340 



FAGACEAE (I'.KKCII FAMILY) 



whitc-tomentose beneath or at length smooth >*h , 

 the lobes triangular to oblong, acute or obtuse, 

 entire or sparingly toothed ; cup round-ovoid, 

 thin, with rugged pointed scales ; acorn about 2 

 cm. long. River swamps, N. J. to Ind., Mo., 

 and southw. FIG. 672. 



4. Q. macrocarpa Michx. (Bun O., OVKK- 

 CCP or MossY-crr ( ). ) Leaves obovate or oblong, 

 lyrately pinnatifid or deeply sinuate-lobed, or 

 nearly parted, sometimes nearly entire, irregular, 

 downy or pale beneath; the lobes sparingly and 

 obtusely toothed, 

 or the smaller ones 

 entire ; cup deep, 

 thick and woody 

 (2-5 cm. across), 

 icith hard and thick 

 pointed conspicu- 

 ously imbricated 

 scales, the upper 



672. Q.lyrata. QM8 '^^ . 



ally making a mossy-fringed border ; acorn broadly 

 ovoid, half immersed in or entirely inclosed by the 

 cup. Rich soil, N. S. to Man., s. to w. Mass., 

 Ky., and Tex. A large and valuable tree ; ex- 

 tremely variable in the size and fringe of the 

 cups. FIG. 673. Var. OLIVAEFORMIS (Michx. f.) 

 Gray is a narrower-leaved form with small sub- 

 cylindric acorns. 



5. Q. bicolor Willd. (SWAMP WHITE O.) Leaves 

 obovate or oblong-obovate, wedge-shaped at base, 

 coarsely sinuate-crenate and often rather pinnati- 

 fid than toothed, usually soft-downy and white-hoary beneath, the primary veins 

 lax and little prominent ; cup -\ as long as the acorn, woody, the upper scales 

 awn-pointed, sometimes forming a mossy-fringed 



margin ; acorn 2-3 



cm. long. (Q. 



platanoides Sud- 



worth. ) Borders 



of streams and 



swamps, s. Me. to 



Ont., Minn., and 



southw. A large 



tree, with flaky 



bark. FIG. (171. 

 0. Q. Michauxii 



Nutt. (BASKKTO., 



Cow O.) Leaves 



oval or obovate, 



acute, obtuse, or 



even cordate at 



base, regularly 



dentate (seldom 



deeply), rather 



rigid, commonly 



tomentose beneath; stamens usually K>; fruit 

 short-ped uncled ; cup shallow, tuberculate with 

 hard and stout acute scales, tips of the inner- 

 most often forming a stiff fringe ; acorn ovoid- 

 subcylindric, twice as high as the cup, about 675. Q. Michauxii. 



678 



macrocarpa . 



674. (I bicolor. 



