Trees; a handbook of forest-botany for the woodlands and the laboratory . Fig. 1. Erect shoot of Acer platanoides, Norway Maple, viewed fromthe side and from above; showing the decussate arrangement and hori-zontal display of the leaves (K). I] TWISTING OF PETIOLES 11 branches of the Silver Fir, the Yew, Chestnut, Box, Hazel,Diervilla, and many other plants, we find the leaves. Fig. 2. Lateral horizontal shoot of Acer platanoides, Norway Maple,viewed from above and showing the arrangement and display of theleaves (K). apparently arranged in a distichous manner, right and lefton the branch, or
Trees; a handbook of forest-botany for the woodlands and the laboratory . Fig. 1. Erect shoot of Acer platanoides, Norway Maple, viewed fromthe side and from above; showing the decussate arrangement and hori-zontal display of the leaves (K). I] TWISTING OF PETIOLES 11 branches of the Silver Fir, the Yew, Chestnut, Box, Hazel,Diervilla, and many other plants, we find the leaves. Fig. 2. Lateral horizontal shoot of Acer platanoides, Norway Maple,viewed from above and showing the arrangement and display of theleaves (K). apparently arranged in a distichous manner, right and lefton the branch, or in lateral series, as if combed to eachside, though closer inspection shows that their phyllo-taxy is quite different, and that the change in display isdue to twistings of the petioles (Fig. 3). Similar twistings are concerned in the disposition ofthe leaves of the Ivy, Ficus repens, and other plants whichclimb up walls, and those of prostrate plants, such asHelianthemum, Satin; repens, Lysimachia nemorum and 12 FUNCTIONS OF LEAVES [CH. others, including the Ivy (Fig. 27), when creeping on thesurface of the soil. There are other factors also of interest in these leaf-mosaics, but they do not concern phyllotaxy, and will beconsidered hereafter.
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Keywords: ., bookcentury1900, bookdecade1900, bookidtreeshandboo, bookyear1904
