Annuals, 80-120 cm (taproots surrounded by fibrous roots). Herbage glabrous or sparsely hairy. Stems single. Leaves evenly distributed; petiolate; blades ovate, 12-24 × 8-12 cm, bases tapered or contracted, margins wavy and dentate to denticulate (mid leaves sessile, ovate to broadly lanceolate, nearly as large as basal and proximal; distal sessile, lanceolate to linear-lanceolate, becoming bractlike). Heads 20-40+ in corymbiform arrays or cymiform clusters. Calyculi of 2-7 bractlets (1-3 mm). Phyllaries ± 13, 7-9 mm, tips green to grayish. Ray florets ± 8; corolla laminae 7-10 mm. Cypselae hirtellous.

Flowering spring. Open, disturbed sites, especially roadsides; of conservation concern; 200-400 m; Tex.

Senecio quaylei resembles S. ampullaceus; it is more robust and glabrous, and has prominently clasping mid-cauline leaves. The size and robustness suggest that it may be a polyploid derivative of S. ampullaceus.