. Botany for high schools. Botany. SEED DISPERSAL 203 akenes of the same genus are called Spanish ; The oval fruit of the cockle-bur " is covered with long hooks. In the burdock " the numerous bracts, surrounding the head containing the numerous akenes, are extended into a long slender process terminating in a hook. The sticktights," or tick trefoil," are sections of the pod of a leguminous plant {Des~ modium = Meihomia) which are covered with numerous hooks. In the various species of avens {Geiim) the long style of the akene is jointed near the end and cur\'ed
. Botany for high schools. Botany. SEED DISPERSAL 203 akenes of the same genus are called Spanish ; The oval fruit of the cockle-bur " is covered with long hooks. In the burdock " the numerous bracts, surrounding the head containing the numerous akenes, are extended into a long slender process terminating in a hook. The sticktights," or tick trefoil," are sections of the pod of a leguminous plant {Des~ modium = Meihomia) which are covered with numerous hooks. In the various species of avens {Geiim) the long style of the akene is jointed near the end and cur\'ed into a hook. It separates at the joint, leaving the hook on the long beak (fig. 167). Besides the seeds provided with grapplers many seeds ad- here with mud to the feet of animals, and in the case of birds are often trans- ported to great distances, especially by wading birds and waterfowl. 340. Dispersal of seeds by water.—Streams have long been recognized as lines for the transport and centers of distribution of seeds. Some seeds because of their light weight and slightly impervious coats float for long distances on the water. Others which may sink are swept along in the strong current. Even on high ground, ^,g^^. many seeds are carried to Fruits of tick trefoil (Desmodium). considerable distances by the run-off " water during heavy rains. Seeds are distributed also along the shores of ponds and lakes as they float on the water which is moved by winds. Also along the shores of the ocean the. 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 Atkinson, George Francis, 1854-1918. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
