. Gli elementi strutturali di botanica [microformati] : con particolare riferimento allo studio delle piante canadese, al quale è stata aggiunta una selezione delle prove d'esame. Anatomia vegetale; botanica; Plantes; Botanique. Caratteri comuni a monocotiledoni. 85. trovato per essere contrassegnati da caratteri posseduti da tutti i suoi membri. I fiori di dicotiledoni sono stati trovati per avere le loro parti, come una regola, a quattro a quattro o cinque ; quelli del secondo gruppo sono in numero di tre o dxes^ mai in cinque. 116. In questo caso le foglie di queste piante sono dritte- venato, tranne in Trillium e rapa indiana, che deve essere considerata come excepti

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. The elements of structural botany [microform] : with special reference to the study of Canadian plants, to which is added a selection of examination papers. Plant anatomy; Botany; Plantes; Botanique. CHARACTERS COMMON TO MONOCOTYLEDONS. 85. found to be marked by characters possessed by all its members. The flowers of Dicotyledons were found to have their parts, as a rule, in fours or fives ; those of our second group have them in threes or dxes^ never in fives. 116. Again, the leaves of these plants are straight- veined, except in Trillium 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 found to characterize the Exogens. 117. We shall now compare the structure of a grain of Indian Corn with that of the Cucumber or Fig. no. Fig. Hi Fig. 111. Pumpkin seed which we have already examined (page 59). 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 differs 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. 110) in the middle of one side. This latter body is the embryo^ and may be easily removed. All tlie rest is albumen. Fig. Ill is a front view of the embryo, aud Y'v^. 112 shows a vertical section of the same. Tlie greater part of the Figs. 110, 111, 112.—Sections of a grain of Indian Corn. (Gray.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Spotton, H. B.

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1890
• booksubjectbotany
• booksubjectpl