The elements of botany for The elements of botany for beginners and for schools elementsofbotany00gray Year: 1887 become if its axis were shortened; or an shortened until the flowers became sessile. of the Button-bush is naked; but that of the Thistle, of the Dandelion, and the like, is surrounded by empty bracts, which form an Involucre. Two particular forms of the spike and the head have received particular names, namely, the Spadix Catkin. 212. A Spadix is a fleshy spike or head, with small and often imperfect flowers, as in the Calla, Indian Turnip, (Fig. 20G), Sweet Flag, etc. It
The elements of botany for The elements of botany for beginners and for schools elementsofbotany00gray Year: 1887 become if its axis were shortened; or an shortened until the flowers became sessile. of the Button-bush is naked; but that of the Thistle, of the Dandelion, and the like, is surrounded by empty bracts, which form an Involucre. Two particular forms of the spike and the head have received particular names, namely, the Spadix Catkin. 212. A Spadix is a fleshy spike or head, with small and often imperfect flowers, as in the Calla, Indian Turnip, (Fig. 20G), Sweet Flag, etc. It is commonly surrounded or embraced by a peculiar enveloping leaf, called a Spatiik. 213. A Catkin, or Ament, is the name given to the scaly sort of spike of the Birch (Fig. 207) and Alder, the Willow and Poplar, and one sort of flower-clusters of the Oak, Hickory, and the like, — the so-called Amen- taceous trees. 214 Compound flower-clusters of these kinds are not uncommon. When the stalks which in the sim- ple umbel arc the pedicels of single flowers themselves branch into an umbel, a Compound Umbel is formed. umbel, if its pedicels were all The head Fig. 20a. Head of the Button-bush (Cephalanthus). Fig. 206. Spadix and spatheof the Indian Turnip; the latter cut through below. Fio. 207. Catkin, or Ament, of Birch.
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