. The classification of flowering plants. Plants. Ill] CONIFERAE 81 a subsequent union. In some cases all or a large proportion of the adult leaves are concrescent, as in Cupr^essus Macnahiana (fig. 21), or the Australian genus CalliU^is. In the flattened branch-systems of species of Libocedrus (fig. 19, B), Cupressus Laivsoniana and others, concrescence is much more apparent in the lateral than in the median leaves. The species of Juniper us fall into two sets according as the leaves are ho- momorphic (e. g. J. drypacea, fig. 22), and heteromorphic ( J. thurifera, fig. 23) re- spectively.
. The classification of flowering plants. Plants. Ill] CONIFERAE 81 a subsequent union. In some cases all or a large proportion of the adult leaves are concrescent, as in Cupr^essus Macnahiana (fig. 21), or the Australian genus CalliU^is. In the flattened branch-systems of species of Libocedrus (fig. 19, B), Cupressus Laivsoniana and others, concrescence is much more apparent in the lateral than in the median leaves. The species of Juniper us fall into two sets according as the leaves are ho- momorphic (e. g. J. drypacea, fig. 22), and heteromorphic ( J. thurifera, fig. 23) re- spectively. The leaves of the Larch fall in the first year, as also do those of Taxodium distichum and Glyptostrohus to- gether with the annual shoots of limited growth. The dwarf-shoots of the Pines with their leaves last several years before dropping, and the same applies to the short shoots of Araucaria ex- celsa and its allies. The broader-based leaves like those of the Chili Pine {Araucaria im- bricata) live ten years or more, and then gradually dry up and perish. The phyllotaxy is sometimes whorled, sometimes spiral. The former arrangement characterises the Cupressineae, and occurs R. 6. Fig. 19. A. Young plant of Libocedrus decurrens shewing cotyledons (c), primordial leaves [pr) and transitional leaves (fr). B. Branch shewing adult foliage {ad). From Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rendle, A. B. (Alfred Barton), 1865-1938. Cambridge, University press
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplants, bookyear1904
