132 EIGHTEENTH ANNUAL REPORT ON THE STATE CABINET. 



SIMPLEX, Hudson Single-headed Sparganium 



Margins of ponds, lakes. Frequent. July. 



NATANs, L. Floating Sparganium. 



Slow-flowing brooks. On the flats of the Mohawk, a mile or two below Utica. 



Rare. July. 



ANGUSTIFOLIUM, Michx. Narrow-leaved Sparganium. 



Margins of cold springs and high ponds in the northern part of Herkimer 

 county. Rare. July. 



LEMNACE^. Duckmeats.. 



LEMNA, L. 



TRisuLCA, L. Ivy-leaved, Three-parted Lemna. 



Still water. Pond on the flats below Utica. Alexandria bay. Gates, Monroe 

 county, found in tiower by CM. Booth. Uncommon. June. 



MINOR, L. Little Lemna, 



Stagnant water. Common. 



POLYRRHIZA, L. Many-Tooted Lemna. 



Ponds. Frequent. 



GIBBA, L. Convex-leaved Lemna. 



Ditches and stagnant waters; observed in flower, near Liverpool in the wes- 

 tern part of New- York State, Fursh. Onondaga lake. Rare. 



NAJADACE^. JYajads. 



NAJAS, L. 



MAJOR, Allioni. Greater Najas. 



Borders of Onondaga lake. Discovered by G. "W. Clinton, in October 1864, 

 gi'owing in a stream emptying into the lake near Liverpool, 



It abounds, however, in the lake, in water ten to twenty-five feet deep; 

 most luxuriantly along the edge of a sudden descent of the bottom, at a 

 distance from shore. When the water is clear and still, the plants can be seen 

 growing on the bottom, branching in all directions from the root. But the 

 best specimens come from the deepest water, out of sight; some clusters of 

 which are three feet in length, and these only fragments broken off by storms. 



At least three forms occur. The common one is entirely unarmed, without 

 spines either on stems or leaves; perhaps the var. angustifolia, Braun, ob- 

 served by Chamisso at Oahu, Sandwicb Islands. 



Another corresponds with the normal form described by Prof. Alexander 

 Braijn : Stem sparing!}^ beset with spines (10-40 in each internode) ; leaves 

 broad-linear, each edge of the blade with 4-8 teeth, which are patent and 

 not quite so long as the leaf is broad, the leaf at the back furnished with 

 1-4 spines; sheath of leaf with rounded lateral edges, and without teeth; 

 fruit 5-8 millimetres long. — Florida, Cabanis. 



A small form occasionally appears, about half the size of the first in all 

 the parts and fruit. 



The above habitats, with our own, are the only stations of this plant known 

 on the American continents : it is widely distributed over the Old world. 



Local. August - November. 



FLExiLis, Rostkov ^ Schmidt. Bending Najas. 



Lakes, rivers. Outlet of Canaderaga lake, Otsego county. Lake Ontario. 

 Cape Vincent, head of the St. Lawrence, Bradley. Abundant in the river 

 south of Oswego. Crooked lake, Sartwell. Infrequent. July - September. 



