. A manual of the medical botany of North America [microform]. Botany, Medical; Botany; Botanique médicale; Botanique. 40 ELKAIENTS OF BOTANY. Every farmer knows tlmt if two varieties of com, say yellow and wbite, be planted side by side, the result will be a great many ears of speckled corn, those with both white and yellow kernels interniingled. Is'ow, corn is a monoecious plant, the pollen being produced in vast quantities by the tassels (stamens), while the silk of the ears represent the exposed portions of the pistils. Naturally two varieties growing side by side will have their showers o
. A manual of the medical botany of North America [microform]. Botany, Medical; Botany; Botanique médicale; Botanique. 40 ELKAIENTS OF BOTANY. Every farmer knows tlmt if two varieties of com, say yellow and wbite, be planted side by side, the result will be a great many ears of speckled corn, those with both white and yellow kernels interniingled. Is'ow, corn is a monoecious plant, the pollen being produced in vast quantities by the tassels (stamens), while the silk of the ears represent the exposed portions of the pistils. Naturally two varieties growing side by side will have their showers of pollen intermingled by the wind, and grains of eacli falling upon the silk of the same ear will produce a mixture of ditlerent colored kernels, for the pollen will determine the chai-acter of the kernel produced by the ovule which it fertilizes. Again, the pumpkin and squash are closely related species, and cannot be grown side by side without hybridizatit)n. But, as in the animal king- dom, the production of hybrids is limited to closely related species or varieties, and cannot be effected by the crossing of in- dividuals of widel3- different genera. Strictly speaking, the hybrid is the product of the crossing of related species, but in a wider sense it may, without impro- priety, be applied in plant life to the crossing of varie- ties, as in the instance of corn. THE FRUIT. The frait is the fertilized and matui'ed ovar\^ en- closing the seeds, capable of reproducing the plant. Not unfrequently, also, it comprises the remaining parts of the pistil, more or less altered, or the enlarged and variously modified calyx and receptacle. Fi'uits arc distinguished as f^invplc or compovvd. A simple fruit consists of a single matured pistil, Avhetlier this be simple or compound, together with its enclosed seed or seeds, the seed-vessel, termed peri- carp, being the matured ovary, and the seed the ferti- lized and matured ovule. Tlie pericarp is distinguished into three layers, namely,
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Keywords: ., boo, bookcentury1800, booksubjectbotany, booksubjectbotanymedical
