. Morphology of gymnosperms. Gymnosperms; Plant morphology. 366 MORPHOLOGY OF GYMNOSPERMS leaves succeeds the cotyledons (fig. 455), and is the only pair of foliage leaves produced, growing continuously at the base, where they are protected by the groove. These leaves last through the lifetime of the plant, which is said to reach more than one hundred Fig. 408.—Welwitschia mirabilis: in the foreground are two plants with lacerated leaves; in the background are seven more plants.—From a photograph by H. Schenck. The species of Gneium are either small trees or woody climbers, being among
. Morphology of gymnosperms. Gymnosperms; Plant morphology. 366 MORPHOLOGY OF GYMNOSPERMS leaves succeeds the cotyledons (fig. 455), and is the only pair of foliage leaves produced, growing continuously at the base, where they are protected by the groove. These leaves last through the lifetime of the plant, which is said to reach more than one hundred Fig. 408.—Welwitschia mirabilis: in the foreground are two plants with lacerated leaves; in the background are seven more plants.—From a photograph by H. Schenck. The species of Gneium are either small trees or woody climbers, being among the lianas of tropical forests (fig. 409). The leaves are leathery in texture, and are very suggestive of those of dicotyledons, the well-developed opposite leaves being lanceolate to ovate in outline and pinnately net-veined. VASCULAR ANATOMY So far as known, all traces of mesarch structure are lacking among the Gnetales, although it is altogether probable that it may be found in some peripheral members. However this may be, in this feature, as well as in others, the Gnetales seem farther removed from the ferns than any other group of gymnosperms, the only suggestion of con- nection being the fohar gaps. In Ephedra there is a persistent primary cambium, but not much. 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 Coulter, John Merle, 1851-1928; Chamberlain, Charles Joseph, b. 1863; Coulter, John Merle, 1851-1928. Morphology of spermatophytes. Part I. Gymnosperms. Chicago, University of Chicago Press
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