168 



410. Asdepias tuhcrosa. Linn. Mouth Big Sioux, and in Platte 



valley. 



411 . Asdepias verticellata, Linn. Abundant on prairies ; Fort Pierre. 



412. Anantherix viridis, Nutt. Platte valley; Loup Fork; July 16. 



413. Acerates longi/olia, Nutt. Common around Fort Pierre. 



414. Acerates angusfifolia, Nutt. With preceding. 



415. Fraximis Americana, Linn. Generally diftused. 



416. Asarum Canadense, Linn. Near Council Blufts. 



417. Oxyhaphiis angustifolius, Torr. Dry hills around Fort Pierre. 



418. Chenopodium album, Linn. Platte valley; Fort Pierre. 



419. Ohione canescens, Moq. "Bad Lands;" common. 



420. Scdicornia herhacea, Linn. Saline places; Fort Union. 



421. Sa7xohatus 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 sometimes 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, Avith 

 trunks two to three inches in diameter. On the Yellow- 

 stone and along the Missouri it sometimes covers many 

 square miles to the exclusion of other plants. 



422. Amaranthiis cdb2is, Linn. Sandy bottoms and shores of Missouri. 



423. Rumex 2iersirarioides, Linn. Sandy bottoms of Missouri. 



424. Bumex venosus, Pursh. Old Ponca village ; Loup Fork. 



425. Polygonum amphibium, Linn. Low wet places along Missouri. 



426. Polygonum avicidare, Linn. Council Bluffs along Missouri. 



427. Polygonum tcnve, Michx. Council BluflFs to mountains. 



428. Benzoin odoriferum, Nees. Woody bottoms along Missouri, 



below Niobrara. 



429. Sliephcrdia argentco, Nutt. Very abundant from mouth of 



Big Sioux river to the mountains. It bears a profusion of 

 red acid fruit, called buffalo berries, 



430. Eleagnus argent ea, Pursh. I have seen this shrub in but one 



locality in Missouri, near Fort Clark, on the high tertiary 

 hills. ■ 



431. Comandra innbdlata, Nutt. Fort Pierre and on the Yellow- 



stone. 



432. Euplioi-bia corallata. Linn. Quite common on Missouri to lati- 



tude 45°. 



433. Eiiphorbia margimifa, Pursh. A'ery abundant to mountains. 



434. Euphorbia niaculata, Linn. Same as last. 



435. EujjJiorbia polygonifolia, Linn. Along old roads. Upper Mis- 



souri. 



436. Uhnusfulva, Michx. Abundant on the rich bottoms of Mis- 



souri to Big Sioux, and ceases to appear at the mouth of 

 Niobrara river. 



437. Ulmus Ameriranus, Linn. Along rivers and streams to moun- 



tains. 



438. Celtis occidentalis. Linn. Abundant near to Niobrara river. 



