FAG ACE AE (BEECH FArllLY) 



339 



Muhlenbergii. 



?rinoiileH. 

 'rinuH. 

 rirgininvn. 



«, Fruit sessile or on verj' short peduncles. 



Cup 2.5-3 cm. broad ; scales free to the base ... 6. ^. MichatMli. 



Cup at most 2.5 cm. broad, only the small tips of the scales 

 distinct. 

 Leaves with acute or pointed teeth. 



Leaves with 8-18 teeth on each margin . . 1, 



Leaves with 3-7 teeth on each margin . . 8. 



Leaves with somewhat rounded teeth 9. 



a. Leaves coriaceous, evergreen, entire or rarely spiny-toothed . . 10. 

 2. Bark dark, furrowed; leaves deciduous, their lobes and teeth acute and bri.stle"i.oint<Mi (at 

 least in youth) ; stamens mostly 4-6 ; cup-scales membranaceous ; stvles long and spread- 

 ing ; abortive ovules near the top of the perfect seed ; inner surface of shell tomentose; 

 fruit maturing the second year. — ERYXiiRoiiALANUS Spach. (Kku 

 or Black Oaks.) /. 

 /. Leaves pinnatitid or lobed, slender-petioled, not coriaceous, the lobes 

 or teeth conspicuously bristle-pointed ff. 

 g. Mature leaves green on both sides ; species closely related and 

 freely hybridizing h. 

 h. Longest lobes of the leaf about equaling (never twice as long as) 



the breadth of the broadish middle portion of the leaf . . 11. Q.vubr9, 

 h. Longest lobes of the leaf 2-6 times as long as the breadth of the 

 narrow middle portion of the leaf i. 

 i. Scales of the cup closely appressed j. 

 j. Expanded saucer-shaped portion of the cup 3-5 mm. high, 



1-1.5 cm. broad 12. Q. palustris. 



j. Cups larger. 



Cups brown or castaneous, the scales finally glabrate and 



lustrous 13. C- coccinea. 



Cups ashy with persistent dull pubescence. 



Cup 2-2.6 cm. broad ; acorn l.S-2.3 cm. thick . . . 14. Q. iexana. 

 Cup 1.2-1. S cm. broad ; acorn O.S-l.T cm. thick . . 15. Q. ellipnoidalis. 

 i. Upper scales of the cup loosely imbricated . . . .16. Q. relutina. 



g. Mature leaves whitish or grayish beneath with close down. 



Lobes elongate, at least the terminal falcate 17. Q.falcnta. 



Lobes broadly triangular 18. ^. ilicifolia. 



f. Leaves entire or with few teeth (or somewhat 3-5-lobed at summit), 

 commonly bristle-pointed ; acorns globular, small (rarely over 

 13 mm. long) k. 

 k. Leaves widening or often much dilated upward and more or less 

 sinuate or 3-5-lobed. 

 Leaves glabrous ; cup saucer-shaped or hemispherical . . .19. Q. nigra. 

 Leaves rusty-pubescent beneath ; cup turbinate . . . 20. Q, marilandica. 



k. Leaves not dilated upward, generally entire. 



Leaves permanently stellate-pubescent beneath . . 21. Q.imhricaria. 

 Leaves glabrous or glabrate beneath 22. Q.phellos. 



1. Q. alba L. (White O.) Leaves when young 

 white-lanate beneath, when mature pale or glaucous 

 beneath, bright green above, obovate-oblong, ohliquehj 

 cut into 5-9 oblong or linear and obtuse mostly fntire 

 lobes; cup hemispherical-saucer-shaped, rough or tuber- 

 cled at maturity, puberulent, much shorter than the 

 ovoid or ellipsoid (2-3 cm. long) acorn.— Dry i.sh or 

 upland woods, s. Me. to Ont., Minn., and southw. 

 Fig. 670. 



2. Q. stellata Wang. (Post 

 O., Iron O.) Leaves grayish- 

 or brownish-downy under- 

 neath, dark green and rough 

 above, thickish, sinuately cut 

 into 5-7 rounded divergent 

 lobes, the upper ones much 

 larger and often l-?>- notch ed ; 



acorn 1-2 cm. long. (Q. minor Sarg.) — Sandy or 

 sterile soil, Mass. to la., Neb., and southw. Fu;. 671. 



Q. Margaretta Ashe, with narrower small leaves 

 glabrate and with lobes merely rounded at tip, is pos- 

 sibly a hybrid of Q. stellata and Q. alba. 



3. Q. lyrata Walt. (Over-cup O., Swamp Post 0.) 

 Leaves crowded at the end of the branchlets, obovate- 

 oblong, acute at base, more or less deeply 7-9-lobed, 671. Q. stellata. 



