20 
North Carolina Experiment Station 
Associations. The two dominants are distributed in definite zones 
with the Abies highest. On the floor of the fir forest should he men¬ 
tioned the Hylocomium-Oxalis layer society. As successional associa¬ 
tions the Sambucus racemosus association and the Primus pennsylvanica 
association are prominent. 
Fig. 14. Pure stand of Abies Fraseri on summit of Clingman’s Dome in 
the Smoky Mountains 
BIBLIOGRAPHY 
Ashe, W. W. Loblolly or North Carolina pine. North Carolina Geol. and 
Econ. Surv. Bull. 24, 1915. 
Brown, William H. The Plant Life of Ellis, Great, Little and Long Lakes in 
North Carolina. Cont. U. S. Nat. Herb. 13: 323-341, 1911. 
Edson, Mrs. Helen R. Frost forms on Roan Mountain. Pop. Sci. No. 45: 
30, 1894. 
Harsiiberger, John W. An ecologic study of the flora of mountainous North 
Carolina. Bot. Gaz. 36: 241-258, 368-383, 1903. 
Lewis, J. F. The vegetation of Shackleford Bank. North Carolina Geol. and 
Econ. Surv. Paper 46, 1917. 
Kearney, T. H. The plant covering of Okracoke Island. A study in the 
ecology of the North Carolina strand vegetations. Contrib. U. S. Nat. 
Herb. 5: 261, 1900. 
. Report on a botanical survey of the Dismal Swamp 
region. Contrib. U. S. Nat. Herb. 5: 321, 1901. 
Mohr, Chas., and Roth Filibert. Timber pines of the Southern United States 
U. S. Dept, of Agr. Bull. 13 (Revised Ed.) Division of Forestry, 1897. 
Pinchot, Gifford, and Ashe, W. W. Timber trees and forests of North Caro¬ 
lina. North Carolina Geol. Surv. Bull. No. 6, 1-224, Pis. 1-23, 1897. 
