APPENDIX. 



Isoetes riparia Engelm. River-bank Quilhvort. Andalusia, I. C. Martindale; Tully- 



town, Prof. L. M. Underwood. 

 Isoetes Dodgei A. A. Eaton. Dodge's Quilhvort. Point Pleasant, Dr. G. N. Best. 

 Isoetes Engelmanni A. Br. Engelmann's Quilhvort. Scllcrsville; Riegelsville, E. A. 



Rau. 

 Isoetes Engelmanni gracilis Eugehn. Slender Quilhvort. Sellersville. 



Siibkingdom SPERMATOPHYTA. 

 Class I. GYMNOSPERMAE. 

 Order i. PINALES. 

 Family i. Pinaceae Lindl. 



Pinus Strobus L. Whit.e Pine. A few stations. 



Pinus Virginiana Mill. Scrub Pine. Along the Delaware. 



Pinus rigida Mill. Pitch Pine. In rocky soil, not common. 



Tsuga Canadensis (L.) Carr. Hemlock. Sellersville; Bedminster; Nockamixon; 

 Neshaminy, Dr. E. Nevvlin Williams. 



Chamaecyparis thyoides (L.) B. S. P. Southern White Cedar. Bristol, I. C. Mar- 

 tindale. 

 . Juniperus communis L. Juniper. In upper and middle townships. 



Juniperus Virginiana L. Red Cedar. Common throughout. 



Family 2. Taxaceae Lindl. 



Taxus Canadensis Marsh. American Yew. Ground Hemlock. Nockamixon; Bed- 

 minster; Neshaminy, Doylestown, S. S. VanPelt. 



Class 2. ANGIOSPERMAE. 



Sub-class I. MONOCOTYLEDONES. 



Order I. PANDANALES. 



Family i. Typhaceae J. St. Hil. 



Tjrpha latifolia L. Broad-leaved Cat-tail. In marshes. 

 Typha angustifolia L. Narrow-leaved Cat-tail. In marshes. 



Family 2. Sparganiaceae Agardh. 



Sparganium eurycarpum Engelm. Large Bur-reed. In marshes. 



Sparganium androcladum (Engelm.) Morong. Branching Bur-reed. In shallow 

 water. 



Order 2. NAIADALES. 



Family i. Naiadaceae Lindl. 



Potamogeton natans L. Common Pondweed. In ponds and streams. 

 Potamogeton amplifolius Tuckerm. Large-leaved Pondweed. Argus; Sellersville. 



