Pyrus calleryana 'Glen's Form' is a deciduous ornamental tree with a narrow pyramidal crown, reaching 25-35 feet tall and 15 feet wide. Profuse creamy white flowers appear in early spring. Foliage is dark green and glossy in summer, turning an attractive purplish-red in fall.
"In 1917, seed [of Pyrus calleryana] was brought to the U.S. from China for hybridization experiments aimed at improving fireblight resistance for the common fruiting pear (P. communis). The experiments generally proved unsuccessful. In the 1950s, callery pear emerged in U.S. commerce as a promising new ornamental tree, leading to massive landscape plantings. By the 1980s, concerns about both overplanting and structural weakness (limb breakage from wind, ice and snow) began to surface. Today, additional concerns about invasiveness (non-sterile forms are escaping cultivation and naturalizing in some areas) are being addressed. ‘Chanticleer’ is considered to be one of the best of the cultivars currently available in commerce. Selected by Scanlon Nursery in 1959. U.S. Plant Patent PP2,489 issued March 23, 1965" (Missouri Botanical Garden Plant Finder). Chanticleer is a registered trademark and the correct cultivar name is 'Glen's Form.' This plant is also sold under the names Cleveland Select, Faurie, and Stonehill.