APPENDIX. 21 



Order 2. SALICALES. 

 Family i. Salicaceac Lindl. 



Populus candicans Ait. Balm of Gilead. Bedminstcr, Argus. 



Populus dilatata Ait. Lombardy Poplar. Rockhill towsnhip. 



Populus grandidentata Michx. Large-toothed Aspen. Sellersville; Pcrkasie; Rock- 

 hill, Alexander MacElwee. 



Populus tremuloides Michx. American Aspen. Sellersville; Argus; Mechanicsville, 

 Dr. E. Newlin Williams. 



Salix nigra Marsh. Black Willow. Along streams and lakes. 



Salix lucida Muhl. Shining Willow. Bensalem, I. C. Martindale. 



Salix fragilis L. Brittle Willow. Escaped from cultivation. 



Salix alba L. White Willow. Along streams. 



Salix alba vitellina (L.) Koch. Golden Osier. Along streams. 



Salix Babylonica L. Weeping Willow. Spontaneous in a few places. 



Salix cordata Muhl. Heart-leaved Willow. Point Pleasant, (M. C). 



Salix fluviatilis Nutt. River-bank Willow. Islands of the Delaware, in the upper 

 end, CM. C). 



Salix petiolaris J. E. Smith. Slender Willow. In swamps. 



Salix discolor Muhl. Glaucous Willow. Pussy Willow. On moist hillsides. 



Salix Bebbiana Sarg. Bebb's Willow. Near Point Pleasant, (M. C); Perkasie. 



Salix humilis Marsh. Prairie Willow. In dry soil. 



Salix tristis Ait. Sage Willow. Dwarf Gray Willow. In dry soil. 



Salix sericea Marsh. Silky WiHow. In swamps and along streams. 



Salix purpurea L. Purple Willow. Bensalem, I. C. Martindale. 



Order 3. MYRICALES. 

 Family i. Alyricaceae Dumort. 

 Comptonia peregrina (L.) Coulter. Sweet Fern. In dry soil. A few stations. 



Order 4. JUGLANDALES. 

 Family i. Juglandaceae Lindl. 



Juglans nigra L. Black Walnut. In rich woods. 



Juglans cinerea L. Butternut. White Walnut. In rich or rocky woods. 



Hicoria minima (Marsh.) Britton. Bitter-nut. In moist woods. 



Hicoria ovata (Mill.) Britton. Shell-bark Hickory. In rich soil. 



Hicoria laciniosa (Michx. f.) Sarg. King-nut. Bull-nut. Near Pipersville; Ridge 



Valley. 

 Hicoria alba (L.) Britton. Mocker-nut. In rich soil. 

 Hicoria glabra (Mill.) Britton. Pig-nut. In dry or moist woods. 



Order 5. FAGALES. 

 Family i. Betnlaceae Agardh. 



Carpinus Caroliniana Walt. American Hornbeam. Blue Beech. In moist woods 

 and along streams. 



