway lines bind every State to- gether and connect with steamship lines from across the seas, and along all these avenues of commerce weed seeds are constantly travelling, sometimes as paid passengers in company with grain and other farm seeds, but more often as hoboes in hay, bedding, packing, shipments of fruit, etc. The great east and west trunk lines of railways are responsible for the wide distribution of many a weed, such as the Russian thistle, prickly lettuce, Canada thistle and Texas nettle, which first appear in any locality along a railway. The seeds are carried either in the coats of cattle or sheep, in the hay which supports them on their journey,

Stockbilder mithilfe von Tags suchen

• bookcentury1900
• bookdecade1910
• bookyear1912
• bücherubjektgewächse