50 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



[= Carya] aquaUca, "J." [= C] myristiccvformis^ Acer '■'• striatum'" [= A. 

 pennsylvanicum], Robiniapseudacacia, '' Cerasus^^ [= Primus] virginianus, 

 and Nyssa sylvatica. It is, therefore, very likely that several species are 

 to be added to those given in the ai^pended list, thus making an actual 

 total of nearly 100 species of trees which are native to the valley of the 

 lower Wabash. 



The most marked features of the woods in the region under consider- 

 ation, as compared with those of more eastern districts, are, (1) the entire 

 absence of coniferous trees, except in special and usually very restricted 

 localities, and (2) the great variety of species growing together. They 

 are emphatically "mixed woods," it being very rare indeed to find a 

 single species predominating over all others, though in limited sections 

 or particular localities one or another of the oaks (most frequently Q. 

 alba) J the Sugar Maple or Sweet Gum, may largely prevail; indeed, even 

 the Honey Locust and Catalpa have been noticed, in a single instance 

 each, to form the prevailing growth on a restricted area. Usually, 

 however, from 40 to 50 species of trees are mixed together indiscrimi- 

 nately upon an area approximating, say, 50 to 75 acres, the relative 

 abundance of the component species varying with the location, char- 

 acter of soil, geological formation, and other local causes. The two fol- 

 lowing lists, made on the spot, are given as typical : 



(1) Area, about 50 acres; situation, about 1^ miles west of Mount Carmcl, 

 Wabash County, Illinois, in bottoms of Greathouse CreeJc; date, September 

 10, 1876. 



1. Pawpaw, Asimina triloba. 



2. Silver Maple, Acer dasycarpum. 



3. Eed Maple, Acer ruhrum. 



4. Sugar Maple, Acer saccharimim. 



5. Honey Locust, Gleditschia triacanthos. 

 C. Coftee-bean, Gymnocladus canadensis. 



7. Eed-bud, Cercis canadensis. 



8. Wild Plum, Prunus virginiana. 



9. Wild Cherry, Prunus serotina. 



10. Crab Apple, Pirns coronaria. 



11. Cock-spur Thorn, Cratwgus crus-galli. 



12. "Red Haw", Crataegus (species undetermined). 



13. Sweet Gum, Liquidambar styraciflua. 



14. Flowering Dogwood, Cornus florida. 



15. "Black Gum", Kyssa {sylvatica f). 



16. Persimmon, Diospyros virginiana. 



17. \^\\\t(i Aiih, Fraxinus americana. 



18. Blue Ash, Fraxinus quadrangulata. 



19. Eed Ash, Fraxinus pubescens. 



20. Sassafras, Sassafras officinale. 

 JJlmns amcricana. 



