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 
