Plant-life, with 74 full-page illus., 24 being from photos, by the author and 50 in colour from drawings . These devicesexist for the allurement of insects, which, in taking thebait and satisfying their lust for sweet things, becomeunconscious pollinating agents. This relationship be-tween insects and a vast number of flowers has un-doubtedly led to great variety of floral structure. Inthe Angiosperms fertilization affects the carpels formingthe pistil; they develop into the fruit. The effectsmay also extend beyond the carpels to the calyx, oreven to the floral receptacle, as in the case of th
Plant-life, with 74 full-page illus., 24 being from photos, by the author and 50 in colour from drawings . These devicesexist for the allurement of insects, which, in taking thebait and satisfying their lust for sweet things, becomeunconscious pollinating agents. This relationship be-tween insects and a vast number of flowers has un-doubtedly led to great variety of floral structure. Inthe Angiosperms fertilization affects the carpels formingthe pistil; they develop into the fruit. The effectsmay also extend beyond the carpels to the calyx, oreven to the floral receptacle, as in the case of the Straw-berry, in which the receptacle becomes fleshy and iscommonly spoken of as the fruit. We find another contrast between the Gymnospermsand the Angiosperms in the fact that the former aremuch restricted in habitat and range, whereas thelatter have exhibited much elasticity in adaptationto a great variety of conditions. One can hardly dis-cover an environment where Angiosperms are notto be found. If we wander over the tractless desert,we find some species there. They have invaded pond, Plate GARLIC, or RAMSONS (),Order LILIACEJE. 1. Pistil 2. Cross section of ovary MONOCOTYLEDONS 193 lake, stream, and even the sea; they occur as giant treesand lowly herbs, as epiphytes and climbers, as insect-consumers and degraded parasites; their potentialitiesseem to be practically limitless. The Angiosperms occur in two natural classes, theMonocotyledons and Dicotyledons. Although thereis similarity of structure in the two classes, there areradical distinctions which make itdifficult to define their relation-ship. Monocotyledons . Cotyledons are seed-leaves; theyare developed in the embryo whileit is still enclosed in the seed, andthey are primary — , they arethe first to appear when the seedgerminates. Fig. 62 is a drawingof a Wallflower seedling in which Fig. , care the cotyledons. The reader ^^^J^^^^- ^^^^will note that they are different ^^ ^^ cotyledons
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1915
