530 



ROSACEAE 



Aronia 



50 



Map 1095 

 Sorbus decora ISarqJ Schneid. 



I found a tree on the border of a swamp in Pokagon State Park, Steuben 

 County, that was I6V2 inches in circumference and about 25 feet high. 

 Newf. to Minn., southw. to N. Y. and Iowa. 



3338C. ARONIA Medic. Chokeberry 



Branchlets, lower surface of leaves, pedicels, and exterior of calyx glabrous or nearly 

 so at flowering time, entirely glabrous at maturity 1. A. melanocarpa. 



Branchlets, lower surface of leaves, pedicels, and exterior of calyx more or less densely 

 pubescent at flowering time, remaining pubescent until maturity or some parts 

 becoming glabrous but pubescence evident on the remaining parts, the branchlets 

 always showing hairs on some parts 2. A. p-runifolia. 



1. Aronia melanocarpa (Michx.) Ell. (Pyrus melanocarpa (Michx.) 

 Willd. and Aronia melanocarpa (Michx.) Britt.) Black Chokeberry. 

 Map 1096. This species, like the next one, grows only in slightly acid 

 soil. In the lake area it grows in moist, sandy woods and tamarack bogs 

 and on the borders of lakes ; in the southern part of the state it grows in 

 moist or wet, hard clay soil and on the exposed parts of sandstone cliffs. 

 It is not frequent but common where it is found in the north, and rare to 

 very rare in the south where there are generally only a few plants in a 

 place or in very small colonies. It is usually 2-5 feet high. 



N. S. to Mich., southw. to Fla. 



2. Aronia prunifolia (Marsh.) Render. (Jour. Arnold Arboretum 19: 

 74. 1938.) (Aronia floribunda (Lindl.) Spach, Pyrus arbutifolia var. atro- 

 purpurea (Britt.) Rob., and Aronia atropurpurea Britt.) Teuscher dis- 

 cusses the status of this species in Torreya 33: 22-24. 1933. Purple 

 Chokeberry. Map 1097. Infrequent to local in the lake area and very 

 local south of it. It is generally 3-9 feet high and grows in old tamarack 

 bogs, swamps, and low woods. In a few places I have found it forming a 

 dense and nearly pure stand over an acre or more and growing to a 

 height of 6-8 feet. 



