Pomona

Pomona or Pompona is the minor Roman goddess of plenty (Fruit trees, gardens and orchards). The pruning knife was her attribute. The wood nymph Pomona lived in the forest between Rome and its port at Ostia. It was her special duty to look after the fruit trees in a wood called Pomonal. She was beautiful, and many gods of nature and the countryside came to earn her love. But Pomona loved none of them, until Vertumnus revealed himself to her in his true form.

Percy Jackson and the Olympians
The Last Olympian Percy Jackson met a bronze statue of Pompona during the Battle of Manhattan, and mistook her for the Greek goddess Demeter, and she reacted in indignation. She angrily threw metal apples on Percy. She was on the side of the Titans saying the minor gods don't have recognition.

Heroes of Olympus
The Lost Hero Clovis tells Annabeth and Jason that she is strictly Roman, and doesn't have a Greek counterpart.

Trivia

 * Pomona does not have a Greek counterpart (along with a few other gods like Janus).
 * She was particularly associated with the blossoming of trees rather than with the harvest.
 * Pomona is also another word for mainland in Orkney.
 * According to her she is often mistaken for Demeter.