Crataegus ferrissii Ashe, J. Elisha Mitchell Sci. Soc. 17: 11. 1901 (as ferrissi)

Leaf blades ovate to ovate-oblong, 3–6 cm, base rounded to subtruncate, sinuses deep (max LII 25–40%), proximal lobe most deeply separated, spreading at 60º–80º. Inflorescence branches glabrous. Flowers 15–20 mm diam. Pomes 9–12 mm diam.

Flowering May; fruiting Sep–Oct. Brush, field margins, woodland edges; of conservation concern; 300 m; Ill.

Variety ferrissii is a very distinct form from northern Illinois that has recently been rediscovered near Tinley Park; it should perhaps be referred to another species.