114 FLORA OE PHILADELPHIA. 



Camden— Camden (C). Gloucester— Sewell, Mullica Hill (C), near 

 Miokleton (He.), Swedesboro (Li.). Mercer — Princeton, Trenton (C). 

 New Castle— Mount Cuba (Le.). General, but not common. 



3. Corallorhiza Wistbriana Conrad. M. p. 305. Woods. Spring. 



Philadelphia— Wissahickon (Re.). Chester— (P.). Lancaster— (P.). 



4. Corallorhiza multiflora Nutt. M. p. 306. Woods. Summer. 



Philadelphia— Wissahickon (Re.). Bucks— Durham (Fr.). Montgom- 

 ery— Shannonville (Cr.), Bryn Mawr (Gi.), near Ardmore (Le.). Dela- 

 ware— Swarthmore (Pr.), Concord (W. Tr.). Chester— (P.). Lancaster 

 —York Furnace (Ja.) (Ke.) (Li.). Berks— Mount Neversink, Mart. (B. 

 C), Hamburg (Ke.). Lehigh— Woods near Geissinger 's, E. A. Bau (B. 

 C), Lehigh Mountain (Kr.). 



Camden— Camden (C). Hunterdon— Rosemont (C). 



New Castle— 'McCullovigh's, Canby. 



Subclass 2. DICOTYLEDONES. 



Series!. CIIORIPETALAE. 



Order 1. PIPERALES. 



Family 1. SAURURACEAE Lindl. Lizard's-tail Family. 



1. SAIJRURUS L. 



1. Saururus cbrnuus L. Lizard's Tail. M. p. 307. Swamps. Summer. 



Order 2. SALIOALES. 



Family 1. SALICACEAE Lindl. Willow Family. 



Bracts fimbriate or incised; stamens numerous. 1. Populus. 



Bracts entire; stamens 2-10. 2. Salix. 



1. POPULUS L. 



Petioles terete or channelled, scarcely or not at all flattened laterally. 



Leaves persistently and densely white-tomentose beneath, lobed or 



coarsely sinuate-dentate. 1. P. alba. 



Leaves glabrous or nearly so when mature, crenate. 



Foliage densely tomentose when young; capsule slender-pedicelled. 



2. P. heterophylla. 

 Foliage not tomentose; capsule short-pedicelled. 



3. P. candicans. 

 Petioles strongly flattened laterally. 



Leaves broadly deltoid, abruptly acuminate. 



Young leaves pubescent; capsule nearly sessile. 



4. P. nigra. 

 Young leaves not pubescent ; capsule slender-pedicelled. 



5. P. deltoides. 

 Leaves broadly ovate or suborbicular. 



Leaves coarsely sinuate-dentate. 6. P. grandidentata. 



Leaves crenulate-denticulate. 7. P. tremuloides. 



1. Populus alba L. White Poplar, Abele. M. p. 308. Occasionally spon- 

 taneous. Early spring. 



