The elements of botany for beginners and for schools . and of thePink and Chickweed families (Pig. 331, 332). This is ex-plained by supposing that the partitions (such as those ofPig. 329) have early vanished or have been suppressed. In-deed, traces of them may often be detected in Pinks. On the other liand,it is equally supposable that in the Primula family the free central is de-rived from parietal placentation by the carpels bearing ovulesonly at base, and forming a consolidated common placentain the axis. Mitella and Dionsea help out this conception. 312, One-celled, with Parietal Placenta
The elements of botany for beginners and for schools . and of thePink and Chickweed families (Pig. 331, 332). This is ex-plained by supposing that the partitions (such as those ofPig. 329) have early vanished or have been suppressed. In-deed, traces of them may often be detected in Pinks. On the other liand,it is equally supposable that in the Primula family the free central is de-rived from parietal placentation by the carpels bearing ovulesonly at base, and forming a consolidated common placentain the axis. Mitella and Dionsea help out this conception. 312, One-celled, with Parietal Placentae. In this notuncommon case it is conceived that the two or three ormore carpel-leaves of such a compound pistil coalesce bytheir adjacent edges, just as sepal-leaves do to form a gamo- sepalous calyx,or petals to forma gamopetalouscorolla, and asis shown in thediagram. Pig,333, and in anactual cross-sec-tion, Fig, 334, Here each carpel is an open leaf, or with some introflexion,bearing ovules along its margins; and each placenta consists of the con-.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1887
