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. 
I. 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. 
