YELLOW TOADFLAX, Linaria vulgaris Hill. 1, entire plant; 2, single flower. Perennial, reproducing by seeds and rootstocks. Stems leafy, with very few branches, smooth, 1 to 2 feet (30 to 60 cm) tall, often in clumps, pale green. Leaves mostly alternate, narrow, smooth, pale green. Flowers snapdragonlike, about 1 inch (2.5 cm) long, bright yellow with deep orange center, in racemes at top of stems. Seeds dark brown or black, round, flattened, warty, numerous, in a 2-celled pod. Found in circular patches in native pastures, roadsides, and waste places, and along railroads. Sometimes cultivated in gardens, from which it escapes. Rather persistent under cultivation.