Its lemma have prominent lateral veins with papillose surface and acute apex. Its palea have dentated apex and papillose surface. "A. hispanicum" is a sprawling annual herbaceous plant high with opposite, papillose, succulent leaves. They have a band of papillose (or small hairs), along the mid-vein. The seed is ovoid to circular, compressed, with leathery, smooth or papillose seed coat. The ileocecal valve has a papillose structure. Its surface may be smooth, papillose, reticulate, tuberculate or longitudinally ribbed. The vertical seed is ovoid, somewhat flattened, reddish-magenta, with tubercular or papillose surface. The vertical seed is orange to red-brown, with slightly papillose seed coat. Papillose epidermis cells carpet the exterior of a plant, particularly the leaf. They have large, horizontal mouths, and their lips are very much papillose. Filaments filiform or slightly flattened, but sometimes papillose and rarely hairy ("F. karelinii"). The seed coat is crustaceous, mostly with papillose, conic outgrowths along one side. Adult males have papillose cloacal lips and a small mental gland. At the end cell, the lamella cross section is larger, ovoid and papillose.