Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . pol-len, abundantly shed from the staminateblossoms, falls directly upon the exposedovules. Afterwards the scales close overeach other until the seeds are ripe. In theYew there is no carpel or pistil-leaf at all;but the fertile blossom consists of a solitarynaked ovule, borne on the extremity of a 515 516 FIG. 511. Scale, i. e. open pistil, from the cone of a Larch, at the time of flowering, or alittle later; the upper
Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . pol-len, abundantly shed from the staminateblossoms, falls directly upon the exposedovules. Afterwards the scales close overeach other until the seeds are ripe. In theYew there is no carpel or pistil-leaf at all;but the fertile blossom consists of a solitarynaked ovule, borne on the extremity of a 515 516 FIG. 511. Scale, i. e. open pistil, from the cone of a Larch, at the time of flowering, or alittle later; the upper side seen, with its pair of naked ovules. FIG. 512. Similar view of a Larch scale, when the seeds are partly grown. 513. A maturescale, one of the seeds in its place, the other fallen (reduced in size). 514. A seed detached,with its wing. FIG. 515. Branchlet of the American Arbor-Vitas, considerably larger than in nature, ter-minated by its pistillate flowers, each consisting of a single scale (an open pistil), togetherforming a small cone. 51G. One of the scales or pistils removed and more enlarged, the insideexposed to view, showing a pair of naked ovules ou its THE OVULE. 297 short branch, and surrounded by a few small bracts. As the ovulesare here naked and exposed to the direct contact of the pollen, andthe seeds are not enclosed in anything answering to a pod, thesehave received the name of Gymnospermous Plants, that is, plantswith naked seeds. Sect. VIII. The Ovule. 561. Ovules (420, 543) are bodies borne by the pistil, which, onbeing fertilized and having an embryo developed in them, becomeseeds. To their formation, fertilization, and protection all the otherparts of the blossom are subservient. They vary greatly in num-ber, from one (solitary) in each carpel or cell to a multitude. Whenfew and uniform in number, they are said to be definite ; when toonumerous to be readily counted, indefinite. 562. As to situation and direction, they are erect when they arisefro
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Keywords: ., bookauthorgra, bookcentury1800, bookdecade1860, booksubjectbotany
