MOB ACE AE. 125 



Family 1. ULMACEAE. Elm Family. 



Flowers borne in clusters on twigs of the preceding season; fruit a samara 

 or nnt-like. 1. Vlmus. 



Flowers borne on twigs of the season, the pistillate mostly solitary; fruit 

 a drupe. 2. Celtis. 



1. ULMUS. 



Leaves slightly rough above; samara densely ciliate. 1. U. Americana. 



Leaves very rough above; samara not ciliate. 2. U. fulva. 



1. Ulmus Americana L. American White Elm. M. p. 338. Moist woods, 



especially along rivers in rich soU. Early spring. 



2. Ulmus fulva Michx. Slippery or Bed Elm. M. p. 338. Woods. Early 



spring. 



"2. CELTIS L. 



Leaves smooth above. 1. C. occidentalis. 



Leaves scabrous above. 2. C. crassifolia. 



1. Celtis occidentalis L. Nettle-tree, Sugar-berry, Hackberry. M. p. 



339. Dry soil. Spring. 



2. Celtis crassifolia Lam. Hackberry. M. p. 339. Dry soil. Spring. 



jK-Mcts— Sellersvillo (Fr.). Montgomery — Green Lane (Br.). Lancas- 

 ter— (P.). Northampton.— {P.). Dauphin— {P.) . 



Family 2. MORACEAE- Mulberry Family. 



Trees or shrubs; stipules fugacious. 



Staminate and pistillate flowers spiked; leaves dentate or lobed. 



1. Morus. 

 Staminate flowers racemose or spiked; pistillate capitate. 



Pistillate perianth deeply 4-clef t ; leaves entire. 2. Toxylon. 

 Pistillate perianth 3-4 toothed; leaves various. 3. Broussonetia. 

 Erect or twining herbs; stipules persistent. 



Twining vines; pistillate flowers in ament-like clusters. 



4. Humulus. 

 Erect herb; pistillate flowers spicate. 5. Cannabis. 



1. MORUS. 



Leaves rough above, pubescent beneath; fruit purple, spikes 2-6 cm. long. 



1. M. rubra. 

 Leaves smooth and glabrous, or very nearly so, fruit nearly white; spikes 

 1-1.5 cm. long. " " 2. M. alba. 



1. Morus rubra L. Bed Mulberry. M. p. 340. Rich woods. Spring. 



2. Morus alba L. White Mulberry. M. p. 340. Spontaneous near houses. 



Spring. 



2. TOXYLON Raf. 

 1. Toxylon pomiferum Raf. Osage orange. M. p. 340. Planted for 

 hedges and occasionally spontaneous. Spring. 



3. BROUSSONETIA L'Her. 

 1. Broussonetia papyrifera (L.) Vent. Paper Mulberry. M. p. 340. 

 Escaped from cultivation. Spring. 



