. Foundations of botany. Fig. 270. —Panicle of Tickle-Grass, aCommon Tumble weed. 382 FOUNDATIONS OF BOTANY the calyx, sometimes from an involucre. Their office isto attach the fruit to the hair or fur of passing , as in sticktights (Fig. 272), the hooks are comparartively weak, but in other cases, as in the cocklebur (), and still more in the Martynia, the fruit of whichin the green condition is much used for pickles, thehooks are exceedingly strong. Cockleburs can hardly beremoved from the tails of horses and cattle, into which. I II III Fig. 271. — Three Fruits adapted f
. Foundations of botany. Fig. 270. —Panicle of Tickle-Grass, aCommon Tumble weed. 382 FOUNDATIONS OF BOTANY the calyx, sometimes from an involucre. Their office isto attach the fruit to the hair or fur of passing , as in sticktights (Fig. 272), the hooks are comparartively weak, but in other cases, as in the cocklebur (), and still more in the Martynia, the fruit of whichin the green condition is much used for pickles, thehooks are exceedingly strong. Cockleburs can hardly beremoved from the tails of horses and cattle, into which. I II III Fig. 271. — Three Fruits adapted for Dispersal by the Shaking Action of the , celandine ; II, pea; III, jimson weed {Datura). they have become matted, withoui; cutting out all thehairs to which they are fastened. A curious case of distribution of this kind occurredin the island of Ternate, in the Malay Archipelago. Abuffalo with his hair stuck full of the needle-like fruits ofa grass ^ was sent as a present to the so-called King ofTernate. Scattered from the hair of this single animal,the grass soon spread over the whole island. 1 Andropogon adcularis. HOW PLANTS AliE SCATTERED 38B Why do bur-bearing plants often carry their fruit untillate winter or early spring? What reason can be given for the fact that the burdock,the cocklebur, the beggars-ticks, the hounds-tongue, andmany other common burs, are among the most persistentof weeds ? 453. Uses of Stone Fruits and of Fleshy Fruits to thePlant. — Besides the dry fruits, of which some of theprincipal kinds have been
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