DRAGONHEAD, Dracocephalum parviflorum Nutt. 1, upper part of plant; 2, lower part of plant;. 3, flowers. Annual or biennial, reproducing by seeds. Stems square, erect, 8 to 40 inches (20 to 100 cm) tall, either single or in clumps, and either simple or branched. Leaves opposite, narrow to somewhat oval-shaped, pinnately veined, with petioles, and with small sharp teeth on margins. Flowers clustered in globelike spikes subtended by sharptoothed overlapping bracts. Petals light blue to violet, tubular, strongly 2-lipped with notch in upper lip and 3 lobes in lower lip. Fruits are 4 nutlets that separate when ripe; each nutlet is about 1/16 inch (1.5 mm) long, brownish-black and granular in appearance, with a crescent-shaped scar on angular side at base. Found in meadows, fields, garden clearings, new woods, and wasteland, often on rocky or gravelly limy soils.