FAGACEAE • SALICACEAE 277 



QIJERCUS— continued 



Acorn more than half enclosed in cup. Hybrid between Cork Oak and 

 Turkey Oak. 



Q. macrocarpa. Burr Oak. 50. Ls. obov., 10, tapering base, 5-7-lobed, 

 terminal lobe much the largest, dark glossy green above, minutely felted 

 below. Acorn cup with thread-like scales forming a fringe. North 

 America. (Fig. 33 c.) 



Q, marilandica. Black Jack. 50. Ls. broadly ov., 6, base rounded, 3-5-lobed 

 at apex, dark glossy green above, at first brownish and hairy below, 

 becoming green and nearly hairless. East United States. (Fig. 33 D.) 



Q. Mirheckii. 100. Ls. ov., obov., 4, coarsely blunt-toothed, slightly heart- 

 shaped base, glossy above, woolly below at first, becoming hairless. 

 Acorn cluster on short stalk. Spain, Portugal, North Africa. 



Q. nigra. Water Oak. 80. Branchlets hairless. Ls. often crowded at end of 

 short twigs, obov., lane, 4, pale green on both sides, lobed or entire, 

 hairless except for tufts of down in vein-axils below, stalk very short. 

 South United States. 



Q. pahistris. Ym 02Lk. 100. Branchlets hairless, warted; buds hairless. Ls. 

 ov., 6, glossy, deeply lobed, the lobes oblong or triangular and toothed 

 near apex, large brown tufts in vein-axils below, long-stalked. U.S.A. 

 (Fig. 33 A.) 



Q. pediinculata (0. Robur). Common Oak. 80. Branchlets hairless. Ls. ov., 

 4, shallowlylobed, lobes rounded, dark green above, greyish below, small 

 ' ears ' at junction with stalk, stalk less than h. Acorn cluster on long 

 slender stalk. Europe (including Britain) and Asia. (Fig. 32 a.) 

 Variety concordia. Golden Oak. Ls. yellow. 



Yarieiy filicifolia. Fern-leaved Oak. Ls. cut into narrow slender lobes, 

 base tapering. 

 Variety purpurescens. Purple Oak. Ls. purple. 



O. Phellos. Willow Oak. 100. Bark smooth, grey. Ls. lane, 5, entire, tapering 



~ base, pale green. Acorn very small, in shallow cup. U.S.A. (Fig. 128 k.) 



Q. rubra. Red Oak. 100. Branchlets hairless, warted. Ls. ov., 9, deeply 

 lobed, lobes obliquely triangular and entire or with a few teeth, terminal 

 lobe long and narrow, dull green above, greyish and downy below, with 

 brown tufts in vein-axils, long-stalked. Acorn cup very shallow. North 

 America. (Fig. 32 D.) 



Q. sessiliflora. Sessile Oak. Durmast Oak. 80. Branchlets downy. Ls. ov., 5, 

 deeply lobed, lobes rounded, dark green above, greyish and somewhat 

 downy below, tapering or rounded base without 'ears,' stalk more than 

 I long. Acorn cluster on short stalk. Europe (including Britain) and 

 West Asia. (Fig. 32 B.) 



Q. velutina. Black Oak. 80. Branchlets downy; buds hairy. Ls. ov., 12, 

 deeply lobed, lobes triangular and entire or with a few teeth, dark green 

 and glossy above, pale and downy below. Acorns solitary, half enclosed 

 in cup. North America. (Fig. 34 A.) 



Family 100. SALICACEAE. Po, A2-30, G (2) 



Ls. alternate, stipulate. Fls. in catkins, usually appearing before Is. Fruit a dry 

 splitting capsule, containing seeds with tufts of silky hairs. 



