122 TREES AND SHRUBS. 



those of Quercus marilandica, and the oval or ovate acute leaves with undulate margins which appear to be common on 

 vigorous shoots of Quercus arkansana do not occur, so far as I have been able to observe, on the shoots of Quercus 

 marilandica, which on vigorous shoots sometimes produces oblong to obovate deeply lobed leaves. The leaves of Quer- 

 cus arkansana are without the short rufous hairs which are mixed with the stellate hairs on the young leaves and 

 branches of Quercus marilandica which, usually persistent during the season, give to the lower surface of the leaves of 

 this tree their peculiar orange-colored or brownish appearance. The acorn of the Fulton tree is ovate, much broader 

 than long, not oblong like that of Quercus marilandica, and the cup is more or less shallow with thinner more closely 

 appressed pubescent scales, the rim round the inner surface of the cup being formed by only a single row of scales with 

 no tendency to become reflexed or to form the thick rim which is one of the striking characters in the fruit of Quercus 

 marilandica. The fruit more closely resembles that of the Water Oak, Quercus nigra Linnseus, but the leaves are 

 different in shape and the Water Oak is without stellate hairs. 



A specimen with immature fruit collected by Mohr on July 4, 1880, on the wooded banks of the Conecuh River, 

 Conecuh County, Alabama, and considered by him a possible hybrid between Quercus nigra and Quercus marilandica, 

 judging by the shape of the leaves and the occasional stellate hairs on their lower surface, is perhaps Quercus arkansana. 

 This Oak is one of the most interesting of the numerous plants discovered by Mr. Bush in Missouri and Arkansas. 



C. S. S. 



EXPLANATION OF THE PLATE. 

 Plate CLII. Quercus arkansana. 



1. A flowering branch, natural size. 



2. A staminate flower, enlarged. 



3. A pistillate flower, enlarged. 



4. A fruiting branch, natural size. 



5. Part of a cup of the fruit, enlarged. 



6 and 7. Leaves from a sterile branch, natural size. 



8. Portion of a young leaf showing the staminate pubescence. 



