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Parthenogenesis, or the development of an embryo from an egg-cell without the latter having been fertilized, has been described in species of Thalictrum, Antennaria and Alchemilla. Polyembryony is generally associated with the development of cells other than the egg-cell. Thus in Erythronium and Limnocharis the fertilized egg may form a mass of tissue on which several embryos are produced.
So much have we seen on one little shell. But there is more to see close to it. Those yellow plants which I likened to squirrels' tails and lobsters' horns, and what not, are zoophytes of different kinds. The lobsters' horns are Antennaria antennina; and mingled with them are Plumulariae, always to be distinguished from Sertulariae by polypes growing on one side of the branch, and not on both.
I now realized that the trees that I had noticed were to be found only upon the banks of streams and lakes, and that, with the exception of the green these afforded, Mars was entirely covered with a small and hardy pink flower of the antennaria family, which flourishes in a dry and sandy soil.
I have been told of another robin's nest upon the outside of which the bird had fastened a wooden label from a near-by flower-bed, marked "Wake Robin." Still another nest I have seen built upon a large, showy foundation of the paper-like flowers of antennaria, or everlasting. The wood thrush frequently weaves a fragment of newspaper or a white rag into the foundation of its nest.
There are varieties of artemisia or sage-brush, antennaria, columbine, the barberry, spiraea, Russian thistle, eriophyllous, chrysothamnus, plantago, dandelions, lepidium, chaenactic, linum, hosackia, cirsium, astragulus, ambrosia, euphorbia, pleustemon, achillea millefolium, erodium, or stork's bill, orthocarpous, vilia, solidago, lactuca, helianthus, erigeron, brickellia, malvastrum, ptelea or a desert hop-tree, polygonum, sphedra, lupines, castilleia, lathyrus, verbena and a score of others.
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