OF THE UPPER MISSOURI. 201 
Pentstemon erianthum, Nutt. Hills around Fort Pierre. 
Pentstemon albidum, Nutt. Low with glabrous calyx. Hills around Fort Pierre. 
Pentstemon cristatum, Nutt. On high prairies; Upper Missouri. 
Fentstemon gracile, Nutt. Prairie bottoms, near Fort Pierre. 
Pentstemon pubescens, Solander. Fort Pierre ; June. 
Pentstemon levigatus, Solander. Fort Leavenworth; May. 
Pentstemon acuminatus, Lindl. Sandhills on Loup fork. 
Pentstemon Fendleri, Gray. Sandhills on Loup fork. 
Pentstemon confertus, Lindl. Laramie mountains, August 24th. 
Pentstemon ? undetermined. Niobrara. 
Mimulus ringens, Linn. Council bluffs and Big Sioux. 
Mimulus Jamesii, Torr. On the Platte. Dr. Cooper. 
Gratiola Virginica, Linn. Quite common along the Missouri. 
Veronica anagallis, Linn. Common; Council bluffs. 
Veronica scutellata, Linn. With the preceding. 
Veronica peregrina, Linn. Fort Pierre. 
Veronica Americana, Schwein. Niobrara river. 
Veronica arvensis, Linn. Council bluffs to Bad Lands. 
LIlysanthes gratioloides, Benth. Yellowstone country. 
Limosella aquatica, Linn. Wet places on the banks of the Yellowstone. ‘This is the 
same as the European plant. 
Synthyris Houghtoniana, Benth. Black hills. 
Gerardia purpurea, Linn. Council bluffs. 
Gerardia tenuifolia, Vahl. Fort Pierre. 
Castilleia sessiliflora, Pursh. Fort Pierre, Bad Lands, Yellowstone, &c. 
Castilleia septentrionalis, Lindl, Black hills. 
Custilleia linariafolia, Benth. Laramie mountains, August 24th. 
Castilleia argutifolia, Nutt. Laramie mountains. 
Melampyrum Americanum, Michx. Extends up the Missouri as far as the mouth of 
the Platte. 
Pedicularis lanceolata, Michx. Fort Pierre, Yellowstone, &c. 
Orthocarpus luteus. Near Powder river on Yellowstone. 
ACANTHACE. 
Dipteracanthus strepens, Nees. Fort Leavenworth to mouth of Niobrara river. 
Dianthera Americana, Linn. Platte valley. 
VERBENACE. 
Verbena urticifolia, Linn. Dixon’s bluffs, on Missouri. 
VOL. XIt.—26 
