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Use this feature to determine if perianth segments or tepals on a flower are free or fused into a tube. Note that perianth segments or tepals may be closely appressed but not fused.
Note: if you have Asteraceae heads, this feature applies only to disc florets, not ray florets.
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| perianth segments not fused, not forming a tube Use this state if perianth segments or tepals are completely distinct or fused only at the very base and not appearing to be a tube. |
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| perianth segments fused, forming a tube Tubes are of various shapes and sizes; see the feature Corolla or perianth tube shape. |
some segments fused, others free, or all fused into an open (split) tube Also use this state if a tube is only partially split. |
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