YELLOW HAWKWEED, Hieracium pratense Tausch. 1, entire plant; 2, seed. Perennial, reproducing by seeds, by slender rhizomes, and by occasional stolons that develop late in summer. Stems 6 inches to 3 feet (15 to 90 cm) tall, coarse, hairy, containing milky juice; upper parts with blackish, gland-tipped hairs. Leaves simple, without petioles, about 10 inches (25 cm) long, spatula-shaped, with bristles on both surfaces. Usually they grow from the base of the stem, although 1 to 3 well-developed leaves are borne higher on the stem. Flower heads each have 12 or more yellow flowers. Fruits 1-seeded (achenes), about 1/16 inch (1.5 mm) long, dark brown or black, and cylindrical with vertical ridges. Found in clearings, meadows, pastures, grasslands, and old fields on dry, gravelly, and somewhat acid soil.