308 



WEEDS AXD USEFUL PLAXTS. 



1. Q>. macrocar'pa, Mx. Leaves deeply and 

 somewhat lyrately sinuate-Iobed, the lobes ob- 

 tuse, spariDgly and obtusely toothed ; acorn 

 very large ; cup hemispherical, fringed above 

 with hard and thick-pointed scales, the upper- 

 most of which are awned ; nut ovoid, more than 

 half immersed in the cup. 

 Large-fruited Quercus. Bur-oak. Over- 

 cup Oak. Mossy-cup White Oak. 



Trunk 40 - 60 feet high . Leaves obovate in outhne, 6-12 

 inches or more in length ; the smaller ones entire. Acorns 

 1-1% inch long, sometimes entirely enclosed in the con- 

 spicuously fringed cup. 

 West New England, west and southwest. 



Ohs. A handsome middle-sized tree with luxu- 

 riant foliage and remarkably large acorns. 

 The wood is valuable for those uses which re- 

 quire stiff and durable wood. As a fuel it 

 takes rank with the White Oak. A variety with 



narrower and more deeply lobed leaves and oblong fruit is the Quercus 

 olivsefor'mis of Michaux. 



2. Q,. obtusi'loba, Mx. Leaves tawny pu- 

 bescent beneath, obovate-oblong, cuneate at 

 base, irregularly sinuate-lobed, the upper 

 lobes larger and often 1 - 3-notched ; acorn 

 roundish ovoid, rather small. 

 Obtuse-lobed Quercus. Barrens White Oak. 

 Post Oak. Rough Oak. 



Stem 20-40 or 50 feet high ; branches irregular, 

 spreading, densely pubescent when young. Leaves 4-6 

 inches long, thick and coriaceous, mostly with 3 un- 

 equal lobes on each side and unequal angular sinuses — 

 the upper surface smoothish and shining (often roughish 

 with short fasciculate hairs, when young), the under 

 surface pale ferruginous, or tawny, and clothed with a 

 stellate pubescence ; petioles about half an inch long. 

 Acorn rather small, oval or roundish-ovoid, with the 

 apex often depressed or umbilicate — the lower half em- 

 braced by the scaly hemispherical cup, which is sessile, 

 or the fruit often in small clusters on a common pe- 

 duncle. 



Dry sterile hills. Massachusetts, west and south. 



Obs. This tree seems to be confined to barren hills, and exposed ridges. 



Fig. 198. The Bur or Over-cup Oak (Quercus macrocarpa). The figures of all the oaks 

 represented here arc less than half the natural size. 



Fig. 199. The Post or Rough Oak (Quercus obtusiloba.) 



