Sorbus 



ROSACEAE 



529 



50 



Map 1093 



Malus coronaria var. dasycalyx Rehd 



Malus 



(Wood) 



50 



Map 1094 



Britt. 



la. Malus coronaria var. dasycalyx Rehd. Map 1093. Rehder says this 

 variety also has the leaves paler beneath than the species. It occurs 

 throughout the state with the species. 



Ont. to Ohio and Ind. 



2. Malus ioensis (Wood) Britt. Prairie Crab. Map 1094. This is, for 

 the most part, a low, widely spreading tree which, according to specimens 

 seen, is restricted mostly to the western part of the state. 



Ind., Wis. to Minn., southw. to Mo. 



3338B. SORBUS [Tourn.] L. Mountain-ash 



[Jones. A synopsis of the North American species of Sorbus. Jour. 

 Arnold Arboretum 20: 1-43. 1939.] 



Winter buds glabrous on the back, the inner ones ciliate along the margins; branchlets 

 at flowering time glabrate 1. S. decora. 



Winter buds usually densely pubescent; branchlets at flowering time more or less 

 densely pubescent. (See excluded species no. 305, p. 1059.) S. Aucuparia. 



1. Sorbus decora (Sarg.) Schneid. Showy Mountain-ash. Map 1095. 

 The species of American mountain-ash have been poorly understood until 

 the recent synopsis appeared. Our native species resembles Sorbus Aucu- 

 paria, a European species, which has sparingly escaped in northern Indi- 

 ana. The European mountain-ash has been reported as only single speci- 

 mens except Nieuwland and Just (Amer. Midland Nat. 12: 221. 1930) 

 found two colonies of about 20 trees in a woods about 6 miles southwest 

 of South Bend and a single tree in a woods about two and a half miles 

 northeast of Walkerton. The tree at the last station named was about 

 five inches in diameter and approximately 35 feet high. They also report 

 that scattered about the tree were numerous seedlings. So7*bus decora was 

 first found in 1924 by Harold Orahood in a woods about a half mile north- 

 west of Union Mills, La Porte County. The tree he found was 9 and a half 

 inches in circumference at breast height and about 20 feet high. In 1933 



