AN INDEX BASED ON THE LEAVES. 



" If description agrees, step to right ; if not, step dotvn." 



Clematis Virginiana la 

 Clematis verticillaris Ib 

 Staphylea trifoliata 22a 



-COMPOUND OPPOSITE. 



Leaflets 3, shrubs or vines. 



Climbing shrub, clinging by petioles, moist soil, common. 

 See also (a shrub, usually trailing, in rocky places, rare). 

 Erect shrub, side leaflets nearly sessile, serrate, bark striped. 

 Leaflets, 5 or more, pinnate. 



Sharply serrate, stalks short, mostly downy beneath, shrubs. (Elders) 



Leaflets 5-11, long-tapering, stem soft, heart of stem white. Sambncns Canadensis 36a 

 Leaflets 5-7, bark warty, stem woody, heart of stem brown. Sambncns racemosa 36b 

 Leaflets 7-11, nearly sessile, finely serrate, nearly smooth, 



tall tree, swamps. Fraxinus sambucifolia 53e 



Leaflets 5-9, stalked, not sharply and evenly serrate, trees. (Ashes) 

 Petioles and twigs pubescent, finely toothed, shores of 



lakes and rivers. 



Petioles and twigs smooth, margins nearly entire. 

 Leaflets pale beneath, or slightly downy, rich woods. 

 Leaflets green beneath, smooth, moist soil, not common.. 

 See also (a southern tree with 4- sided twigs and finely 



toothed leaflets). 



Fraxinus pubescens 53b 



Fraxinus Americana 53a 

 Fraxinus viridis 53c 

 Fraxinus 



quadrangulata 53d 



COM POUND- ALTERNATE-PALMATE or of only 3 leaflets. 



Stems unarmed, low shrubs or climbing vines. 



Leaflets 3, notched, or toothed, or crenate, or nearly entire. 



Petiole long, mostly 2-in. or more, teeth few, very poisonous. Rhus toxicodendron 23e 

 Petiole about 1-in. or less, leaflets nearly sessile, toothed 



above middle, fragrant. 

 Leaflets five, coarsely serrate, climbing or trailing, harmless. 



23f 



Rhus Canadensis 

 Ampelopsis 



quinquefolia 20a 



Stem unarmed, a small tree, leaflets 3, sessile and nearly entire, 



southern. Ptelea trifoliata 12a 



Stems prickly or bristly, erect or trailing or climbing. 



Stem climbing, stipules joined along petiole, leaflets 3 or 



o-pinnate. Rosa setigera 27a 



Leaflets 3 or 5-pinnate, pale-glaucous and downy beneath. (Raspberries) 

 Twigs and petioles, densely bristly, bristles weak and 



nearly straight. Rubns strigosus 26b 



Twigs and petioles with stout hooked prickles, stems very 



glaucous. Rubns occidentalis 26c 

 Leaflets 3 or 5-palmate, not glaucous. 



Erect, downy beneath, stalked, with end stalk long and 



prickly. Rubns villosus 26d 



Stems trailing, leaflets green and smooth beneath. 



Bristles numerous, weak and slightly curved, stem slender. Rubns hispidus 26f 



Prickles scattered, stout and curved, stem shrubby. Rubns Canadensis 26e 



15 



