APPENDIX. 23 



Parietaria Pennsylvanica Muhl. Pennsylvania rdlitory. Scllersville; Nockamixon, 

 Ur. T. C. Porter. 



Order J- SANTALALES. 



Family i. Santalaceae R. Br. 

 Comandra umbellata {L.) Nutt. Bastard Toad-flax. In dry fields. 



Order 8. ARISTOLOCHIALES. 



Family i. Aristolochiaceae Blnme. 



Asarum Canadensc L Wild Ginger. In rich woods. 



Asarum reflexum Hickncll. Short-lobed Wild Ginger. Ridge Valley. 



Aristolochia Serpentaria L. Virginia Snakeroot. In dry, rich woods. 



Order 9. POLYGONALES. 

 Family i. Polygonaceae Lindl. 



Rumex Acetosella L. Sheep Sorrel. In dry fields. 



Rumcx Hydrolapathum Huds. English Dock. In waste grounds, Sellersville 

 Rumex crispus L. Curled Dock. In fields and wasts places. 

 Rumex sanguineus L. Red-veined Dock. Near Sellersville. 

 Rumex obtusifolius L. Bitter Dock. In waste places. 

 Fagopyrum Fagopyrum (L.) Karst. Buckwheat. In waste places. 

 Polygonum emersum (Michx.) Britton. Swamp Persicaria. In moist soil. 

 Polygonum Pennsylvanicum L. Pennsylvania Persicaria. In waste grounds. 

 Polygonum Persicaria 1-. Lady"s Thumb. In waste places. 

 Polygonum hydropiperoides Michx. Mild Water Pepper. In wet soil. 

 Polygonum Hydropiper L. Smart-weed. In moist waste places. 

 Polygonum punctatum Ell. Water Smart-weed. In swamps and wet places. 

 Polygonum orientale L. Prince's Feather. In waste places. 

 Polygonum Virginianum L. Virginia Knotweed. In woods. 

 Polygonum aviculare L. Door-weed. Knotgrass. In cultivated grounds. 

 Polygonum erectum L. Erect Knotweed. In moist soil. 

 Polygonum tenue Michx. Slender Knotweed. In dry soil. 

 Polygonum Convolvulus L. Black Bindweed. In cultivated grounds. 

 Polygonum cilinode Michx. Fringed Black Bindweed. Tullytown, Joseph Craw- 

 ford. 

 Polygonum scandens L. Climbing False Buckwheat. In woods and thickets. 

 Polygonum Zuccarinii Small. Japanese Knotweed. Penn Valley, Dr. N. L. Britton. 

 Polygonum sagittatum L. Arrow-leaved Tear-thumb. In wet soil. 

 Polygonum arifolium L. Halbred-leaved Tear-thumb. In moist soil. 



Order 10. CHENOPODIALES. 

 Family i. Chenopocliaceae Dumort. 



Chenopodium album L. Lamb's Quarters. In waste grounds. 



Chenopodium glaucum L. Oak-leaved Goosefoot. Andalusia, I. C. Martindalc; Scl- 



