. Text-book of botany, morphological and physiological. Botany. DICOTYLEDONS. 647 Berberis, S3+3 P3+5 Sl5+3 Cv Podophyllum, Sz P3J St3\3 Cv Cruciferae, S2+2 PXi £72+22 C2(+2). A large number of examples of this general formula are afforded by the family Menispermacese, in which the whorls are sometimes dimerous, sometimes trimerous, while sometimes whorls of each description occur in one flower; and where almost every one of the organs may disappear by abortion1. In addition to the trimerous flowers already mentioned, there are also some which come under the first-mentioned general formula SnP
. Text-book of botany, morphological and physiological. Botany. DICOTYLEDONS. 647 Berberis, S3+3 P3+5 Sl5+3 Cv Podophyllum, Sz P3J St3\3 Cv Cruciferae, S2+2 PXi £72+22 C2(+2). A large number of examples of this general formula are afforded by the family Menispermacese, in which the whorls are sometimes dimerous, sometimes trimerous, while sometimes whorls of each description occur in one flower; and where almost every one of the organs may disappear by abortion1. In addition to the trimerous flowers already mentioned, there are also some which come under the first-mentioned general formula SnPnSln^+n) Cn^m); as, for example, Rheum with the formula Ss P3 Sl32+3 C3. Other trimerous flowers again appear to belong to a third type, as Asarum with the formula S3 Sl3+6 Cr When the number of staminal whorls is considerably increased, it not unfre- quently happens that the number of stamens in each whorl also undergoes change, and complicated alternations arise. Flowers the structure of which is otherwise altogether different resemble one another in this respect, as is shown by the Papaveraceae on the one hand (Fig. 464), and by the Cistineae and some Rosaceae on the other 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 Sachs, Julius, 1832-1897; Vines, Sydney Howard, 1849-1934. ed. and tr. Oxford, Clarendon press
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1882
