86 BOTANICAL GAZETTE. 



Polygonum Hartwrightii, Gray, is common in bogs. It has 

 flowered here but once in four years — the summer of 1880 — and I 

 was then so fortunate as to secure a good supply of specimens. 

 None of the plants matured fruit. 



Helianffylts Maximiliani, Schrad.is very common on the prairies 

 throughout this county. In grain fields it grows much larger, 

 and is almost as troublesome as H. rigidus, L. This locality, I be- 

 lieve, is the farthest north from which this species has been reported. 



Lespedeza leptosiqchya, Eng., is common on prairies. 



Luphanthus anisciius, Benth., is found in woods near Estherville. 



The peculiar Lygodesmia juneea, Don., I have found in a few 

 localities. It chooses the driest knolls, where it seems to lead a 

 precarious existence, so much so that I fear it will soon leave us 

 entirely. 



Liatris punctata, Hook., produces a large number of stems 

 from the same root; the outer ones generally being nearly prostrate. 

 It is only found on the driest knolls. 



Iva xanthiifolia, Nutt., has been introduced from the north- 

 west by cattle, and is becoming troublesome in some places. The 

 plant is an annual, and makes a very rapid growth, the main stem 

 often being over an inch in diameter, hollow, and very hard. 



< •alamagrostis stricta, Trim, occurs on wet prairies, a few culms 

 only in a place. 



Bouteloua ol igostachya, Torr., grows on dry, sandy ridges, along 

 with Carex sicccata, Dew., (Enothera serrulata, Nutt, an&Castilleia 

 sessiliflora, Pursh. 



In June, 1880, Senecio palustris, Hook., made its appearance 

 along the margin of one of our lakes, and also in wet ground near 

 the state line of Minnesota. The larger plants, with hollow stems 

 over an inch in diameter, grew about three feet high, and bore such 

 a' profusion of golden yellow blossoms that it was impossible to 

 press a whole plant in a specimen. Last season not a single speci- 

 men could be found, which makes me fear that it did not come to stay. 



Last- season while searching along the margin of a small lake 

 in the eastern part of this county, I came across a Potamogeton, 

 bearing an abundance of large floating leaves. I sent it to Rev. 

 Thomas Morong. of Ashland, Mass., who determined it to be P. II- 

 Unoensis, described and named by him in the Bot. Gaz., Vol. V, 

 page 50. It was first discovered by Mr. H. N. Patterson near 

 Oquawka, Ills., the only other locality known. 



In a large bog, three miles from my home, I have found, with- 

 in a radius of five rods, Salix ftiyrtilloides, L., Scheuchzeria palus- 

 tris, L., Potent iUa palustris, Scop., Triglochin maritimum, L., var. 

 '■latum, Gr., Eriophorum gracile. Koch., var. paucinervium, Eng., 

 and Carex chordorhiza, Ehrh. — R. J. Ceatty, Estherville, Emmet 

 Co., Iowa. 



Osmuncla dniiamomea, L. ? var. frondosa, Gray— I 



have had growing in my yard for a number of years (brought orig- 

 inally from Pennsylvania) a fine clump of Osmunda cinnamo- 



