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R. lanatum; 15. R. virgatum; 16. R. campylocarpum; 17. R. ciliatum; 18. R. Hodgsoni; 19. R. campanulatum. Above 12,000 feet: 20. R. lepidotum; 21. R. fulgens; 22. R. Wightianum; 23. R. anthopogon; 24. The flowers are uni-sexual, green, and in racemes, and the fruits, of which two or three grow together, are about four inches long, and one in diameter.
It is, it would seem, only in exceptional cases and for limited periods that uni-sexual or fatherless reproduction can be advantageous to a species of plant or animal. Such cases are those in which abundant food, present for a limited season, renders the most rapid multiplication of individuals an advantage to the species.
Behind this pronouncement of an expert, one might well shelter oneself; but the question under consideration merits a little further treatment. The reproduction of kind, though usually a bi-sexual process, may, however, normally in rare cases be uni-sexual, and this process is known as Parthenogenesis.
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