The anther of a tomato flower is shaped like a hollow tube, with the pollen produced within the structure, rather than on the surface, as in most species.
From the en.wikipedia.org
It was a large tube-shaped structure made of cement blocks, perhaps sixty feet high, wide at the base and narrowing as it went upward, and painted in red and white barber-pole stripes.
From the online.wsj.com
Ray florets are always highly zygomorphic and are characterised by the presence of a ligule, a strap-shaped structure on the edge of the corolla tube consisting of fused petals.