vespertine

[ves-per-tin, -tahyn] /ˈvɛs pər tɪn, -ˌtaɪn/
adjective
1.
of, pertaining 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.
Also, vespertinal
[ves-per-tahyn-l] /ˌvɛs pərˈtaɪn l/ (Show IPA)
.
Origin
1495-1505; < Latin vespertīnus, equivalent to vesper vesper + -tīnus adj. suffix
British Dictionary definitions for vespertine

vespertine

/ˈvɛspəˌtaɪn/
adjective
1.
(botany, zoology) appearing, opening, or active in the evening: vespertine flowers
2.
occurring in the evening or (esp of stars) appearing or setting in the evening
Word Origin and History for vespertine
adj.

c.1500, "of the evening," from Latin vespertinus, from vesper (see vesper).