Re: perianth tube

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Pumlla species have perianth tubes. The pods sit right on top of the
rhizomes. When you pollinate the flower and put polination tag below
flower, you later fing tag around a dried flower and the pod underneath
the tag. Then you have to move the tag before it gets lost.

MDB have a combined perianth tube and stem. The seed pods are not
wher you expect them, but usually not right on top of rhizome as with
pure pumilla species plants.

Chuck Chapman