122 FLORA OF PHILADELPHIA. 



(tap ol'the aeorn turbinate or hemispheric. |p ■ 

 Inner bark gray to reddish ; leaves deeply lobed. 



Leaves shining both sides; lobed td near the midrib. 



3. Q. coeeinea. 

 Leaves dull and paler beneath ; acorn ovoid. 

 "• ' 4. Q. bdredlis'. 



Inner bark orange. .->■<■ 5. $. veluiina. 



Reaves white or. gray-tpmentpse beneath. , . >,,.,,, 



Large trees; leaf-lobes lanceolate to linear-lanceolate, long. 



6. Q. digitata. 

 ; , Shrub or low tree;, Jeaf -lobes triangular-ovate, short. 



7„, Q. nana. 



Leaves 3-5 lobed above the middle or entyre^ obovate or spa\ulate in outline. 



Leaves obovate, crenate, brown-floceose beneath. 8. Q. Marylandica. 



With characters intermediate between Q, Marylandica and Phellps, , 



9. Q. Budkini. 

 Leaves spatulate, glabrous both sides.. 10. Q. nigra. 



, , , Leaves entire, oblong., lanceolate or linear-oblong, 



Leaves linear-oblong, green and glabrous on both sides. 11. Q. Phellos. 

 With characters intermediate between Q.rgjfcf& and Q. Phellos. 



12. Q. heterophylla. 

 Leaves oblong or lanceolate, br-own-tomentose beneath. 13. Q. imbricaria. ' 



B f) Le.aflie$ r or their, lobes not, bristle-tipped, deciduous; acorns ^maturing in 



., ,'..,■,',, , autumn of . firsti y@ar. , .,. , ■, , , 



"''" Leaves pinnatifld' or' pinnately lobed. 



Mature leaves pale or glaucous and glabrous beneath; cup shallow. 



,1 i,;/ 'i i. 14. Q. alba. 



Mature leaves tomentulose. beneath; cup ^one-third to fully as long; as 

 ■ the'iacorn. '"' •'! ' ,1 '" 



Upper scales of the cup not awned. 



Leaves yellowish-brown tomentulose ■ beneath ; acorn ovoid. 



, ^ , , , , , .15^ Q, minor. . _ . , f 



Leaves white-tomentulose bpn^th;, Scorn depressea-glpbpse.l '.',.. [] 

 ' ' , ,, .' 16. Q. tyrdta. 



Upper stales awned, forming a fringe around the' acorn. 



17. Q. macrocarpa. 



>' ■ ii" ;1 Leaves 'crenate or dentate, not lobed. 



Fruit peduncled. 



Peduncle much longer than' petioles ; leaves white-tomentulose beneath. 



18. Q. platanoidvs. 

 Peduncle equalling or shorter than the petioles; leaves gray -tomentu- 

 lose beneath. 



Bark white, flaky. 19. Q. MichauxU. 



Bark close. 20. Q. Primus: 



Fruit sessile or nearly so. , ■ i : i - \ 



Tall trees. , 21. Q. acuminata. 



Shrub or low tree; leaves oval or obovate. 22. Q. prinoides. 



1. Quekcus rubra L. Bed Oak. M. p. 333. Rich or poor soil. Early 



" summer. 



2. Qtjbrous palustris Du ,B,oi. Swamp 0a*, Pin Oak. M. p. 333. Low 



ground. Early summer. 



3. Quercus cqocinea Wang. Scarlet Oak. M. p. 333. Moist or dry soil. 



Early summer. ■ ■ 



