(Agalinis tenuifolia macrophylla)
Agalinis tenuifolia is 20 to 60 centimeters tall, with a slender, paniculately branched stem. Its simple opposite leaves are 20 to 50 millimeters long, and only 1 to 3.5 millimeters wide. The flowers are borne on 10 to 20 millimeter long pedicels. Each flower is bilaterally symmetrical, with five 10 to 15 millimeter long petals fused into a corolla tube, and four stamens. The fruit is a round 3 to 7 millimeter long dry capsule that splits open when ripe.