Pyrus malus L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Widely spreading tree to 15 m; lvs elliptic to ovate, finely serrate, convolute in bud, permanently pubescent beneath; fls white, tinged with pink, 3 cm wide; hypanthium densely tomentose, open at the mouth; anthers yellow; cal persistent; fr globose or ovoid-globose, 6–12 cm; 2n=34. Eurasian cultigen, occasionally escaped. Probably hybridizes with native crab-apple.