FAGACEAE (BEECH FAMILY) 



339 



6. Q. MickausHl. 



. Fruit sessile or on very short peduncles. 



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

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



distinct. 



Leaves with acute or pointed teeth. 



Leaves with 8-13 teeth on each margin . . . . 7. Q. Jfuhlenbtryii. 

 Leaves with 3-7 teeth on each margin . . . 8. O. prinoidet. *- 



Leaves with somewhat rounded teeth 9. O. Prinu*. 



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

 | 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 year. EKYTIIKOHALANCS Spach. (RED 

 or BLACK OAKS.) f. 

 f. Leaves plnnatifid or lobed, slender-petioled, not coriaceous, the lobes 



or teeth conspicuously bristle-pointed ff. 

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



freely hybridizing A. 

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



the breadth of the broadish middle portion of the leaf . 

 A. 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 8-5 mm. high, 



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



j. Cups larger. 



Cups brown or castaneons, the scales finally glabrate and 



lustrous 



Cups ashy with persistent dull pubescence. 

 Cup 2-2.6 cm. broad ; acorn l.S-2.8 cm. thick . . 

 Cup 1.2-1.3 cm. broad ; acorn 0.5-1.7 cm. thick . . 

 <. Upper scales of the cup loosely imbricated .... 

 ff. Mature leaves whitish or prayish beneath with close down. 

 Lobes elongate, at least the terminal falcate . 



Lobes broadly triangular 



/. Leaves entire or with few teeth (or somewhat 8-5-Iobed at summit)- 

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

 18 mm. long) k. 

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



sinuate or 8-5-lobed. 



Leaves glabrous ; cup saucer-shaped or hemispherical . . . 

 Leaves rusty-pubescent beneath ; cup turbinate 



11. Q.rubra. 



18. Q. coccinta. 



, 14. Q. texana. 



, 15. Q. ellipsoidalis. 



. 16. Q. telutina. 



. 17. O.falcata. 



"'">_ Q. aifAfnlin 



20. 



nigra. 

 marilandica. 



t. Leaves not dilated upward, generally entire. 



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

 Leaves glabrous or'glabrate beneath 22. Q. phllo. 



1. Q. alba L. (WHITE 0.) Leaves when young 

 white-lanate beneath, when mature pale or glauccs 

 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. Dryish or 

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

 FIG. 670. 



2. Q. stellata Wang. (POST 

 O., IROX 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-3-notched ; 



acorn 1-2 cm. long. (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- 

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



:1 Q. lyrata Walt. (OVER-CUP O., SWAMP POST O.) 

 .< crowded at the end of the branchlets, obovate- 

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



670. Q. alba. 



