FAGACEAE (BEECH FAMILY) 



339 



6. Q. Miehauxii. 



7. Q 



S. Q. 



9. 

 10. 



Muhlenhergii. 

 prinoides. 

 Q. PrinxiH. 

 rirginiana. 



/■ 



g- 



e. Fruit sessile or on very short peduncles. 



Cup '2.5-:3 cm. broad ; scales free to the base .... 

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

 distinct. • 



Leaves with acute or pointed teeth. 



Leaves with S-13 teeth on each margin .... 

 Leaves with 3-T teeth on each margin .... 



Leaves with somewhat rounded teeth 



a. Leaves coriaceous, evergreen, entire or rarely spinj- -toothed 

 § 2. Bark dark, furrowed : leaves deciduous, their lobes and teeth acute and bristle-pointed (at 

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

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

 fruit maturing the second 3'ear. — Eryturubal.\nl'S Spach. (Eed 

 or Black Oaks.) /. 

 Leaves pinnatifid or lobed, slender-petioled, not coriaceous, the lobes 

 or teeth conspicuously bristle-pointed g. 

 Mature leaves green on both sides ; species closely related and 

 freely hybridizing h. 

 h. Longest lobes of the leaf about equaling (never t^vice as long as) 



the breadth of the broadish middle portion of the leaf . 

 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 cap 3-5 mm. high, 



1-1.5 cm. broad 



Cups larger. 

 Cups brown or castaneous, the scales finally glabrate and 



lustrous 



Cups ashy with persistent dull pubescence. 

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

 Cup 1.2-1,S cm. broad : acorn O.S-l.T cm. thick 

 i. Upper scales of the cup loosely imbricated 

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



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



Lobes broadly triangular IS. $. 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. 

 Leaves %videning or often much dilated upward and more or less 

 sinuate or 3-5-lobed. 

 Leaves glabrous ; cup saucer-shaped or hemispherical . 

 Leaves rusty-pubescent beneath ; cup turbinate . , 

 Leaves not dilated upward, generally entire. 

 Leaves permanently stellate-pubescent beneath 

 Leaves glabrous or "glabrate beneath 



i- 



11. Q. rubra. 



12. Q.palusiris. 



13. Q. coccinen. 



Q. texann. 



15. Q. ellipsoidalis. 



16. Q. velutina. 



k. 



I'd. Q. nigra. 



20. Q. marilandica. 



21. Q. imhricaria. 



22. Q.pheUos. 



1. (J. dlba L. (White O.) Leaves when young 

 white-lanate beneath, irhen matitre pale or glaucous 

 beneath, bright green above, obovate-oblong, obliquely 

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

 lobes; cup hemispherical-saucer-shaped, rough ortuber- 

 cled at maturity, puberulent, much shorter than the 

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

 upland woods, s. ]\Ie. to Ont., Minn., and southw. 

 Fig. 670. 



2. Q. stellata Wang. (Post 

 O., Iron {).) Leaves grayish- 

 or brownish-downy tinder- 

 neath, dark green and rough 

 above, thickisb, sinuately cut 

 into 5-7 rounded divergent 

 lobes., the upper ones much 

 larger and often IS-notched ; 



(Q. minor Sarg.) — Sandy or 

 sterile soil, Mass. to la.. Neb., and southw. Fig. 671. 



Q. Margaretta Ashe, with narrower small leaves 

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

 siblv a hvl)ri<l of Q. stellata and Q. alba. 



3. Q. iyrata Walt. (Over-cip O.. Swamp Post O.) 

 Leaves crowded at the end of the branchlets, obovate- 

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



acorn 1-2 cm. long. 



