CUPULIIEKiE. 



SILVA OF NORTH AMEPiICA. 



15 



Oblong or obovate, deeply lobed with broad rounded sinuses, the slender 

 lobes coarsely repand-dentate toward the apex 



Ovate or obovate, slightly or deeply lobed with broad or narrow nearly 

 entire or dentate lobes, usually pubescent on the lower surface 



Oblong or obovate, deeply lobed, the lobes tapering, acute, or broad and 

 obovate at the apex, repand-dentate or entire, glabrous or pubescent on 

 the lower surface 



Oblong-obovate or triangular, deeply lobed with acute spreading often 

 falcate lobes, glabrous or rusty-pubescent on the lower surface . . • 



Oblong or obovate, fulvous or pale pubescent on the lower surface, the 

 lobes usually elongated and falcate 



Obovate, sinuate-lobed by deep wide sinuses, the spreading lobes acute or 



36. Q. coccixEA 



37. Q. VELUTINA 



38. Q. Califorxica 



39. Q. Catp:sb.ei 



40. Q. DIGITATA. 



obtuse, usually coarsely repand-dentate 41. Q. palustris 



Obovate, mostly acutely 5-lobed, coated on the lower surface with pale 



pubescence 42. Q 



xaxa 



Oval or obovate, glabrous, sinuately lobed with usually acute entire lobes . 43. Q. Georgiana 

 Widening upward, and often abruptly dilated at the broad, sinuate or ob- 



scurely 3 to 5-lobed apex. 



Broadly obovate, rusty-pubescent on the lower surface 



Obovate-spatulate or narroAvly wedge-shaped, glabrous 



Oblong or lanceolate-obovate, usually entire. "Willow Oaks. 



Glabrous, dark green and lustrous above, somewhat paler below . . . 

 Pale blue-green and glabrous above, coated below with hoary tomentum 

 Dark green or lustrous on the upper surface, pubescent on the lower - 



44. Q. Marilandica 



45. Q. NIGRA. 



46. Q. LAURIFOLIA. 



47. Q. BREVIFOLIA. 



48. Q. IMBRICARIA. 



Glabrous, narrowed at both ends 49. Q. Phellos. 



Pasania. Pistillate flowers in 3-flowered cymes at the base of the erect androgynous aments ; 

 abortive stamens as many as the calyx-lobes ; stigmas linear. 



Leaves persistent. 



Oblong, entu^e or dentate, tomentose on the lower surface 



50. Q. DEXSIFLORA. 



