165 [ 237 ] 



Tiitkum repetis, (Linn.) Grassy banks of Jacques river, &,c.; July 18. 



Triiicum cmiinum^ (Linn.) Prairies between James (Jacques) and Red 

 rivers ; July 23, 



Elymus Canadensis, (Linn.) Borders of woods, Devil's lake ; August 3. 



Elymiis. (or a new genus between elymus and hordeum.) Spikelets, two 

 at each joint of the rachis ; one of which is 2, the other 3 — 4 flowered; 

 involucre of 4 — 5 long setaceous glumes, which are entire ; or, more 

 commonly, very unequally 2-parted, (rather of 2 glumes united at the 

 base.) Perianth 2 valved ; valves lanceolate, scabrous ; inferior 

 3 awned at the summit ; the lateral awns ^— | the length of the 

 valve ; middle one very slender — six times the length of the valve ; 

 superior valve with 2 short awns at the summit ; culm about 15 

 inches high. Heavy ferruginous loam on the Missouri, Jacques, and 

 Shayen oju rivers; June 10. 



Atheropogon aphidoides. (Muhl. — Torr. Fl., 1., p. 139.) Prairies of the 

 Upper Mississippi, Devil's lake, (fee; July 2. 



Atheropogon oligostachyum, (Nutt. — Torr. in Sill. Jour., 4, p. 58.) High 

 prairies of the Missouri and Mississippi rivers ; June 2G. 



Sesleria dactyloides, (Nutt.) Hills and valleys of the Missouri; June 6. 



Leyiurus paniculattis, (Nutt.) Heavy ferruginous soil, valley of the Up- 

 per Missouri ; June 18. 



Crypsis squarrosa, (Nutt.) Sandy situations in the valley of the Missouri, 

 about Fort Pierre ; June 28. 



Beckmannia cruciformis, (Jacq.) Prairie swamps, near Jacques river; 

 July 6. 



Andropogo7i fnrcaius, (Muhl.) Swamps in prairies ; July 6. 



AndropogoJi scoparius, {blichx.) High prairies between the Missouri and 

 Mississippi rivers; July 12. 



FILICES. 



Slrulhiopteris Gerwjamca, (Willd.) Low woods on the Mankato river ; 



abundant ; September 20. 

 Polypodium vidgare, (Linn.) Rocks, Upper Mississippi ; October 18. 

 Asplenium rhizophyllmn. (Linn.) With the preceding. 



MARSILIACEiE. 



Marsilca vestita, (Hook, and Grev., i. c. fil. t. 159.) Dry swamps in the 

 prairies near Devil's lake ; June 24. 



EQUISETACE^. 



Equisetum hyemale. (Linn.) Low woods, banks of the Missouri and 

 Upper Mississippi, May 21. Very large specimens, broken oflf at the 

 top, and bearing a pair of small heads of fructification at two of the 

 upper joints. 



In the collection of Mr. Geyer, there were a very few specimens belong, 

 ing to the lower orders of the cryptogamia, which I have not determined. 

 They belong to the genera hypurea agaricus, (three or four species,) 

 hydrum, boletus, phellus, and chara. 



