. The commonly occuring wild plants of Canada, and more especially of the province of Ontario : a flora for the use of beginners. Botany; Botany; Plants. 60 ELEMENTS OF STRUCTUR-U. BOTANY. ters common to all of them, just as the group ending with Willow was found to he marked by characters possessed by all its members. The flowers of Dicoty- ledons were found to have their parts, as a rule, in fours or fives ; those of our second group have them in threes or sixes, never in fives. 78. Again, the leaves of these plants are straight- veined, except in TriUium and Indian-Turnip, which must be reg
. The commonly occuring wild plants of Canada, and more especially of the province of Ontario : a flora for the use of beginners. Botany; Botany; Plants. 60 ELEMENTS OF STRUCTUR-U. BOTANY. ters common to all of them, just as the group ending with Willow was found to he marked by characters possessed by all its members. The flowers of Dicoty- ledons were found to have their parts, as a rule, in fours or fives ; those of our second group have them in threes or sixes, never in fives. 78. Again, the leaves of these plants are straight- veined, except in TriUium and Indian-Turnip, which must be regarded as exceptional, and they do not as a rule exhibit the division into petiole and blade which was foimd to characterize the Exogens. 79. "We shall now compare the structure of a grain of Indian Corn with that of the Cucumber or Pumpkin seed which we have already examined (page 46). It will facilitate our task if we select a grain from an ear which has been boiled. And first of all, let us observe that the grain consists of something more than the seed. The grain is very much like the achene of the Buttercup, but difiers in this respect, that the outer covering of the former is completely united with the seed-coat underneath it, whilst in the latter the true seed easily separates from its covering. Remove the coats of the grain, and what is left is a whitish starchy- looking substance, having a yellowish body inserted in a hollow (Fig. 90) in the middle of one side. This latter body is the embryo, and may be easily removed. All the rest is albumen. Fig. 91 is a front view of the embryo, and Fig. 92 shows a vertical section of the same. The greater part the embryo consists of a single cotyle- W don. The radicle is seen near the base. Fij. 90. Fig. 91 Fig. 92. and the plumule above. 80. Comparing the result of our observations with. li-s. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration
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