In angiosperms, the flower is the reproductive unit.
On the swollen end of the stalk or pedicel, called the thalamus or receptacle, a typical flower has four different kinds of whorls placed sequentially.
Calyx, corolla, androecium, and gynoecium are the four flower parts.
Bracteate flowers:
Bracteate flowers are those that have bracts (a reduced leaf at the base of the pedicel).