. Introduction to structural and systematic botany, and vegetable physiology. Botany. INDETERMINATE INFLORESCENCE. 213 determinate infloresence, with the primary axis elongated, and the flowers destitute of pedicels or with only very short ones. Two varieties of the spike have received independent names, viz. the Spadix and the Ament. 390. A Spadix is a fleshy spike enveloped by a large bract or mod- ified leaf, called a Spathe, as in Calla palustris (Fig. 313), the Indian Turnip (Fig. 314), and the Skunk Cabbage (Fig. 1205).. 391. An Ament, or Catkin, is merely that kind of spike with scaly b
. Introduction to structural and systematic botany, and vegetable physiology. Botany. INDETERMINATE INFLORESCENCE. 213 determinate infloresence, with the primary axis elongated, and the flowers destitute of pedicels or with only very short ones. Two varieties of the spike have received independent names, viz. the Spadix and the Ament. 390. A Spadix is a fleshy spike enveloped by a large bract or mod- ified leaf, called a Spathe, as in Calla palustris (Fig. 313), the Indian Turnip (Fig. 314), and the Skunk Cabbage (Fig. 1205).. 391. An Ament, or Catkin, is merely that kind of spike with scaly bracts borne by the Birch (Fig. 312), Poplar, Willow, and, as to one of the two sorts of flowers, by the Oak, Walnut, and Hickory, which are accordingly called amentaceous trees. Catkins usually fall off in one piece, after flowering or fruiting, especially sterile catkins. 392. The Head, or Capitulum, is a globular cluster of sessile flowers, like that of Clover, the Button-Bush (Fig. 320), and the balls of the Buttonwood or Plane-tree. It is a many-flowered centripetal in- florescence, in which neither the primaiy axis *ior the secondary axes are at all lengthened. We may view it either as an umbel without any pedicels, or as a spike with a very short axis. Gen- erally it is of the latter character, as is evident in a Clover-head, where what was first a head frequently elongates into a spike as it grows older. FIG. 313, 31i. Spadix of Calla and of Arum, with the epathe. 315. A raceme of Cherry. 317. A cyme. 318. Panicle of TVIeadow-Graas. 319. A 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 Gray, Asa, 1810-1888. New York [etc. ] Ivison, Blakeman, Taylor & Co.
Size: 1735px × 1441px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorgra, bookcentury1800, bookdecade1850, booksubjectbotany
