The Encyclopaedia Britannica; .. A dictionary of arts, sciences and general literature . axifragaceK, wherethe parts are half superior or half inferior. In the Orchistribe, where the stamens become adherent to the pistil soas to form a column, the flowers are said to be same is the case in Aristolochia (fig. 217). Thesearrangements of parts are of great importance in classifica-tion. The stamens vary in number, from one to many hun-dreds. Like the other parts of the flower they are modifiedleaves, resembling leaves in their structure, development, andarrangement. They consist of
The Encyclopaedia Britannica; .. A dictionary of arts, sciences and general literature . axifragaceK, wherethe parts are half superior or half inferior. In the Orchistribe, where the stamens become adherent to the pistil soas to form a column, the flowers are said to be same is the case in Aristolochia (fig. 217). Thesearrangements of parts are of great importance in classifica-tion. The stamens vary in number, from one to many hun-dreds. Like the other parts of the flower they are modifiedleaves, resembling leaves in their structure, development, andarrangement. They consist of cellular and vascular appear at first in the form of cellular projections, andare arranged in a more or less spiral form. In theirgeneral aspect they have a greater resemblance to petalsthan to the leaves, and there is often seen a gradual transi-tion from petals to stamens, especially in spiral flowers, as Nymphoea alba. When noweri bccnme double by cultiva-tion, the stamens are converted into putals, as in the Paeony,Camellia, Kuse, Ac When there ii only one whorl tno. Fig. 215. Fig. 217. Fig. 215.—Section of a flower of OeranUim Rohntlnnym, c, e, calyx : />, petala: «»Btamene. The pistil la composed of ovary o, and style and stlf^nata i. t is thatonia or thalamus. The petala and stamens are bypogynoiis, and the latter arrmonadelphoua Fio. S16.—Section of the flower of Amlla tpirma. Lettets as In last flpire. Thapetals and stamens are epigynous, attached to the torus d, which covers thesummit of the ovary. The ovary is adherent to the torus, and has been laidopen to show its loculamcnts and pendulous ovules. Fin. 217.—Essential orRans of Bhthwort (.Ariitcochia). Above the ovary i, arethe stamens united in a column with the stylo at a, so as to be gynandrous. Odthe summit is the stigma above the stamens. stamens are usually equal in number to the sepals orpetals, and are arranged opposite to the former, and alternatewith the latter. The flower is then
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectencyclo, bookyear1902
