. Plant life, considered with special references to form and function. Plant physiology. DISTRIBUTION OF SPORES AND SEEDS. 361 ^ng also prevents the visits of any insects except those flying at tliat particular season. III. Adaptations to the distribution of seeds". 489. After the ripening of the seed various devices and forces operate to scatter them at as great a distance as pos- sible from tlie parent, so that the young plants will not come into competition with the old ones or with each other. This object, which is secured in lower plants hiy the distribution of the spores, can only b
. Plant life, considered with special references to form and function. Plant physiology. DISTRIBUTION OF SPORES AND SEEDS. 361 ^ng also prevents the visits of any insects except those flying at tliat particular season. III. Adaptations to the distribution of seeds". 489. After the ripening of the seed various devices and forces operate to scatter them at as great a distance as pos- sible from tlie parent, so that the young plants will not come into competition with the old ones or with each other. This object, which is secured in lower plants hiy the distribution of the spores, can only be attained in seed plants by scatter- ing the seed, because the megaspore is not set free; the ga-. FtG. 405.—Elastic valves for slinging seeds, .-i, fruit of \vild geranium ((7. f'alustre') with persistent calyx. The Hve carpels surround an elongated torus, from which they break first at bottom ; curling upward suddenly they sling the seed out of the basal part which has cracked along the inner side. />', fruit of touch-me-not {Iinpatiens no/i-znc-t^H^fj-e), one sound, the other bursted The carjjels ha\'e curled up elasti- cally from the base and slung out the seeds. Natural size.—After Kerner. metophyte is consequently developed within the sporophyte ; and the embryo sporophyte is likewise enclosed by the old sporophyte (See 1 408.). 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 Barnes, Charles Reid, 1858-1910. New York, H. Holt & company
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