Text-book of structural and physiological botany . Fig. 256.^Longitudinal section through the rosaceous —Mitraeform flowerflower of the rose; the pistil seated in of of the grape-vine (mag-the urceolate calyx. nified). in the grape vine, consists of five petals which are coherentat their tips, and become detached at their base on the ex-pansion of the flower, thus covering the inner petals of theflower like a cap. The petals usually break off when they fall by an articu-lation at their base, but often remain attached and withered,as in Campanula [when they are said to \i^marce
Text-book of structural and physiological botany . Fig. 256.^Longitudinal section through the rosaceous —Mitraeform flowerflower of the rose; the pistil seated in of of the grape-vine (mag-the urceolate calyx. nified). in the grape vine, consists of five petals which are coherentat their tips, and become detached at their base on the ex-pansion of the flower, thus covering the inner petals of theflower like a cap. The petals usually break off when they fall by an articu-lation at their base, but often remain attached and withered,as in Campanula [when they are said to \i^marcescent\ Thecorolla never takes any part in the formation of the fruit, asis sometimes the case with the calyx. THE PERIANTH. When the Perianth { the two floral envelopes, thecalyx and corolla) is green, as in the elm and Rumex (, 259, 260), it is said to be sefaloid] when bright-coloured or white, as in Orchideae and Liliace^ (Fig. 261), it 134 Stritctiual and Physiological Botany. is petaloid; the dry scarious perianth of grasses is
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