208 ON THE GEOLOGY AND NATURAL HISTORY 
Eriogonum Jamesii, Benth. Sandhills. 
Eriogonum rotundifolium, Benth. Bad Lands of the Judith. 
Eriogonum brevicaule, var. lyptophyllum, Torr. Laramie mountains. 
Oxyria digyna, Campd. Black hills. 
LAURACE. 
Benzoin odoriferum, Nees. Woody bottoms along Missouri, below Niobrara. 
ELAEAGNACE®. 
Shepherdia argentea, Nutt. Very abundant from mouth of Big Sioux river to the 
mountains. It bears a profusion of red, acid fruit, called buffalo berries. 
Eleagnus argentea, Pursh. I have seen this shrub in but one locality in Missouri, 
near Fort Clark, on the high Tertiary hills, 
SANTALACE®. 
Comandra umbellata, Nutt. Fort Pierre and on the Yellowstone. 
EUPHORBIACE®. 
Euphorbia corollata, Linn. Quite common on Missouri to latitude 45°. 
Euphorbia marginata, Pursh. Very abundant to mountains. 
Euphorbia maculata, Linn. Same as last. 
Luphorbia polygonifolia, Linn. Along old roads, Upper Missouri. 
Euphorbia dictyosperma, Fisch & Mogq. Fort Pierre. 
Euphorbia glyptosperma, Engel. Common all over Western plains, 
Euphorbia inequilatera, Souder in Linnea. With the last. 
Euphorbia Geyeri, Engel. . Near mouth of Powder river, on Yellowstone. 
Euphorbia hypericifolia, Linn. Sandhills on Loup fork, also along Missouri, 
Luphorbia hexagona, Nutt. Sandhills of Loup fork, Niobrara. Abundant. 
Croton muricatum, Nutt. Sandhills. 
URTICACE®. 
Ulmus fulva, Michx. Abundant on the rich bottoms of Missouri to Big Sioux, and 
ceases to appear at the mouth of Niobrara river. 
Ulmus Americana, Linn. Along rivers and streams to mountains. 
Celtis occidentalis, Linn. Abundant near to N iobrara river, 
Morus rubra, Linn. Very abundant to mouth of 
small growth to the mountains, 
Urtica gracilis, Ait, Thickets and streams to Niobrara. 
Urtica Canadensis, Linn. Same as preceding, 
Parietaria Pennsylwanica, Mubl. Missouri and Yellowstone. 
Humulus Lupulus, Linn, Most abundant in the Upper Missouri country. 
Big Sioux ; seen sparingly, and of 
