. The Botanical Class-Book and Flora of Pennsylvania. 1J&& M 196. The Umbul (Fig. 78,) only differs from a corymb. 56 INFLOKKSOENCE. in having all the pedicels arising from the same point, andare mostly equal in length, as in the Asclepias, Cowslip,Primrose, and the Umbelliferte generally. 107. A Head (or Capitulum, Fig. 79,) is the same as anumbel with the pedicels all shortened, so as to bring theflowers all into a close rounded head, as in the Clover, Button-bush, Teasel. The axis or rachis of a head is called the receptacle. Fre-quently, instead of being at all prolongated, it is flat and
. The Botanical Class-Book and Flora of Pennsylvania. 1J&& M 196. The Umbul (Fig. 78,) only differs from a corymb. 56 INFLOKKSOENCE. in having all the pedicels arising from the same point, andare mostly equal in length, as in the Asclepias, Cowslip,Primrose, and the Umbelliferte generally. 107. A Head (or Capitulum, Fig. 79,) is the same as anumbel with the pedicels all shortened, so as to bring theflowers all into a close rounded head, as in the Clover, Button-bush, Teasel. The axis or rachis of a head is called the receptacle. Fre-quently, instead of being at all prolongated, it is flat and dila-ted longitudinally, so as to allow a huge number of flowersto stand on its level surface, as in the Sunflower, and theCompositac (compound flowers) generally.
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