Blue-purple flowers  Leaves alternate

Allium vineale

Amorpha canescens

Amorpha fruticosa

Amphicarpa bracteata

Amsonia ciliata

Amsonia illustris

Amsonia tabernaemontana

Aster anomalus

Aster azureus

Aster linariifolius

Aster novae-angliae

Aster oblongifolius

Aster patens

Aster sericeous

Baptisia australis

Campanula americana

Campanula rapunculoides

Campanula rotundifolia

Centaurea cyanus

Cichorium intybus

Clitoria mariana

Commelina communis

Commelina diffusa

Commelina erecta

Commelina virginica

Cynoglossum virginianum

Datura stramonium

Delphinium ajacis

Delphinium carolinianum

Delphinium exaltatum

Delphinium tricorne

Dodecatheon meadia