Erect annual herb to 1 m tall, sparsely branched; stems yellowish-green to brown, terete, finely striate, minutely puberulous. Leaves and many bracts of inflorescence opposite; blades of leaves papyraceous, rhombic, to 5 cm long, basal leaves to 3 cm wide, the margins crenulate above widest part, the apex broadly acute to slightly acuminate, the upper surface with coarse hairs, the lower