. The classification of flowering plants. Plants. .838 FLOWERING PLANTS [CH. Marantaceae, but without the lignle of the former or the pulvinus of the latter. The inflorescence is terminal and forms a spike, or branching occurs, so that each bract on not a single flower, but generally the main axis subtends, a two-flowered cincinnus ( Fig. 158. Flowering shoot of Canna indica, much reduced ; a, anther ; b, petaloid style ; I, labellum ; p, petal; s, sepals; st, staminodes. A. Fruit, sMghtlv reduced. B. Seed cut length- wise ; c, sucker of cotyledon ; i, in- growth of hard testa around the
. The classification of flowering plants. Plants. .838 FLOWERING PLANTS [CH. Marantaceae, but without the lignle of the former or the pulvinus of the latter. The inflorescence is terminal and forms a spike, or branching occurs, so that each bract on not a single flower, but generally the main axis subtends, a two-flowered cincinnus ( Fig. 158. Flowering shoot of Canna indica, much reduced ; a, anther ; b, petaloid style ; I, labellum ; p, petal; s, sepals; st, staminodes. A. Fruit, sMghtlv reduced. B. Seed cut length- wise ; c, sucker of cotyledon ; i, in- growth of hard testa around the lower part of the embryo ; r, radicle: t. testa ; X 2. C. Floral diagram shewing bract, and V, bracteole (in which branching may occur), and arrangement of stam- ina! whorls on Eichler's interpretation; Z, labellum. D. Diagram shewing composition of staminal whorls on the older view. C, D, after Eichler. lateral stamen of the whorl and the entire outer whorl are suppressed. On the older view (fig. 158, D) the fertile stamen, the labellum, and one of the staminodes represent the inner staminal whorl, while the remaining staminodes belong to the outer staminal whorl. 158, C). The bracteoles are lateral. The sepals are free, small and herbaceous or sca- rious (fig. 158, s). The petals ip), which like the sepals are imbricate and follow in regular succession, are united into a tube below; they are much larger than the sepals, coloured and subequal. The most conspicuous fea- ture of the flower is the androe- cium, which consists of a jDetaloid stamen bearing a half- anther (a) on one edge and a number of flat petaloid struc- tures {st), one of which, the labellum (I), is rolled back on itself (see also fig. 159). The labellum, according to Eichler's^ interpretation of the morphology of the flower (fig. 158, C), represents a lateral stamen of the inner whorl while the fertile stamen with the two or three staminodes (which are united at the base with the stamen) represent to- gether t
Size: 1224px × 2042px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectplants, bookyear1904
