204 JOrRXAL OF THE ARNOLD ARBORETUM [vol. ii 



angiistissima, * mexicana, nigra var. Lindheimeri, * oxylepis, * paradoxa 

 and var. * ajuscana, * Rowleei and var. * cana, * Schaffneri, taxifolia 

 and var. * microjjhylla. 



South America: S. Ilumboldtiana and var. * Martiana. 



Dahlem-Berlin, March, 1921. 



A LIST OF THE TREES OF LOUISIANA 



R. S. Cocks 



Professor of Botany, Tulane University, New Orleans 



This catalogue is based upon collections made by the writer during the 

 past fifteen or sixteen years. During that ])eriod every portion of the 

 State has been investigated and, with tlie exception of Crataegus, it is 

 believed the Ust is very nearly a complete one. Specimens of all tlie 

 trees listed arc in the Tulane Herbarium and in that of the Arnold Arbor- 

 etum. Professor Sargent who has accompanied me on many expeditions 

 in different parts of the State has revised the identifications, and I am 

 deeply indebted to him for liis interest and constant assistance. For 

 most trees the time of flowering and of the mature fruit has been given. 

 In the case of flowers this is subject to considerable variation, perhaps as 

 much as three weeks earlier and later in different years. This year, 19^1, 

 many trees were flowering in January which normally bloom In February 



or even in March. 



In West Feliciana Parish several trees probably attain their nuiximum 

 heights as shown by the following measurements carefully made by Mr. 

 Edward Butler of Catalpa in that Parish. 



Lirwdendron TuUpifera, height 181 feet; 

 Quercus alha, height 182 feet; girth 14>^ 



Vo feet. 



iformia, height 171 feet; girth 12J/^ fe* 

 \difolia var. caroliniajia, height 125)4 



inches. 



Ilex opaca, height 100 feet; girth 5 feet, 8 inches. 



Acer saccharum var. glaucum^ height 92 feet, 8 inches; girth 6 feet. 



Magnolia acwninata var. ludoiicianay heiglit 91 feet; girth 7 feet, 8 



inches. 



Magnolia grandijlora, height 147 feet; girth 12 feet. 



PINACEAE 



Pimis 'palusiris Mill. Pine flats: St. Tanunany, Tangipahoa, Beaure- 

 gard, Calcasieu and Allen Parishes. Pine hills: \Yashington, Tangi- 

 pahoa, St, Helena, Beauregard, AYinn, Grant, LaSalle and Natchitoches 



Parishes, 



Pinus echinata Mill. Mostly on uplands north of the Pinus paludris 

 region, between Ouachita River and the Texas border, and along the 

 Arkansas border. 



