Pistils several, 1-ovuled, separately immersed in the obconical receptacle, which is much enlarged and broadly top-shaped at maturity, the imbedded nut-like fruits resembling small acorns.

Achenes somewhat obconical, hairy; pappus a single row of capillary bristles.—Flowers yellow.

A. dumòsus, L. Smooth or nearly so, 1–3° high; leaves linear or the upper oblong, crowded, entire, with rough margins; scales linear spatulate, obtuse, in 4–6 rows.—Thickets; common.—A variable species, loosely branched, with small leaves, especially the upper, and an obconical or bell-shaped involucre, with more abrupt green tips than any of the succeeding.

A large and tall tree, with thick bark; leaves ample, heart-shaped, long-acuminate; corolla 2´ long, nearly white, inconspicuously spotted, with obconical tube and slightly oblique limb, the lower lobe emarginate; capsule thick.—Low rich woodlands, S. Ind. to Tenn., Mo., and Ark. May.

As in previous families, but with flagellum surrounded by an obconical or cylindrical rim of cytoplasm, at the base of which is the ingestive area.