68 MORACEAE. 



the autumn growth, and distinct medullary rays ; moderate terete 

 twigs ; round homogeneous pale pith ; alternate or exceptionally 

 opposite half-round or elliptical leaf-scars with a sometimes very 

 indistinct crescent-shaped bundle-trace ; no stipule-scars ; ovoid 

 appressed sessile solitary buds, the terminal small, with 2 or 3 

 exposed scales ; ovate toothed or lobed rather large petioled 

 leaves ; dioecious inconspicuous apetalous flowers in catkins or 

 small heads ; and small aggregated drupelets. 



1. Leaves alternate. 2. 



Leaves uniformly opposite. B. papyrifera contraria. 



2. Leaves flat. 3. 



Leaves concave. B. papyrifera cucullata. 



3. Leaves at most with few coarse lobes. 4. 



Leaves dissected into narrow divisions. B. papyrifera dissecta. 



4. Fruit red. B. papyrifera. 

 Fruit white. B. papyrifera leucocarpa. 



MORUS. Mulberry. 



Deciduous trees with gray-brown bark ; milky sap ; brown 

 rather soft wood with small ducts somewhat larger and -crowded 

 in the late vernal growth and distinct medullary rays connected 

 by transverse lines of wood parenchyma ; rather slender terete 

 twigs; roundish continuous pale pith; alternate often 2-ranked 

 half-round somewhat raised leaf-scars with 7 or more bundle- 

 traces scattered or in an ellipse ; unequal stipule scars ; no end 

 bud, the ovoid sessile lateral buds with about 6 exposed scales ; 

 broadly ovate serrate or deeply and unequally lobed petioled 

 leaves; small imperfect apetalous flowers in catkin- or head-like 

 clusters, and rather small aggregate fruits with fleshy sepals. 



1. Buds spreading: scales dark-margined: leaves rough above. 2. 

 Buds appressed, uniformly colored : leaves nearly smooth. 3. 



2. Leaves dull, not very pubescent. (Red mulberry). M. rubra. 

 Leaves glossy above, tomentose beneath. M. rubra tomentosa. 



3. Leaves rather exceptionally lobed. (White mulberry). M. alba. 

 Leaves mostly lobed. 4. 



4. Leaves cuneate, toothed, white-veined. M. alba nervosa. 

 Leaves rather regularly lobed. 5. 



