Blue-purple flowers  Leaves opposite

Ajuga reptans

Blephilia ciliata

Buchnera americana

Caryopteris sp.

Chaenorrhinum minus

Clematis pitcheri

Clematis versicolor

Collinsia verna

Conobea multifida

Cunila origanoides

Diodia teres

Dipsacus sylvestris

Eryngium prostratum

Eupatorium coelestinum

Eupatorium fistulosum

Eupatorium purpureum

Gentiana quinquefolia

Geranium maculatum

Glechoma hederacea

Hedeoma hispida

Houstonia caerulea