158 American Midland Naturalist Monograph No. 7 



1 . Morus L. — Mulberry 



1. Leaves becoming scabrous above, the lower surface pubescent, or 



hispidulous along the veins; lateral lobes, if present, caudate; 



buds somewhat divergent, acute; fruit reddish-purple, 2 cm or 



more in length; native tree; woods, common. May-June. Red 



Mulberi'y M. rubra L. 



1. Leaves glabrous, somewhat glossy and nearly smooth above; lower 

 surface glabrous or nearly so, except on the veins or in their 

 axils; lateral lobes usually obtuse; native of Asia. 

 2. Fruit whitish or pinkish, 1-L5 cm long; cultivated, and rarely 



escaped. May. White Mulberry M. alba L. 



2. Fruit dark red, smaller; a small bushy tree; leaves commonly 

 much lobed; along fences and in woods, common; absent 

 from the southern counties. [M. alba var. tatarica (L.) Ser.] 

 M. tatarica L. 



2. Broussonetia L'Her. — Paper Mulberry 



B. papyrifera (L.) Vent. Planted as a shade tree, and sometimes 

 escaped from cult.; introd. from e. Asia; Hardin, Jackson, Pope, and 

 Randolph counties. 



3. Madura Nutt. — Osage-orange. Hedge-apple 



M. pomifera (Raf.) Schneid. Commonly planted for fences and 

 windbreaks, sometimes spontaneous; native in Ark., e. Okla., and e. 

 Tex. May-June. 



72. Cannabinaceae Lindl. — Hemp Family 



1. Erect herbs; pistillate flowers in spikes 1. Cannabis 



1. Stems twining; pistillate flowers in catkin-like drooping clusters (hops) 

 2. Humulus 



1. Cannabis L. — Hemj). Marijuana 



C. sativa L. Moist soil, edges of fields, along roads, waste ground, 

 local; nat. from Asia. July-Sept. 



2. Humulus L. — Hop 



1. Leaves 3-lobecl or unlobed, the petioles usually shorter than the 

 blades; pistillate catkins much enlarging and becoming cone- 

 like, the bracts obtuse or acutish, glandular at the base, not 

 ciliate; native perennial along fences and in sandy soil at edges 

 of woods, common. Aug. -Oct. American Hop [H . lupulus sensu 

 auth., non L.] H. americanus Nutt. 



1 Leaves deeply 5- to 7-lobed; pistillate catkins not greatly enlarg- 

 ing in fruit, the bracts acuminate, ciliate; annual, native of Asia; 

 waste places, sparingly nat. in 111. Japanese Hop. [? Antidesma 

 scandens Lour.] H. japonicus Sieb. & Zucc. 



