KEY TO TREES AND SHRUBS IN AUTUMN 



73 a Tree usually with thorns i in. or more long on the 



trunk or branches; pods 6 in. or more long, brown; 



branches zigzag Gleditsia. p 170 



b Trees or shrubs not completely as in a 74 



74 a Leaflets with more or less entire margins 75 



b Leaflets with toothed margins 76 



75 a Fruit a black capsule i in. or less long.Xanthoxylum. p I?Q 

 b Fruit a pod 3-6 in. long; usually spines for stipules; 



branches usually zigzag Robinia. 



76 a Leaves doubly compound Aralia. p IQO 



b Leaves singly compound 77 



77 a Leaves usually palmately compound or of 3 leaflets ; 



fruit an aggregate of drupes but usually absent 



Rubus. p 164 

 b Leaves pinnately compound; fruit berry-like, fleshy, 



the enlargement of the receptacle tube Rosa, p 166 



c Fruit yellow, fleshy, orange-like ; leaflets 3 ; petioles 



winged Citrus trifoliata. p 179 



78 a Climbing or trailing shrubs 79 



b Erect trees or shrubs 82 



79 a Leaflets 9-13 Wistaria, p 173 



b Leaflets 3-7 80 



80 a Vines with tendrils adhering by expanded disks 



Parthenocissus. p 184 



b Vines without tendrils 81 



81 a Leaflets 3; shrub with aerial rootlets. .Rhus radicans. p 181 

 b Leaflets 5 Akebia. p 154 



82 a Leaflets 3 83 



b Leaflets 5 or more 86 



83 a Leaflets with more or less toothed margins 



Citrus trifoliata. p 179 

 b Leaflets with entire or very sparingly toothed margins. . 84 



84 a Wild shrub; fruit grayish, globose, somewhat fleshy 



Rhus radicans. p 181 

 b Cultivated or wild shrubs; fruit a pod, or circular and 



winged 85 



85 a Leaflets hairy beneath; fruit a flattened oblong pod about 



2 in. long Laburnum, p 173 



b Leaflets not hairy beneath; fruit circular, winged 



Ptelea. p 179 



86 a Leaflets with 2-4 coarse teeth at the base; fruit winged 



Ailanthus. p 7/p 

 b Leaflets not as in a 87 



87 a Fruit of red berry-like drupes in cymes, present on the 



tree; leaflets toothed especially toward the apex 



Sorbus. p 167 

 b Fruit and leaflets not completely as in a, or fruit wanting 88 



70 



