108 CLASS XX. ORDER XIII. 



Leaves lanceolate toothed. — casianea^ (yel- 

 low oak) leaves acuminate. — Leaves 3-lobed at 

 the end — nigruj (black jack) leaves wedge-form. 

 — Leaves sinuate with mucronate loees, ob- 

 long — discolor^ (two-coloured oak) downy leaves. 

 — rubra, (red-oak) leaves glabrous obtuse, with 

 acutish lobes, calyx flat. — coccinea, (scarlet oak) 

 leaves glabrous deep-sinuate, calyx with tapering 

 base. — /^a/Ms;m,(pinoak) leaves glabrous deep-sin- 

 uate downy at the axils of the veins, calyx with flat- 

 turbinate base. — Differ from the last in being 

 OBovATE. — tinctorioj (black oak) leaves pubescent 

 beneath with obsoletely toothed lobes — iHcTfolia, 



(scrub oak) leaves 3 to 5-lobed downy beneath 



Leaves sinuate with awnless lobes — al6a, 

 (white oak) leaves downy with entire obtuse lobes. 



Juglans. Staminate flowers — ament imbricate : 

 calyx a scale : corol 6'parted : filaments 4 to 18. 

 Pistillate flowers — calyx 4- cleft superior : corol 4- 

 cleft : styles 2 : drupe coriaceous or woody : nut 

 sulcate. I2 • 50. 94 — Leafets 7 or under, acumi- 

 nate. — albaj (hickory) leafets scabrous pubescent 

 beneath lanceolate, fruit subquadrangular. — sgua- 

 mosQy (shag-bark walnut) leafets soft-pubescent 

 lance-oblong, fruit ovate — glabra, (pignut) leafets 

 ovate glabrous with resinous dots beneath, fruit ob- 

 cordate. — Leafets 9 or over— m^ra, (black wal- 

 nut) leafets lanceolate sub-pubescent, fruit globu- 

 lar.— a/wara, (bitter nut) leafets lanceolate acumi- 

 nate about 9, odd one sub-sessile, putamen thin, — 

 cinerea (butter-nut) leaves lance oblong with soft 

 pubescence and viscous petioles, fruit oblong > 



Fagus. Staminate flowers— ament roundish : 

 calyx 5-cleft, bell-form : stamens about 12. Pis- 

 tillate flowers — calyx 4-toothed, setose : germs 2 : 

 nuts 2 inclosed in the calyx becoming coriaceous 

 echinatc 50. 99— /frrw^mea (beach) leaves ovate 



