LORANTHACEAE 111 



3. BROUSSONETIA L'Her. 



1. Broussonetia papyrifera (L. ) Vent. Paper Mulberry. (Man. 

 p. 340; I. F. y". 1260.) Escaped, N. Y. to Ga. and Mo. — Pennsylvania : 

 Lancaster; Franklin. 



Family 4. ULMACEAE Mirbel. Elm Family. 



Fruit a samara : embryo straight. i. Ulmus. 



Fruit a drupe : embryo with couduplicate cotyledons. 2. Celtis. 



1. ULMUS L. 



Leaf-blades smooth, or roughish above : samaras 10-12 mm. long. 



I. U. Aviericana. 

 Leaf-blades very rough above : samaras 14-24 mm. long. 



Leaf-blades typically over 10 cm. long and samaras over 2 cm. long : native 



species. 2. U.fulva. 



Leaf-blades typically less than 9 cm. long and samaras less than 2 cm. 

 long : naturalized species. 3, U. campestris. 



1. UlmuB Americana L. American, White or Water Elm. (Man. 

 p. 338; I. F. /. 1250.) In moist soil, Newf. to Man., Fla. and Tex.— 

 Pemisylvania : Northampton ; Lancaster ; Huntingdon ; Monroe ; 

 Tioga ; Franklin ; Chester ; Delaware ; Allegheny. 



2. Ulmus fulva Michx. Slippery or Red Elm. (Man. p. 338; I. 

 F. y. J2^j.) In woods and along streams, Quebec to N. Dak., Fla. and 

 Tex. — Pennsylvania : Northampton ; Montgomery ; Lancaster ; 

 Huntingdon ; Franklin ; Chester ; Delaware ; Allegheny. 



3. Ulmus campestris L. (Man. p. 338.) Adventive or naturalized 

 from Eu. — Pennsylvania : Northampton, on Bushkill. 



2. CELTIS L 



Leaf-blades smooth or nearly so above. i. C. occidentalis. 



Leaf-blades very rough above. 2. C. crassifolia. 



1. Celtis occidentalis L. Hackberry. Sugar-berry. (Man. p. 339; 

 I. F. /. 1255.) In dry soil, Quebec to Man., La., N. C, Mo. and Kans. 

 — Pennsylvania : Northampton ; Dauphin ; Lancaster ; Franklin ; 

 Huntingdon; Monroe ; Chester ; Delaware; Allegheny. 



2. Celtis crassifolia Lam. Hackberry. (Man. p. 339.) N. Y. to S. 

 C, Ohio, 111., Mo. and Tenn. — Pennsylvania : Northampton ; Lancas- 

 ter ; Dauphin. 



Order 7. SANTALALES. 



Tree-parasites : leaves opposite, often scale-like : fruit baccate. 



Fam. I. LORANTHACEAE. 



Root-parasites : leaves alternate (in our genera): fruit a drupe or nut. 



Fam. 2. Santalaceae. 

 Family i. LORANTHACEAE D. Don. Mistletoe Family. 

 Anthers i-celled : berrj' peduncled : leaves scale-like, with united bases. 



1. Razoumofskya. 

 Anthers 2-celled : berry sessile : leaves with thick flat blades. 



2. Phoradendron. 



