The elements of botany for The elements of botany for beginners and for schools elementsofbotany00grayuoft Year: [1887] toecome if its axis were shortened; or an umbel, if its pedicels were all shortened until the 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, which form an I/ivolucre. 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 small and often imperfect flowers, as in the Call
The elements of botany for The elements of botany for beginners and for schools elementsofbotany00grayuoft Year: [1887] toecome if its axis were shortened; or an umbel, if its pedicels were all shortened until the 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, which form an I/ivolucre. 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 small and often imperfect flowers, as in the Calla, Indian Turnip, (Fig. 206), Sweet Flag, etc. It is commonly surrounded or embraced by a peculiar enveloping leaf, called a Spathe. 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 are the pedicels of single flowers tliemselves branch into an umbel, a Compound Umbel is formed. Fig. 205. Head of the Button-bush (Cephalanthus). Fig. 206. Spadix and spathe of the Indian Turnip; the latter cut through below. Fig. 207. Catkin, or Ament, of Birch.
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