vespertinal

adjective

1. of, relating to, or occurring in the evening: vespertine stillness.
2. Botany. opening or expanding in the evening, as certain flowers.
3. Zoology. appearing or flying in the early evening; crepuscular.

adjective

1. botany zoology appearing, opening, or active in the eveningvespertine flowers
2. occurring in the evening or (esp of stars) appearing or setting in the evening