. Botany for high schools and colleges. Botany. 152 parasticliics passing to the riglit, while leaves 3, 6, 9, 12, Ibj 18 belong to the parastichies which pass to the left. (5.) Upon counting, in Fig. 129, it is found that there are three parastichies passing to the left and five to the right; the smaller number is the same as the numerator of the fraction expressing the angular divergence, while the sum of the two equals the denomi- nator ; similar rela- tions may be shown to Fig. 130, — Diagram of eight-ranked arrange- . , . ,-, ment, viewed from above. The orthostichies, wliich CXl
. Botany for high schools and colleges. Botany. 152 parasticliics passing to the riglit, while leaves 3, 6, 9, 12, Ibj 18 belong to the parastichies which pass to the left. (5.) Upon counting, in Fig. 129, it is found that there are three parastichies passing to the left and five to the right; the smaller number is the same as the numerator of the fraction expressing the angular divergence, while the sum of the two equals the denomi- nator ; similar rela- tions may be shown to Fig. 130, — Diagram of eight-ranked arrange- . , . ,-, ment, viewed from above. The orthostichies, wliich CXlSt in OtUer CaSCS. here appear to be radial lines, are numbered, as in nr\r\ T-P Fig. 129, from/. to F///. The leaves are number- ^UO.— il UOW We ed from 1 to Sachs. g^^^^ ^^^ ^Q^Q^l ^Y- rangements by projecting the stem upon a flat surface in such a way that the successive nodes, in ascending the stem, are represented by smaller and smaller concentric circles (Fig. 130) (as would, in fact, be the case if we made sections through the nodes of the punctum vegetationis), it is at once evident that each leaf is so placed as to stand over the vacant space between the previously formed ones, and that as regards the leaves formed after it, it is equally well situated. Hofmeister formulates this to the morpliologist. So much has this been done, that the study of Phyllotaxis has in some quarters become little more than a species of mathematical 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 Bessey, Charles Edwin, 1845- [from old catalog]. New York, H. Holt and company
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