Clematis Alba Luxurians: flowers from July to September and is best planted to scramble through a mature, spring-flowering shrub such as a viburnum or holly. Pruning is easy, just cut back hard early in spring. 2.5-3m (8-10ft).
Eriogonum latifolium or "Seaside Buckwheat" Eriogonums are very popular with butterflies and bees. Specifically mentioned were Hairstreaks and Acmon blues, which use Buckwheat (especially E. nudum in my area), as a host plant.
"Bat plant (Tacca chantrieri) has deep purple, almost black bracts on tall, 20-inch flowering stems. The flowers, which can grow up to 10 inches long, superficially resemble a bat in flight with long whiskers. The foliage of this unusual-looking shade-loving plant resembles Spathiphyllum, and its color and odor attract bats and flies to achieve cross-pollination". via @Chicago Botanic Garden