Azure bluets is an erect forb, 5-20cm tall, with narrowly oblong sepals, 1-2mm, and acute. Corolla are typically rather light blue-lavender with a pale yellow eye, a slender tube and an abruptly spreading, flattened limb. The corolla tube is 5-10mm, smooth within, the limb is 10-14mm wide, stamens included, styles are of different lengths. Fruits are flattened, 3-4mm wide, much broader than long. Seeds are globular, with a deep round cavity occupying the inner face. Lower leaves are oblanceolate to spatulate, 5-12mm, narrowed to a petiole often as long, the upper leaves are subsessile, and oblong-spatulate to linear.