BLUESTEM PRICKLEPOPPY, Argemone intermedia Sweet. 1, plant in flower; 2, root system; 3, seed pod. Annual, reproducing by seed. Stems stout, prickly, not branched, 1 to 2 feet (30 to 60 cm) high. Leaves bluish-green with spiny margins and prickly surfaces, alternate, clasping the stern. Sap in stems and leaves orange-colored. Flowers large, white, 2 to 3 inches (5 to 7.5 cm) across, petals dropping off quickly. Seed pod oblong, about I inch (2.5 cm) in length, spiny, containing many seeds. Seeds globular, about 1/16 inch (1.5 mm) in diameter, dark brown, rough with narrow ridge along one side, short pointed tip on one end. Found on prairies and uncultivated areas. Plant is poisonous to cattle but they don't eat it because of its prickliness.