146 JOURNAL OF THE ARNOLD ARBORETUM (vol. ii 



Ruhus alleghanicnsis Porter. This ai)pears lo be the common higli 

 Bkickberry of southern IlUnois, and i? rather common in open ground 

 throughout. 



Rubus canadensis L. Found in the Ozark Ridge and Mounds For- 

 mations, generally on open rocky hillsides or in well-drained open ground. 



Rubus inllosus Ait. What appears to be this species is found occa- 

 sionally in open ground north of the Cairo region. 



Rubus riibrisdus Rydb. Often abundant in low open woods and swamjjs 

 in the Cairo region, to which it seems mainly confined. 



A Rubus perhaps representing another species is frequent in deep 

 swamps of the Cairo Formation, often growing upon rotten logs with 

 Itca virgin ica, Rosa palustris and a few other typical swamp plants. (Num- 

 ber 14949, Olive Branch, represents this form.) In low open ground 

 near Cairo another Rubus was seen, which appeared to be distinct from 

 any of those mentioned above. This is a low, mainly prostrate plant, 

 with greenish, angular, rigid canes, and short stout prickles. As it was 

 neither in flower nor fruit when found no specimens were made. 



Crataegus crus-galli? L. Apparently this species is found as a small 

 tree near the Ohio River, in Pope, Hardin and Gallatin Comities. 



Crataegus Engelmannii Sarg. Common in thickets and open woods, 

 on rocky hillsides and uplands in Pope and ITardin Counties. 



Crataegus pratensis Sarg. Small trees doubtfully referred to this spe- 

 cies were found in open rocky woods above the Ohio River, near Rosi- 

 clair, Hardin County. 



Crataegus Jecunda? Sarg. A small tree 5 or 6 metres tall, growing 

 in open woods, in the Gold Hills, near Shawneetown, Gallatin County. 



Crataegus punctata? Jacq. Trees, sometimes 8 or 9 metres tall, with 

 slender clear trunks and small crowns of horizontal or wide-spreading 

 branches; growing in rich upper bottoms of the Cairo Formation, and 

 along small streams in the Ozark Ridge region. 



Crataegus viridis L. This is one of the commonest species in the swami)s 

 and low wet woods of the Cairo Formation, and it is not infrequent in 

 low bottom lands of streams throughout. 



Crataegus pruinosa? (Wcndl.) K. Koch. A small tree, or sometimes 

 shrubby, on the limestone hills of Pope and Hardin Counties, and through- 

 out the Ozark region and northward. 



Crataegus mollis (T. & G.) Scheele. Abundant in low alluvial ground 

 and in the upper bottoms of the Cairo Formation, and more or less fre- 

 quent along streams throughout the region. Sometimes a large tree for 

 the group. 



Crataegus coccinioides Ashe. Frequent in open woods and glades through- 

 out the Ozark region and northward. 



Crataegus tovientosa? L. Slender trees up to 5 or 6 metres tall, in low 

 open woods. Collected near Carbondale, Jackson County, and doubt- 

 less growing elsewhere in the Ozark Ridge region. 



