OF THE UPPER MISSOURI. 207 
Sarcobatus vermicularis, Nees. This is one of the most abundant shrubs on the Upper 
Missouri. It makes its first appearance near latitude 44°, and seems to thrive 
best in the saline clays of the Cretaceous and Tertiary formations. It is some- 
times called “ grease-wood” by the traders, and is often used for fuel by them on 
the Yellowstone river, where it grows to the height of ten or twelve feet, with 
trunks two to three inches in diameter. On the Yellowstone and along the 
Missouri, it sometimes covers many square miles to the exclusion of other plants. 
Schoberia calceoliformis, Mog. Yellowstone. 
AMARANTHACEAE. 
Montelia tamariscina, Gray. Sandhills on Loup fork. 
Amaranthus albus, Linn. Sandy bottoms and shores of Missouri. 
Amaranthus retroflecus? Linn. Bad lands. 
Amaranthus hybridus. Fort Union. 
Amaranthus blitum. Fort Union. 
Frelichia Floridana, Mog. Sandhills. 
POLYGONACE. 
Ttumex altissimus, Wood. All along the Missouri to Bad Lands. 
Rumex maritimus, Linn. Along Missouri and Yellowstone. 
Lumex persicarioides, Linn. Sandy bottoms of Missouri. 
ftumex venosus, Pursh. Old Ponca village, Loup fork, 
Polygonum amphibium, Linn. Low wet places along the Missouri. 
Polygonum aviculare, Linn. Council bluffs, along the Missouri. 
Polygonum tenue, Michx. Council bluffs to mountains. 
Polygonum orientale, Linn. Council bluffs. 
Polygonum Pennsylvanicum, Linn. Bad Lands. 
Polygonum persicaria, Linn, Fort Sarpy on the Yellowstone. 
Polygonum ramosissimum, Michx. Bad Lands. 
Polygonum dumetorum, Linn. Council bluffs. 
Polygonum convolvulus, Linn. Black hills. 
Polygonum nodosum. Chardon’s creek in Blackfoot country. 
Eriogonum annuum, Nutt. Yellowstone and Bad Lands. 
Eriogonum flavum, Nutt. Bad Lands to Yellowstone. 
| Eriogonum gnaphaloides, Benth. On arid hills, Fort Union, and Bad Lands. 
Eriogonum alatum, Torr. Fort Laramie. 
Eriogonum aureum.. Shyenne river. 
Eriogonum umbellatum, Torr. Laramie mountains. 
Eriogonum effusum, Nutt. Platte valley. 
