The Flora of the Cayuga Lake Basin 291 



E. Que. to Out. and S. Dak., southw. to Ga., Ind., and Miss., but rare on the 

 Coastal Plain. 



R. hirta (L.) Sud., an earlier name, was based on an abnormal or monstrous 

 form of the species, and therefore is not valid. 



2. R. glabra L. (Including R. ithacensis Greene.) Smooth Sumach. 



Dry sandy and gravelly banks, in more sterile and acid soils than the preceding ; 

 frequent. July 10-30. 



Coy Glen; South Hill, near the chain works; Six Mile Creek, near the pump- 

 ing station; Ithaca flats, near the Cornell boathouse; "abundant on shore of 

 Cayuga Lake" (D.) ; Big Gully; and elsewhere. Not found in Cortland Co. or in 

 the McLean region. 



N. S. to Minn, and B. C, southw. to Fla., Miss., and La. ; more frequent than 

 R. typhina on the Atlantic Coastal Plain, but less common there than elsewhere. 



3. R. Vernix L. (R. venenata of Cayuga Fl.) Poison Sumach. Poison Dogwood. 



Poison Elder. 



Boggy acid soils ; frequent. June 25-July 20. 



Headwaters Swamp ; Michigan Hollow Swamp ; Larch Meadow ; Indian Spring 

 marsh (D. !) ; Ringwood ; McLean Bogs; Junius bogs. 



W. Me. to w. Ont. and Minn., southw. to Fla., La., and Mo. ; common on the 

 Coastal Plain. 



4. R. Toxicodendron L. (Including R. radicans L.) Poison Ivy. Poison Oak. 

 Fence rows, rocky banks, and often in alluvial woodlands, in dry or damp, 



sandy or gravelly, noncalcareous soils ; common. June 15-July 15. 



N. S. to the Rocky Mts., southw. to Fla., Tex., and Mex., including the Atlantic 

 Coastal Plain. 



Very variable in habit and habitat. The high-climbing form of low woodlands 

 has been separated from the erect form on walls and rocks as var. radicans (L.) 

 Torr., but an investigation of a large amount of material has shown no constant 

 structural differences. Both forms are variable as to pubescence and as to denta- 

 tion of the leaf. 



5. R. canadensis Marsh. (R. aromatica of Cayuga Fl.) Aromatic Sumach. 



Dry rocky banks with clay, over noncalcareous sandstones ; frequent. May. 



"High 'Pinnacles' at West Danby and White Church" (D.l); Buttermilk Glen; 

 n. e. slope of South Hill (D.l) ; Six Mile Creek (D.l); Fall Creek, near Trip- 

 hammer Falls (D.) and near the mills; in other ravines of the basin (D.l) ; 

 especially abundant on the e. shore of Cayuga Lake (D.\). 



W. Vt. to Minn., southw. along the mts. to Fla., and to La. and Kans. ; rare or 

 absent on the Coastal Plain. 



77. AQUIFOLIACEAE (Holly Family) 



a. Leaves serrate; petals oval; stamens adnate to base of corolla. 1. Ilex 



a. Leaves entire; petals linear; stamens free from the corolla. 2. Nemopanthus 



1. Ilex L. 

 1. I. verticillata (L.) Gray. Winterberry. Black Alder. Deciduous Holly. 



Swampy woods and thickets, in acid soils ; frequent. July. 



Summit Marsh ; swamp n. of Enfield Falls ; South Hill Marsh ; Indian Spring 

 marsh (D.l); Ringwood; Malloryville ; McLean Bogs; Lake Como; Junius bogs; 

 Montezuma Marshes ; Duck Lake ; Stark Pond ; and elsewhere. Especially frequent 

 about peat bogs. 



