Thalia geniculata, AlligatorflagThalia geniculata Alligatorflag (Thalia geniculata) (Fireflag) is a tall, sturdy herbaceous perennial. Small but attractive flowers on a very tall (comparatively) plant. Flowers are purple, 3 petaled and often nodding. Leaves are large (3+ long), broadly lanceolate with long petioles and pointed tips. They emerge from the base of the plant. Flower stalks tower above the leaves. Alligatorflag typically blooms summer through fall. It occurs naturally in