floral tube

noun Botany.
a cylinder formed in some flowers by the fusion of the perianth and stamens, as in the daffodil or iris.
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American Heritage
Science Dictionary
floral tube  
A tube formed by the fusion of parts of the perianth and often the stamens at their bases, as in flowers of the daffodil or morning glory.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Flora has six white petals and a long, slender basal floral tube.
The cor olla is bilaterally symmetrical with petals fused into a floral tube.
The length of the uncoiled tube closely matches the depth of the floral tube
  from the corolla and the nectary.
The cross-shaped flowers of the evening primrose arise from a long floral tube.
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