1921] PALMER, BOTANICAL RECONNAISSANCE OF SOUTHERN ILLINOIS 147 



Crataegus pkaenopyrum Med. Observed in swales and hollows of the 

 Gold Hills, near Shawneetown, Gallatin County, and in open upland 

 woods near Elizabethtow^n, Hardin County. — Besides the species of 

 Crataegus listed above nineteen others w^ere collected in the region, dis- 

 tributed as follows in the different groups: Crus-galli 7, Punctatae 2, 

 Virides 3, Pruinosae 1, Tomentosae 4, Molles 1, and Intricatae 1. Doubt- 

 less several others occur, especially in the vicinity of the Ohio River, 

 where thorns are very abundant on the limestone hills of Pope and Hardin 



Counties, and northward. 



Prunus serotina Ehrh. More or less frequent throughout, except in 

 the lowlands of the Cairo Formation. Most abundant in the Mounds 



Formation. 



Prunus angustifolia Marsh. Growing in small thickets in various parts 

 of the region, but nowhere common. Observed in Alexander, Johnson, 



Hardin and Gallatin Counties. 



Prunus Munsoniana Wight & Hedrick. One of the commonest wild 

 Plums, and found throughout in open ground and borders of woods. 



Prunus hortulana Bailey. Found throughout the region along small 

 streams and in open woods, but nowhere very common. 



Prunus amerlcana Marsh, Most abundant in the limestone areas of 

 Pope and Hardin Counties, and frequently found throughout the Ozark 



region and northward. 



Prunus lanata Wats. This Plum is uncommon in the Ozark Ridge and 

 Mounds Formations. It was observed near Shawneetown, Gallatin County, 

 in the Gold Hills, and also near Columbus, Kentucky, where it had the 

 large, rugose leaves of P. mexicana Wats, that characterize that species in 



Gulf Coastal plain region. 



Rosa setigera Michx. This form, with glabrous foliage, is much less 

 common than the last, but is occasionally found in low woods and thick- 

 ets, especially in the southern part of the region. 



Rosa setigera var. tomentosa Torr. & Gr. Rather common through- 

 out in thickets and open ground, especially in the northern portions. 

 This is the common trailing or climbing Rose of the Mississippi Valley. 



Rosa palustris Marsh, Common in swamps of the Cairo Formation, 

 where it often grows on rotting logs. It is also very abundant in swales 

 of flat, poorly drained prairies in Richland County. 



Rosa dasistema Raf. Growing with the last in swamps of the Cairo 



region. 



Rosa Carolina L. The common low growing Rose, and found through- 

 out except in the lowlands of the Cairo area. This is Rosa humilis Marsh. 



Rosa rudiuscula Greene. What appears to be this species is occa- 

 sionally found in open rocky ground in the Ozark Ridge and northward, 

 but it is nowhere very common. 



Rosa ruhiginosa L. is an occasional escape near towns and dwellings, 

 and is well established and abundant in a section of the Gold Hills, near 

 Shawneetown, Gallatin County. 



