. The Botanical Class-Book and Flora of Pennsylvania. 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 flow

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. The Botanical Class-Book and Flora of Pennsylvania. 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)

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