LEAF INDEX. 21 



SlMPLE-OPPOSITE-SERRATE OR TOOTHED OR CRENATE (NOT LOBED). 



Leaves very large, round-cordate, veins rusty or woolly beneath, Viburnum 



stems straggling. lantanoides 37a 



Crenate or nearly entire, often slightly rusty beneath, swamps. Viburnum cassinoides 37g 

 Coarsely toothed, petiole j inch or less, downy beneath, mostly 



with stipules. Viburnum pubescens 37e 

 Coarsely toothed, petiole > j inch, tall shrub, mostly with 



stipules, rare. Viburnum dentatum 37f 

 Petiole nearly 1 in. , flattened or winged, teeth fine and curved, 



not ciliate, tall or tree-like. Viburnum Lentago 37h 

 Leaves ovate and taper-pointed, petioles J to f inch long. 



Low erect shrub, in dry soil, margins usually ciliate. Diervilla trifida 40a 



See also (a tall shrub with leaves finely serrate, southern). Euonymus 



atropurpureus 16b 



Leaves obovate and obtuse, nearly sessile, low spreading shrub. Euonymus 



Americanus 16a. 



SlMPLE-OPPOSITE-LoBED. 



Climbing shrub, leaves 3-lobed and serrate, bristly-hairy. Humulus lupulus 6. a 

 Petiole with stipules and glands, leaves large with scattered 



hairs beneath. Viburnum Opulus 37 b 



See also (a smaller shrub, nearly smooth, northern and rare). Viburnum 



pauciflorum 37c 



Petiole about 1 inch or less, mostly with narrow stipules, very Viburnum 



downy. acerifolium 37 d 



Lobes three, long tapering, leaves large, finely 2-serrate, small 



tree, bark striped. Acer Pennsylvanicum 2la 



Sinuses rounded and entire, or deep and narrow with notch at inmost point. (Maples) 



Sinuses rounded, lobes with 5 teeth or less, pale beneath. Acer saccharinum 21c 



Sinuses deep, notched, lobes with many teeth, silvery beneath. Acer dasycarpum 21d 

 Sinuses not rounded, not deep and narrow, not entire, margin 



serrate, notches acute. (Maples) 



Nearly smooth, pale beneath, mostly 2-serrate, twigs reddish. Acer rubrum 21e 



Downy beneath, coarsely serrate, with wrinkled surface, shrub. Acer spicatum 21b 



