330 CUPULIFER^. 



and shining. Acorns numerous, small, on short peduncles. The wood is firm 

 and much used by mechanics. Water Oak. Pin Oak. 



14. Q. Banisleri Mich. : leaves on rather short petioles, obovate-wedge- 

 form, 3 — 5-lobed, entire on the margin, grayish tomentose beneath; lobes 

 setaceously raucronate ; cup subturbinate ; acorn roundish-ovoid. Q. ilici- 

 folia Wilid. 



Dry hills and barrens. Can. to Geor. May. ?2. — Stem 4 — 6 feet high, 

 crooked and much branched. Acorns in numerous clusters on the branches, 

 small. Covers large tracts, called oak barrens, in various parts of INew York 

 and of other states. Bear Oak. Barren Scrub Oak. 



** Fructification annuaZ. Fruit mostly pedunculate. 

 •j- Leaves sinuate-lobed ; lobes not mucronate. 



15. Q, obtusiloba Mich. : leaves oblong, deeply-sinuate-lobed, w^edgeform 

 at base, pubescent beneath ; lobes obtuse, the upper one dilated and retuse ; 

 cup hemispheric ; acorn oval. Q. stellata Linn. 



Sterile grounds. Can. to Flor. W. to Miss, and Ark. May.— A tree 30—50 

 feet high, with straggling irregular branches. Leaves mostly 5-lobed, smooth- 

 ish and shining above, rusty pubescent beneath. Fruit sessile or 2 — 3 together 

 on a short common peduncle. Cup hemispheric, enclosing nearly half of the 

 acorn. The timber is much esteemed in shi^ building, a'nd is supposed in dura- 

 bility and strength to surpass that of any other species of oak except the Live Oak. 



Post Oak. 



16. Q. mao'ocarpa Mich. : leaves deeply and lyrately sinuate-lobed, to- 

 mentose beneath ; lobes obtuse, repand, upper ones dilated ; cup deep, 

 fringed around the margin; acorn ovoid, turgid, more than half immersed 

 in the cup. 



Woods. Near Schenectady, N. Y. On the islands in Lake Champlaiii. Penn., 

 and throughout the Western and Southwestern states. May. — A tree 40 — 60 

 feet high, the branches with a corky bark. Acorns pedunculate, larger than in 

 any other American species. The wood is said to be of an excellent q^uality. 



Over-cup White Oak. 



17. Q. olivceformis Mich. : leaves oblong, smooth, glaucous beneath, 

 deeply and unequally sinuate-pinnatifid ; cup very deep, crenate above ; 

 acorn elliptic-oval, three-fourths enclosed in the cup. 



Hills. " N. Y. to Virg. May. — A tree somewhat resembling the preceding. 

 Michaux credits it to the banks of the Hudson near Albany, but I believe no 

 other botanist has found it there. It has, however, been observed by the late 

 Dr. W. Horton, in Orange county, ]>J. Y. Mossy-cup Oak. 



18. Q. alba Linn.: leaves oblong, pinnatifid-sinuate, paler beneath; 

 segments oblong, obtuse, entire ; fruit pedunculate ; cup deep; tuberculate ; 

 acorn ovoid or oblong. 



Fertile forests. Throughout the U. S. May. — One of the largest and most 

 valuable of the American forest trees, often 80 — 100 feet high, and 3 — 7 feet in 

 diameter. Bark whitish. Leaves pubescent beneath when young. Timber 

 firm and durable, and of great use in ship building and in many other arts. 



White Oak. 



ff , Leaves coarsely serrate or toothed, not lobed. 



19. Q. Prinus Linn. : leaves on long petioles, obovate, acute, pubes- 

 cent beneath, coarsely toothed ; teeth unequal, dilated, callous at the point ; 

 cup deep, attenuate at base ; acorn ovoid or oval. Q. Prinus palustris 

 Mich. 



