. Botanica elementare . La botanica. Fiori ciclico 71 XiX. e simili metà da tagli verticali realizzati in diversi piani (direzioni); considerando che negli altri due impianti denominati parti di me non sono regolari, e il fiore può ugualmente essere dimezzato da un taglio effettuato solo in una direzione-vale a dire passando attraverso il centro di standard ed essere- tween due chiglia- petali. Tutti questi fiori menzionati sono detto di essere simmetrico, perché è possibile dividerli in due metà simile. Il Geranio e Hya- cinth fiori sono sym- metrico in vari piani (direzioni), o actinomorphic: il pisello e trifoglio f

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. Elementary botany . Botany. CYCLIC FLOWERS 71 XiX. and similar halves by vertical cuts made in several different planes (directions); whereas in the other two plants named me parts are not regular, and the flower can be equally halved by a cut made only in one direction—i.e. passing through the middle of the standard and be- tween the two keel- petals. All these flowers mentioned are said to be symmetrical, because it is possible to divide them into two similar halves. The Geranium and Hya- cinth flowers are sym- metrical in several planes (directions), or actinomorphic: the Pea and Clover flowers are symmetrical in one plane (direction) only, or zygomorphic. The zygomorphy of flowers is caused by the irregular growth, by suppression, by fusion, or by doubling of their parts.* When a cyclic flower cannot be divided into two equal halves, it is said to be asymmetrical {e.g. some members of the Pink-family). It is convenient to have some method of describing the relative positions occupied by the parts of a flower and the stem on which the latter is inserted. The half of the flower which faces the bract, or leaf, in the axil. of which the flower stands, is said to be the anterior h'alf; whilst the half of the flower which faces the inflorescence - axis is the posterior half. The plane dividing the flower vertically into its posterior and anterior halves is the transverse plane. Whereas. -.as .hr. Fig. 100.—Floral diagram of same flower. * In the majority of books a flower is not said to be zygomorphic when its solitary deviation from an actinomorphic flower is tlae suppression of some of its carpels. For example, many regular flowers possess five sepals, five petals, but only two carpels. If we assume that each floral leaf cut must be exactly halved, these flowers are, strictly speaking, symmetrical only in one. plane : nevertheless, they are usually described as actinomorphic.. Please note that these images are extracted from scanned page images that may have b

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1890
• booksubjectbotany
• bookyear1898