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Each of these "streamers" is, in fact, a young grass-plant, budded off "viviparously," as it is called, from the flower-head, or "spikelet," and having nothing to do with the proper fertilized seed or grain. The young plants so budded fall to the ground, and striking root rapidly, grow into separate individuals. Both the viviparous grass and the polygonum are found in England.
Still more remarkable are the cases in which, as in the Aphis, an egg gives rise to an imperfect female, from which other imperfect females are born viviparously, grow, and in their turns bear other imperfect females; and so on for eight, ten, or more generations, until finally, perfect males and females are viviparously produced.
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