75b. Crataegus pruinosa (H. L. Wendland) K. Koch var. dissona (Sargent) Eggleston, Bull. New York State Mus. Nat. Hist. 254: 422. 1924.
Crataegus dissona Sargent, Rhodora 5: 60. 1903; C. brachypoda Sargent; C. disjuncta Sargent; C. pruinosa var. brachypoda (Sargent) E. J. Palmer; C. rigida Sargent
Shrubs, 20–40 dm. Leaves: blade trullate to ovate or ovate-oblong, 3–7 cm, length/width = 1.5, lobes 4 per side, lobe apex acute, base broadly cuneate to truncate, adaxial surface glabrous, sometimes sparsely appressed-hairy along veins. Inflorescence branches glabrous. Flowers 15–22 mm diam.; stamens 10, anthers bright rose to dull purple, sometimes cream. 2n = 51.
Flowering Apr–May; fruiting Sep–Nov. Brush and open woodlands; 20–300 m; Ont.; Conn., Ga., Ind., Ky., Mass., Mo., N.Y., Ohio, Wis.
Variety dissona, found from Missouri to Wisconsin and through the Great Lakes to New England, then south to Georgia, is widely scattered throughout the range of var. pruinosa and an unnamed southern form (see var. rugosa). Its detailed distribution is not well known but it is almost certainly more widespread than recorded. The variation in leaf shape of var. dissona closely parallels that of var. pruinosa. Crataegus disjuncta is a similar form with particularly large leaves; C. brachypoda has cream anthers.