1) Petaled 2) Petalled 3) Petalous 
with a slender tube abruptly expanded into a rotate limb
<botany> Said of a corolla in which the tube is essentially cylindrical, the lobes abruptly spreading, a gamopetalous corolla. ... (14 Oct 1997) ... 
with a slender tube abruptly expanded into a rotate limb
Trumpet-shaped, usually used to describe a sympetalous corolla with a slender tube and an abruptly flared limb.
[adj] - of or concerning a gamopetalous that has a slender tube and an abruptly expanded tip
adjective of or concerning a gamopetalous that has a slender tube and an abruptly expanded tip