ULMACEiE. 



SILVA OF NORTH AMERICA. 



m 



Celtis; tlie name given by Pliny to a species of Lotus^ was adopted by Tournef ort ^ and afterwards 

 by Linnseus for this genus. 



determ 



knots 



or distortions have frequently been found on Celtis in Kansas, Texas, not yet been satisfactorily 



Iowa, and Ohio, and occasionally in the eastern states. These un- trees cultivated in the streets of towns for shade and on those 



sightly distortions of the ends of the branches have been attributed growing in the forest. A black mould, Gyroceras Celtidis, Montagne 



to the action of a gall-mite, Phytoptus, but associated with it is a & Cesati, a native of Europe, has also been observed on the American 



fungus, Sphcerotheca phytoptophila, Kellerman & Swingle (Journal of species in some of the western states. Phleospora Celtidis^ Ellis & 



Mycology, iv. 93. — Trans. Kansas Acad.ScL xii. 101. — Kellerman, M.3xim, Phyllosticta Celtidis, Ellis & Kellerman, Ramularia Celtidis^ 



Rep. Kansas Experiment Station, i. 302, t. 4r-6. — Garden and Forest, Ellis & Kellerman, and Gloeosporium Celtidis, Ellis & Everhart, 



iii. 138); and whether the distortions are due entirely to the action produce spots on the leaves and are injurious parasites. 



of the insects or to the combined action of insects and fungi has 



1 Inst. 612, t, 383. 



CONSPECTUS OF THE NORTH AMERICAN ARBORESCENT SPECIES. 



EuCELTis, Pedicels ebracteolulate. Staminate flowers articulate, in few-flowered clusters, in 

 the axils of caducous bud-scales ; pistillate flowers usually solitary in the axils of lower leaves 

 of the year ; stigmas undivided ; leaves deciduous ; branchlets unarmed, marked with scat- 

 tered pale lenticels, and at the nodes with obscure ring-like stipular scars. 



Leaves ovate to ovate-lanceolate, sharply and coarsely serrate ; fruit large 1. Celtis occidentalis. 



Leaves ovate-lanceolate, ovate or oblong-lanceolate, entire or occasionally obscurely and 

 remotely serrate, thin or in one form subcoriaceous ; fruit small 



2. Celtis Mississippiensis 



