. Foundations of Botany. Botany. HOW PLANTS ARE SCATTERED 381 are : aquatic grasses, rushes and sedges, polygonums, water-dock, bur-reed, arrowhead, water-plantain, pickerel-weed, alder, button- bush, water-parsnip (Sium), water-hemlock (dciita), water penny- wort (Hydrocotyle). 451. Distances traversed by Floating Seeds. — Ocean currents furnish transportation for the longest journeys that are made by floating seeds. It is a well-known fact that cocoa-palms are among the first plants to spring up on newly formed coral islands. The nuts from which these palms grew may readily have floated a th
. Foundations of Botany. Botany. HOW PLANTS ARE SCATTERED 381 are : aquatic grasses, rushes and sedges, polygonums, water-dock, bur-reed, arrowhead, water-plantain, pickerel-weed, alder, button- bush, water-parsnip (Sium), water-hemlock (dciita), water penny- wort (Hydrocotyle). 451. Distances traversed by Floating Seeds. — Ocean currents furnish transportation for the longest journeys that are made by floating seeds. It is a well-known fact that cocoa-palms are among the first plants to spring up on newly formed coral islands. The nuts from which these palms grew may readily have floated a thousand miles or more without injury. On examining a cocoanut with the fibrous husk at- tached, just as it fell from the tree, it is easy to see how well this fruit is adapted for transportation by water. There are al- together about a hundred drifting fruits known, one (the Maldive nut) reach- ing a weight of twenty to twenty-five pounds. 452. Burs. — A large class of fruits is characterized by the presence of hooks on the outer surface. These are sometimes outgrowths from the ovary, sometimes from. Fig. 270. —Panicle of Tickle-Grass, a Common 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 Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston, Ginn & company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1901
