. Nature and development of plants. Botany. 448 THE ROSALES spirally arranged. Thus, in the live-forever (Sedum), we have a flower that has always been cited as the typical flower of the angi- osperms. It is very regular with five whorls of alternating parts of five members each, i. e.: 5 sepals, 5 petals, 5 to 10 stamens (one or two whorls) and usually 5 pistils (Fig. 310, A). This type. Fig. 310. Simple forms of the Rosales: A, flower of Sedum, showing the radial symmetry of the flower and five organs in each whorl. B, grass of Parnassus (Parnassia), a member of a closely-allied family. C, f
. Nature and development of plants. Botany. 448 THE ROSALES spirally arranged. Thus, in the live-forever (Sedum), we have a flower that has always been cited as the typical flower of the angi- osperms. It is very regular with five whorls of alternating parts of five members each, i. e.: 5 sepals, 5 petals, 5 to 10 stamens (one or two whorls) and usually 5 pistils (Fig. 310, A). This type. Fig. 310. Simple forms of the Rosales: A, flower of Sedum, showing the radial symmetry of the flower and five organs in each whorl. B, grass of Parnassus (Parnassia), a member of a closely-allied family. C, flower on first day of bloom, stamens converging over the pistil and encircled by row of modified stamens. D, section of flower, showing slight growth of base of receptacle and consequent adhesion to perianth. This flower is protandrous and the stamens in shedding the spores straighten up one by one on succeed- ing days and curve back towards the petals. The section shows three positions assumed by the stamens. You may calculate the significance of these features. closely resembles the arrangement of parts in the buttercups, save for the slight adhesion of the calyx and receptacle (Fig. 310, D). These fleshy plants as illustrated in the houseleek (Fig. 69), hen and chickens, etc., are very common forms of 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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