In a typical angiospermic flower, the calyx, corolla, androecium, and gynoecium are successively arranged on the swollen terminal end of the pedicel. This swollen structure is known as:

Step-by-step solution

The swollen terminal end of the pedicel or flower stalk is called the thalamus or receptacle. The four floral whorls, namely calyx, corolla, androecium, and gynoecium, are successively arranged on the thalamus. Peduncle is the stalk of an inflorescence. Petiole is the stalk of a leaf. Pulvinus is the swollen leaf base found in some leguminous plants. Answer: Thalamus