66 



Order 84.— URTICACEJE. 104. 



Sub-Order 1.— ULMACE.E. 



1. Ulmus, L. 



fiilva, Miclix. (Slippery Elm.) 



Rich low woods; Brandy wine, &c. Frequent. April. 

 Americana, L. (American Elm.) 



Rich grounds along streams. Frequent. April. 



2. Celtis, Tourn. 



occidentals, L. (Sugar-berry. Hackberry.) 



Moist woods along Brandy wine, &c. Frequent. May. 



occidentalis, L., var. crassifolia, Gr. 



Hilly woods, &c; Brandywine. Not very common. 

 May. 



occidentalis, L., var. pumila, Gr. 



Dry rocky hills; Rocky Ridge. Frequent. May. 



Scb-Order 2.— artocarpe^e. 



3. Morus, 1 Tourn. 



rubra, L. (Red Mulberry.) 



Rich woods throughout the county. Frequent. May. 

 alba, L. (White Mulberry.) 



Fencerows, yards, &c. Frequent. May. 



4. Broussonetia, Vent. 



papyrifera, Vent. (Paper Mulberry.) 



Partially naturalized about yards. May. Native of 

 Japan. 



Sub-Order 3.— URTICE^E. 



5. Urtica, Tourn. 



dioica, L. (Stinging Nettle.) 



Roadsides and waste places. Frequent. June. Eu- 

 rope. 



6. Laportea, Gaudich. 



Canadensis, Gaud. (Wood Nettle.) 

 Moist sandy woods. Frequent. July. 



7. Pile a, Lindl. 



purnila, Gray. (Richweed.) 



Damp rich woods. Common. July. 



Wood solid and durable. 



