Questo testo discute la dispersione di semi e frutti trasportati dall'acqua. Piante come Great Ragweed, Smartweeds e pioppi si affidano ai corsi d'acqua per diffondere i loro semi. Durante le inondazioni, i semi vengono trasportati a valle, spesso si stabilizzano in nuove posizioni per una crescita futura. Gli esempi includono tumbleweed, i cui semi si diffondono man mano che la pianta si muove con il vento.
1881 x 1328 px | 31,9 x 22,5 cm | 12,5 x 8,9 inches | 150dpi
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. Botany for agricultural students . Botany. 84 SEEDS AND FRUITS Seeds and Fruits Carried by Water. — Plants, such as the Great Ragweed, Smartweeds, Bindweeds, Willows, Poplars, and Walnuts, which grow along stream3, have their seeds and fruits floated away during overflows. Sometimes, when the banks of. Fig. 86. — Plants of the tumble weed {Amaranlhus albus) tumbling over the ground and scattering seeds as they go. After Bergen. streams cave off, plants with ripened seeds fall into the current bodily and are carried for miles down the stream, finally lodging in fields where their seeds grow. The seeds of plants growing on the upland are washed to the lowlands during rains and seed the bottom fields. Some fruits, as in case of the Coconut, are so resistant to salt water that they can be carried long distances by ocean currents. Seeds and Fruits Carried by Animals. — Birds eat the fruits of some plants for the outer pulp, and the hard seeds pass undi- gested. In this way the seeds of the Nightshades, Poison Ivy, Pokeweed, Blackberry, Pepper Grass, and others are distributed. Even the seeds and fruits of Thistles, Dandelion, Ragweeds, and Knotgrass may be eaten in such large quantities that many pass undigested and start new plants wherever they fall. Birds often carry sprigs of plants to places where the seeds may be eaten without molestation and in this way distribute seeds. {Fig. 87.) Birds that wade in the edge of ponds, lakes, and streams often carry away on their feet and legs mud containing seeds.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Martin, John N. (John Nathan), b. 1875. New York : John Wiley & Sons, Inc.
