RUTACEAE, III 
CALOPHACA, 
Deciduous shrubs (or grafted as small standard trees) with 
slender terete twigs; small roundish continuous pith; alternate 
minute low roundish leaf-scars with a single bundle-trace; 
narrow stipule-scars or persistent triangular stipules; small 
sessile buds with few loose scales; odd-pinnate leaves: with small 
round entire sessile leaflets; rather large perfect papilionaceous 
flowers in sparse racemes; and terete pods. 
Leaflets about 15: flowers under Io. C. wolgarica. 
Leaflets about 20: flowers about 12. C. grandiflora. 
PuerAriA. Kudzu Vine. 
Herbaceous twining plants, woody and persistent only at 
the base, with alternate trifoliolate leaves with very large-lobed 
leaflets; and (in warm enough regions) perfect purple papilion- 
aceous flowers in axillary spikes, followed by long legumes. 
Leaflets rather rhombic-ovate, ciliate. P. hirsuta. 
Family RUTACEAE. Rue Family. 
A moderate sized family, chiefly important commercially as 
producing the Citrus fruits; somewhat used in ornamental 
planting. 
TripHAsiIA. Limeberry. 
Evergreen shrubs with pale hard wood with minute diffused . 
ducts and fine medullary rays; rather slender green twigs; 
paired axillary spines; no stipule scars; alternate trifoliolate 
pellucid-punctate leaves; moderately small perfect polypetalous 
white fragrant flowers solitary in the axils; and thick-skinned 
red berries with I or more very large seeds. 
Glabrous: terminal leaflet enlarged. T. trifohia: 
PTELEA. Hop Tree. 
Deciduous shrubs or small trees with soft wood Mens larger 
crowded vernal ducts and small summer ducts in wavy tan- 
gential patterns, and fine medullary rays; rather slender round- 
ish twigs with round continuous pith; alternate little-raised 
finally horseshoe-shaped leaf-scars with 3 bundle-traces; no 
stipule-scars ; small hairy superposed lateral buds but no end bud; 
