In which of the given plants the corolla has some petals fused and some free?

Corolla of pea has five petals. The anterior petals are fused and form a boat shaped structure in which the androecium and gynoecium are protected. These petals are called keel petals. The two lateral petals known as wings or alae and the posterior largest petal known as standard petal or vexillum are free. Corolla of Fabaceae is described as papilionaceous.