. The origin of floral structures : through insect and other agencies. Plants; Flowers; Flowers. PROGRESSIVE METAMORPHOSES. 291 pistil, and not adherent as in the case of Mmsmnda. In both instances it will presumably be purely axial in character. Progressive changes in the calyx are not uncommon by its assuming a petaloid character. This is normal in some genera of Banunculacew, in Fuchsia, Bhodochiton, as well as in some members of the Incompletce, as in Mirabilis, Polygonum, Daphne, etc. Normally coloured sepals are most frequent in polysepalous genera. Abnormal colorisation, with or without
. The origin of floral structures : through insect and other agencies. Plants; Flowers; Flowers. PROGRESSIVE METAMORPHOSES. 291 pistil, and not adherent as in the case of Mmsmnda. In both instances it will presumably be purely axial in character. Progressive changes in the calyx are not uncommon by its assuming a petaloid character. This is normal in some genera of Banunculacew, in Fuchsia, Bhodochiton, as well as in some members of the Incompletce, as in Mirabilis, Polygonum, Daphne, etc. Normally coloured sepals are most frequent in polysepalous genera. Abnormal colorisation, with or without any metamorphosis of the organ, is most frequent in gamosepalous flowers, as in the cultivated " hose-in-hose" varieties of Primula, Mimulus and Azalea. The calyx may be petaloid either wholly or in part only. In Musscenda (Pig. 68), one sepal only is normally sub-petaloid. Calceolaria has occasionally one or more sepals petaloid. Similarly Linaria (Fig. 69) and other in- stances might be mentioned. These condi- tions, brouEfht about by cultivation, clearly rig. et.âLinaria. , . , ji . 1 â 1 ⢠> ''"'' "OS sepal show the important part that high nounsb- petaloid. ment plays as an external stimulus or factor in the produc- tion of colour. Staminoid sepals appear to be very rare. It is recorded by M. Gris that they have occurred in Philadelphus speciosus.* Pistiloid sepals are nearly equally as rare as staminoid. They have been observed by Mr. Laxton in double flowers of the Garden Pea (Pig. 70), in which there was a. five or six-leaved calyx, some of the segpients of which were of a carpellary nature, and bore imperfect ovules on their mar- gins, the extremities being drawn out into snb-stigmatiferous * Bull. 8oc. de Bot. Fr., t. v., p. 330. t Qard. Chron. 1886, p. 897 i and Teratology, p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearanc
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