MOB ACE AE 31 



later growth, marked tangential pattern of wood parenchyma 

 in the autumn growth, and distinct medullary rays; moderate 

 terete twigs; round homogeneous pale pith diaphragmed at the 

 nodes; alternate or exceptionally opposite half-round or ellip- 

 tical leaf-scars with a sometimes very indistinct crescent- 

 shaped bundle-trace; narrow 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 1 or small 

 heads; and aggregated drupelets. 



1. Leaves alternate. 2. 



Leaves commonly opposite. B. papyrifera contraria. 



2. Leaves flat. 3. 



Leaves concave. B. papyrifera cucullata. 



3. Leaves 1 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. 



MOBUS. Mulberry. 



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

 rather soft wood with small ducts somewhat larger and crowd- 

 ed in the late vernal growth, and distinct medullary rays con- 

 nected by transverse lines of wood parenchyma; rather slen- 

 der. 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 collaterally branched 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. 



