PLANTS OF MANHATTAN AND BLUE ISLAND 73 



species for Riley and Pottawatomie counties. The labels on these 

 specimens in the herbarium of the Kansas Agricultural College 

 do not show as a rule the exact locality. It is probable that they 

 fall in three groups which may be of more or less equal size: (1) 

 plants which the present writer did not recognize, (2) rare plants, 

 (3) plants collected outside of the area here covered. The present 

 list includes also about 25 additional species, about half of these 

 being additional for the State. 



PTERIDOPHYTA— Ferns and Fern Allies. 

 Ophioglossaceae. Adder's-tongue Family. 



Botrychium virginianum 1 (L.) Sw. Rattlesnake Fern. 

 Woods. Occasional. 



Polypodiaceae. Fern Family. 

 Pellea atropurpurea (L.) Link. Cliff-brake. 



On rocks in ravines and on hillsides. Frequent. 

 Filix gracilis (L.) Underw. Brittle Fern. 



On rocks on moist banks in ravines. Occasional. 

 Camptosorus rhizophyllus (L.) Link Walking Fern. 



Manhattan. Rare. In one ravine southeast of town. 



Marsileaceae. 



Marsilea vestiia Hook & Grev. 



Manhattan. Once collected in water in roadside ditch. 



Equisetaceae. Horsetail Family. 

 Equisetum arvense L. Field Horsetail. 



Wet banks. Occasional. 

 Equisetum hyemale L- Scouring Rush. 



Wet banks, low fields, etc. Common. 

 Equisetum laevigatum A. Br. 



Occasional at Manhattan. 



SPERMATOPHYTA. Seed Plants. 

 Pinaceae. Pine Family. 



Juniperus virginiana L. Red Cedar. 



Rocky banks and hillsides. Frequent. Also planted. Mar. 



*5- (i7)- 



1 Specific names have been decapitalized according to the rules now 

 most generally followed. 



