112 RUTACEAE. 



palmately trifoliolate stalked leaves with large nearly entire 

 pellucid-punctate leaflets ; rather small perfect open polypetalous 

 flowers in compound corymbs ; and densely clustered slender- 

 pedicelled round veiny samaras. 



1. Twigs glabrous. 2. 



Twigs finely tomentose. P. trifoliata mollis. 



2. Leaves green. P. trifoliata. 

 Leaves yellow. P. trifoliata aurea. 



PHELLODENDRON. Cork Tree. 



Small deciduous trees with soft-corky bark ; brown wood 

 with rather large ducts crowded in the spring wood and minute 

 ducts in wavy tangential lines in summer, and fine medullary 

 rays ; rather stout rounded twigs ; crenate continuous white pith ; 

 opposite or alternate, but then 4-ranked, somewhat elevated 

 horseshoe shaped leaf-scars with 3 simple or compound bundle- 

 traces ; no stipule scars; small hairy edged buds ;' abruptly pin- 

 nate leaves with several nearly entire leaflets ; small dioecious 

 greenish flowers in stalked terminal clusters ; and black several- 

 seeded berry-like drupes. 

 Leaflets lanceolate, slightly crenulate. P. amurense 



SKIMMIA. 



Evergreen shrubs with alternate subsessile simple pellucid- 

 glandular leaves; small imperfect polypetalous white flowers in 

 terminal clusters; and rather small red berry-like fruits. 

 Leaves oblong or obovate. S. japonica. 



ZANTHOXYLUM. Prickly Ash. 



Deciduous (or in warm countries evergreen) aromatic shrubs 

 or small trees with yellowish wood with minute ducts, slightly 

 smaller and less crowded in summer, and fine medullary rays ; 

 moderate rounded twigs with prickles (sometimes a pair beside 

 each leaf-scar); rounded continuous pith; alternate somewhat 

 raised half-round or 3-lobed leaf-scars with 3 bundle-traces ; no 

 stipule-scars ; round red-hairy superposed buds with indistinct 

 scales ; odd-pinnate pellucid-punctate moderate sometimes 

 prickly leaves ; small dioecious polypetalous flowers in axillary 



