This feature covers fusion
of petals or the most petalpetal:
(n) one segment of the corolla
-like segments. The state "all segments
free (distinct)" includes segments that are fused only at the very
base. The "segments fused" state includes a range of types of
fusion. Flowers with fused segments may form a distinct tube or cup, or
tubes may be split down the side, or have some segments fused and some
not. Additionally, lobes may be longer or shorter than the tube, narrow
to broad, and tubes may be tubulartubular:
(adj) (of a corolla, perianth, calyx tube or other structure) (1) tube-shaped; cylindrical: narrow and elongate with more or less straight sides; (2) having segments fused into a tube (of any shape)
to bell-shaped to plate-like.