Professor Sprenger Crabapple - Malus 'Professor Sprenger'
Family Rosaceae - Rose Family; Fruit Trees

Professor Sprenger crabapple is cited as one variety resistent to apple scab [4]
Professor Sprenger Crabapple blossoms
Professor Sprenger, I presume? This lovely crab offers attractive dark green  foliage and red buds opening into stunning white blossoms, all wrapped up in an open-crowned form. Outstanding 1/2" orange fruit add winter interest and food for wildlife (probably some for your patio, too, if you or your contractor planted too close to the house, that dummy.

There are about 55 different species in the genus Malus, and there are innumerable cultivars available in the landscape trade. The Morton Arboretum's Crabapple Collection was started in 1924. Part of this collection on the West Side participated in the National Crabapple Evaluation Program which evaluated new and disease-resistant varieties. As a result of the multi-year evaluation and additions, it has transformed into the West Side Malus collection which now contains 60 different kinds and over 140 specimens with highly desirable qualities. 

Some of the specimens in this collection are almost large enough to be considered shade trees, while others are quite small. There is a great variety of shape as well, from wide to upright and narrow, weeping, and multi-stemmed. There is variety in flower color, ranging from white to pink, red, purple, and crimson. Some flower buds will be one color, and then open up to a completely different color! Fruits range in size from smaller than a pea, to nearly the size of most apples; they can be red, purple, orange, yellow, or green. Some of the smaller fruits persist on the tree throughout winter, providing a splash of color in the cold months. [1]

Professor Sprenger Crabapple
Professor Sprenger Crabapple, from a planting, is 11 years old. [2]  
Most Morton Arboretum crabapples are planted in threes - I like to call them triumvirates, and I always think of them as females. I'll revisit in a few years and see how they are doing. I've had the most fun shooting trees, especially crabapples, at the Morton.  Crabapple Lake in the springtime is not to be missed!
References
1. Morton Arboretum, Crabapple: A Tree For All Seasons
2. Professor Sprenger Crabapple, Morton Arboretum acc. 363-98*1, photos: Bruce J. Marlin
3. Morton Arboretum, Crabapples for the Home Landscape
4. Morton Arboretum, Plant Health Care Report, Issue 2009.07, May 22- May 28, 2009
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Family Rosaceae - Rose Family; Fruit Trees
Containing Hawthorns, Apples, Pears, Cherries, Plums, Peach, Almond, Mountain-Ash and Whitebeam. Rosaceae is a large family of plants with about 3,000 species in ~100 genera. Crabapple and other fruit trees provide some of our most outstanding flowering ornamentals.
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