Family, Composite. Color, blue. Leaves, various; those from the root arrow - shape or lobed at base; those on stem contracted into a winged petiole, all lance-shape or ovate, dentate with sharp teeth, 4 to 6 inches long. Heads of flowers on scaly peduncles. Stem, 3 to 6 feet high, leafy, terminated with a loose panicle of numerous flowers.
Plants of this genus have milky juice; hence the name "lettuce," from lac, meaning milk. All are tall and leafy, with cream-colored or purplish flowers, not unlike the genus Prenanthes.
Family, Composite. Color, white or purplish. (See White Flowers, p. 146.)