The Flora of the Cayuga Lake Basin 135 



of the two species. In the low woods along the Clyde River southwest of Clyde, 

 many plants were found with glaucous leaves but with strongly fluted spathes the 

 edges of which were not conspicuously spreading at the summit. Two such plants 

 were found in dry sandy soil. With so many transitional forms occurring, it is 

 probably best to treat the plant as a variety of A. triphyllam. 



2. A. Dracontium (L.) Schott. Green Dragon. 



Banks and thickets, in low, very rich, black alluvial soil ; scarce. May 20- June 20. 



Inlet, near Lick Brook and at the mouth of Enfield Creek; "woods beyond Larch 

 Meadow" (D.) ; Negundo Woods (D.l) ; Renwick woods (D.\) ; Forest Home, 

 island; Cortland marl ponds; field near mouth of Paine Creek (D.) ; Lockwood 

 Flats (/. /. Thomas); Utt Point; Big Gully Point; Montezuma flats. 



N. E. to Minn., southw. to Fla., Kans., and Tex. ; rare on the Coastal Plain. A 

 plant of the rich soils of the interior. 



2. Peltandra Raf. 

 1. P. virginica (L.) Kunth. (P. undulata of Cayuga Fl.) Arrow Arum. 



Shallow water, in rich alluvial and mucky neutral or acid marshes and the borders 

 of swamps ; locally common. June-July. 



Inlet Marshes (D.l); points and bays along Cayuga Lake shore; Lake Como; 

 Cayuga Marshes (D.\) ; and elsewhere. 



S. Me. to Ont. and Mich., southw. to Fla., La., and Mo., including the Coastal 

 Plain. 



3. Symplocarpus Salisb. 



1. S. foetidus (L.) Nutt. Skunk Cabbage. 



Rich alluvial bottom-land woods and mucky swamps ; common, and generally dis- 

 tributed. Feb. 25-Apr. 



N. S. to Minn., southw. to N. C, (Fla., Smalt), and Iowa; less common on the 

 Coastal Plain. 



4. Calla L. 

 1. C. palustris L. Wild Calla. 



Wooded belts around acid peat bogs and boggy places, in soft muck and shallow 

 water ; infrequent. May-June. 



Michigan Hollow Swamp (D.l); West Danby ; w. of the Inlet (D.) ; Drydcn- 

 Lansing Swamp (D.) ; Freeville (D.) ; McLean Bogs; along railroad at Chicago 

 Crossing ; Lake Como ; Pout Pond ; Mud Pond «nd Duck Lake, Conquest. 



N. S. to Hudson Bay and Minn., southw. to n. N. J., Pa., Wis., and Iowa; rare or 

 absent on the Coastal Plain. Found also in Eurasia. 



5. Acorus L. 

 1. A. Calamus L. Sweet Flag. 



Springy meadows and borders of marshes, in rich wet, but not strongly calcareous, 

 soils ; common, and widely distributed. June. 



N. S. to Ont. and Minn., southw. to Fla. and Tex., including the Coastal Plain. 

 Found also in Eurasia. 



21. LEMNACEAE (Duckweed Family) 



a. Fronds with rootlets, flat, often branched. 



b. Rootlets several to each frond ; fronds 5-15-nerved, purple beneath. 



1. Spirodela 

 b. Rootlet solitary ; fronds obscurely 1— 5-nerved, green on both sides. 



2. Lemna 



a. Fronds without rootlets, thick, ovoid or lenticular, and very minute, less than 1.4 

 mm. long. 3. Wolffia 



