Crataegus improvisa Sargent

Leaf blades ovate, 4–7 cm, adaxial surface variably pubescent young. Inflorescence branches glabrous. Flowers: hypanthium glabrous.

Flowering May–Jun; fruiting Sep–Oct. Brush, roadsides, woodland edges; 50–400 m; N.B., N.S., Ont., Que.; Maine, Mass., Mich., N.Y., Vt., Wis.

Variety scabrida is widely spread through the range of Crataegus scabrida from Wisconsin to New England and Nova Scotia; it is nearly identical to C. brainerdii except for stamen number. Crataegus improvisa is a form with narrowly rhombic leaves.