1^0 JOURNAL OF THE ARNOLD ARBORETUM (vol. ii 



Juglans nigra L. Occasional in rich upland woods throughout, but 

 nowhere very common. Most trees large enough for commercial pur- 

 poses have been cut, the destruction being especially heavy since the 

 begimu'ng of the great war. It appears to be most abundant in the vi- 

 cinity of New Haven and Innum, in Gallatin County, and some good- 

 sized trees were seen there. 



Canja pecan (Wang.) Aschers. and Graebn. Common in alluvial bottoms 

 of streams from Cairo northward along tlie Mississippi Rivers and smaller 

 streams to beyond the limits of this exploration. Not found in the Ozark 

 Ridge Formation. 



Carya ovata (Mill.) K. Koch. More or less common throughout, ex- 

 cept in the low and swami)y i)arts of the Cairo Formation, but frequent 

 in the well-drained bottomlands. Most abundant and of the largest 



size in the Mounds Formation and along bluffs and in swales of the Ozark 

 region. 



Cnrija ovala var. NuttalUi Sarg. A large tree in upland woods of the 

 Ozark region. Observed in Johnson and Gallatin Counties. 



Carya orafa var. jmhescens Sarg. A rather common form on rocky 

 hills near Equality, Gallatin County, and doubtless occurring elsewhere 

 in tlH> Ozark Ridge Formation. 



Canja laciniosa (Michx. f.) Loud. Not unconunon throughout, in low 

 alluvial bottoms. Most abundant in the Cairo Formation. 



Carya alba (L.) K. Koch. Nowhere very common and a])parently 

 absent from the Cairo Formation; most abundant in the Ozark region. 



Carya glabra Sweet. Not common, but apparently most frequent in 

 the Ozark Ridge Formation. 



Carya glabra var. mcgacarpa? Sarg. Apparently this variety was col- 

 lected in upland woods in the Sliawneetown Hills, Mounds Formation 

 (No. 152G8). 



Carya oralis (Wang.) Sarg. Occasionally found in upland woods of 

 the Mounds and Ozark Ridge Formations. 



Carya oralis var. obcordata Sarg. Much more abundant than the last, 

 and one of the commonest Hickories in the Mounds and Ozark Ridge 

 Formations. It often attains a large size, up to 30 or 40 metres, and 

 with a straight symmetrical trunk. 



Carya oralis var. odorata Sarg. A rather uncc.mmon variety in dry 

 open woods of the Ozark region. 



Carya Buckley i var. arhinsana Sarg. Not connuon, and ap])arently 

 restricted to the rocky upland woods of the Ozark Ridge and northward, 

 near tlie ^Mississippi River. 



^ Curylus americana Walt. Very common in open woods of the Mounds 

 Formal ion; less abundant along small streams and rocky banks in the 

 Ozark region, and rarely growing on low knolls in th.e Cairo Formation. 

 Coryhis rostrata Ail. was not collected nor definitely noted in Southern 

 Illinois, but is not rare on knolls in low woods in Southeastern :Missouri, 

 and i)robal)Iy occurs in similar situations in the Cairo Formation uf Illinois' 



