Here is a brief information on the each figure in Primavera.
Mercury: A major roman god of financial gain, commerce, eloquence, messages/communication (including divination), travelers, boundaries, luck, trickery and thieves; he is also the guide of souls to the underworld.
Three Graces: Three Graces are goddesses of charm, beauty and creativity in Greek mythology. Roman mythology calls them as Charites.
Venus: Goddess of Love beauty, sex, fertility and prosperity in Roman mythology (“Aphrodite” in Greek mythology).
Cupid: The god of desire, erotic love, attraction and affection. He is often portrayed as the son of the love goddess Venus, and is known in Latin also as Amor (“Love”). His Greek counterpart is Eros.
Flora: A goddess of flowers and the season of spring. Her Greek equivalent was Chloris. Thus, both figures, Flora and Chloris are said to be companions of each other, instead of parting them differently.
Chloris: Chloris was a Nymph associated with spring, flowers and new growth, believed to have dwelt in the Elysian Fields. As mentioned above, the Roman equivalent of the figure is Flora.
Zephyrus: God of west wind in Greek mythology. Also the messenger of spring.
On the floor of the painting, allegedly, have sprouted out a total of 500 different types of plants and 190 types of flowers. The grove is full of orange trees. One the upper left corner of the painting are the dark clouds which mercury is stopping from coming in and ruining everything.