Hanabiran

Hanabiran (ハナビラン) is the plant sub-boss that appears in Hornet Man's stage and Wily Castle 2 in Mega Man 9. It appears from one of the several platforms, shoots its petals towards player and disappears again when taking damage or losing all its petals. After that it reappears again from other platform.

Strategy
The sub-boss is a clock-like frame with spikes at the bottom. The arm of the clock is a line of spike balls, however they won't kill Mega Man on contact, but will still damage him. There is a flower-like enemy that appears on one of the nine plataforms to fire its four petals. When fired, it'll then duck down in the plataform and appear on another one.

The best weapon against the flower is the Magma Bazooka. It deals critical damage to the flower, especially if all the blasts hit the flower at once. The Concrete Shot also works, but only if Mega Man is located higher than the flower.

Trivia

 * Its name is derived from the Japanese "hanabira", which means flower petal.
 * It seems to be inspired from flower clock.