The elements of botany for beginners and for schools . n nmbel, if its pedicels were all shortened until tlie flowers became sessile. The head of the Button-bush is naked; but that of the Thistle, of the Dandelion, and the like, is surrounded by empty bracts, wliich form an Involucre. Two particular forms of the spike and the head have received particular names, namely, the Spadix and the Catkin. 212. A Spadix is a fleshy spike or head, with smalland often imperfect flowers, as in the Calla, IndianTurnip, (Fig. 206), Sweet Flag, etc. It is commonlysurrounded or embraced by a peculiar envelopin
The elements of botany for beginners and for schools . n nmbel, if its pedicels were all shortened until tlie flowers became sessile. The head of the Button-bush is naked; but that of the Thistle, of the Dandelion, and the like, is surrounded by empty bracts, wliich form an Involucre. Two particular forms of the spike and the head have received particular names, namely, the Spadix and the Catkin. 212. A Spadix is a fleshy spike or head, with smalland often imperfect flowers, as in the Calla, IndianTurnip, (Fig. 206), Sweet Flag, etc. It is commonlysurrounded or embraced by a peculiar enveloping leaf,called a Spathe. 213. A Catkin, or Ament, is the name given to thescaly sort of spike of the Birch (Fig. 207) and Alder,the Willow and Poplar, and one sort of flower-clustersof the Oak, Hickory, and the like, — the so-called Amen-taceous trees. 214. Compound flower-clusters of these kinds arenot uncommon. Wiien the stalks which in the sim-ple umbel are the pedicels of single flowers themselvesbranch into an umbel, a Compound Umbel is Fio. 205. Head of the Button-bush (Cephalanthus). Fio. 206. Spadix and spathe of the Indian Turnip; the latter cut through below. FlQ. 207. Catkin, or Ament, of Birch. T6 FLOWEES. [section 8.
Size: 871px × 2869px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1887
