. Botany for high schools and colleges. Botany. Fig. 294.—Female flower of Calli- tria quadrivalvis. d^ d, decuBsatina; carpellary leaves; Kb, six ovules. Magnified.—After Sachs. in tlie foregoing. The bract is smaller, however, and the scale attached to it soon becomes very large, thick, and woody (Figs. 389, 290, and 391). The bract and scale in this case have nearly the same relative proportions when young as they have in the mature cone of Abies pectinata. (Com- pare Fig. 388 with Figs. 393-3.) In other cases, as in CalUtris quadrivalvis, the axis is short, and the phyllomes {d, Pig. 394)
. Botany for high schools and colleges. Botany. Fig. 294.—Female flower of Calli- tria quadrivalvis. d^ d, decuBsatina; carpellary leaves; Kb, six ovules. Magnified.—After Sachs. in tlie foregoing. The bract is smaller, however, and the scale attached to it soon becomes very large, thick, and woody (Figs. 389, 290, and 391). The bract and scale in this case have nearly the same relative proportions when young as they have in the mature cone of Abies pectinata. (Com- pare Fig. 388 with Figs. 393-3.) In other cases, as in CalUtris quadrivalvis, the axis is short, and the phyllomes {d, Pig. 394) which bear the ovules are only four in number (Fig. 394, Ks, the ovules). In Taxus iaccata the flower is still more simple. It appears in the axil of a foliage leaf, and is a scaly axis, resembling a small cone (G, Fig. 384). The lower scales do not, however, bear ovules, and at the top of the axis is a single naked ovule [D and E, Fig. 384). This simplicity is carried a step further in Ginkgo, where the female flowers are merely naked axes, which bear no bracts or scales, and produce but two ovules at their sum- mits (Fig. 395, sTc).* The female flower of Gycas revoluta is a rosette of phyl- lomes, which bear some resemblance to foliage leaves, being, however, smaller. Fig. 295.—A shoot of oinTcgo biioba. es, ovnies brownish, and hairy. in pairs atthe ends of naked axes; above and on the ai I^wqt right are shown fragments of two leaves, which -tiiung uue 1 o w B 1 are seen to be broad. Nat. size.—After Sachs. parts of their mar- gins they produce a number of spherical naked ovules (sk, * The morphology of the flowers of Ginkgo, as here given, is by no means satisfactory. Instead of the ovules being borne upon naked axes, it is probable that they are in reality upon foliar organs—,. either modified leaves, somewhat as in Oycao, or upon elongated homo-. Please note that these images are extracted from scanned page images that may have been digitally enhanced f
Size: 1843px × 1356px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1888
