KEY TO TREES AND SHRUBS IN AUTUMN 



12 a Each leaf extending down the stem, not jointed to it; 



leaves awl-shaped Cryptomeria. p IOQ 



b Each leaf not extending down the stem but jointed 



to it 13 



13 a Leaves thick, somewhat 4-sided; branchlets very rough. 14 

 b Plants not completely as in a 15 



14 a Leaves about % in. long; native shrub Corema. p 180 



b Leaves usually more than *4 in. long Picea. p 1 08 



15 a Leaves rigid, tapering to the apex, somewhat channeled 16 

 b Leaves flat, not channeled or tapering 17 



16 a Native shrubs; leaves sometimes arranged in threes on 



the stem Juniperus. p 109 



b Cultivated shrubs; leaves arranged in 4 rows on the 



stem Chamaecyparis. p IOQ 



17 a Branches rather rough, covered with small projections 



where the leaves have been attached 18 



b Branches without projections as in a 19 



1 8 a Leaves blunt at apex, about % in. long, whitish be- 



neath when fresh Tsuga. p 108 



b Leaves pointed at apex, about %-i in. long, green 



beneath Taxus. p 107 



19 a Leaves deciduous, appearing only on new branches; 



the branchlets often deciduous Taxodium. p IOQ 



b Leaves evergreen, appearing on 2-year old branches 



Abies, p 108 



Leaves Opposite, Compound 



20 a Leaves or leaf-scars opposite or in whorls on the 



branches 21 



b Leaves or leaf-scars alternate on the branches 71 



21 a Leaves compound, composed of 3 or more leaflets 22 



b Leaves simple 30 



22 a Leaves palmately compound, consisting of 5 or more 



leaflets Aesculus. p 183 



b Leaves pinnately compound 23 



23 a Climbing woody vine often with aerial rootlets 



Tecoma. p 212 

 b Trees or shrubs not climbing 24 



24 a Leaflets 3 or 5 to each leaf 25 



b Leaflets 7-11, rarely 5, to each leaf 27 



25 a Twigs 4-angled; fruit berry-like; plant more usually 



cultivated in tubs Jasminum. p 198 



b Twigs not 4-angled; fruit not berry-like . , 26 



26 a Leaflets coarsely and irregularly toothed; fruit winged 



Acer negundo. p 182 

 b Leaflets finely toothed ; fruit an inflated capsule 



Staphylea. p 182 



66 



