PLANTS OF ONEIDA COUNTY AND VICINITY. 181 



Five miles west of Rome, at the border of the swamp, beside the Water- 

 town railroad, along the base of a bank of excavation facing the north, on 

 damp sand, a form with long straight stems and large broad rigid sharply- 

 toothed spreading leaves ; abundant, though of recent appearance in 'this a 

 newly-made station. Rare. September, October. 



ANNOTINUM, L. Year-marked Lycopodium, 



Deep woods. Frequent, but more abundant on the hills. 



August, September. 



DENDROIDEUM, Mickaux. Tree-like Lycopodium. 



Sandy fields and woods. Common. August - November. 



CLAVATUM, L. Club-fruited Lycopodium, 



Barren, old open thicket- fields. Common. August - October. 



COMPLANATUM, L. Flattened-fronded Lycopodium. 



Sidehills, sandy or rocky openings. Common. September - November. 



SELAGINELLA, Beauvois. Selagiiiellas. 



RUPESTRis, Spring. Rock Selagiiiella. 



Dry open rocks. Littlefalls, north side of the river. Alexandria bay, Jef- 

 ferson county. Rare. August - October. 



APUS, Spring. Stemless Selaginella. 



Wet banks. Abundant round Cedar lake, Litchfield, south Herkimer county. 

 Sandy borders of swamps, Rome. Knieskern. About Salina, under the Solar 

 Salt-works. Scarce. August. 



MARSILEACE^. MarsUeads. 



ISOETES, L. Quillwort. 



LACUSTRis, L. Lake Isoetes. 



On rocks on the bottoms of rivers : New-York, in the Oswego river near the 

 the falls, V. v. Pursh. 



This plant was so named when all forms were considered the same, and 

 identical with I. lacustris of Europe. Among the species of our time, it must 

 belong either to /. echinospora or to I. braunii, Durieu; closely allied species, 

 the chief distinction being in the small needle-like projections of the spores, 

 which in the former are compressed, somewhat flattened and very fragile; 

 in the latter they are conoid and much firmer : both distinguished, by soft 

 light green or even yellow leaves which are gradually subulate, from /. 

 lacustris, whose leaves are dark green, rigid, and more linear throughout. 



Rare. August, September. 



AZOLLA, Lamarck. 



CAROLINIANA, Willdetum. Carolinian Azolla. 



Stagnant water and miry banks. In all the side-waters of Lake Ontario, 

 from the marshes five miles northeast of Oswego, to Braddock's bay, Monroe 

 county : often completely covering the water with a purple velvet mantle. 

 Common near the shore, but not observed at any distance from the Lake. 



August. 



