131 



iEY TO THE SPECIES BASED PRIMARILY ON LEAVES AND FRUIT. 



Page. 



1. Leaf -blades or their lobes bristle-tipped; acorns maturing at end of tiie second season; 

 nuts often pubescent within, , 2 



1, Leaf-bladrs or their lobes or teeth without bristle tips: acorns maturing at end of 



the first season; nuts often glabrous within, 10 



2, Leaf-blades entire; rarely lobed or toothed except on vigorous coppice shoots 3 



2. Leaf-blades pinna tifid, pinnately -lobed or dilated at apex 4 



S. Lower surface of leaf -blades glabrous Q. phellos 147 



3. Lower surface of leaf-blades pubescent, Q. imbricaria 146 



4. Leaf- blades pinnatifid or pinnately-lobed, 5 



4. Leaf -blades dilated at apex; obovate brown tomentose on lower surface, Q. marilandica 145 



5. Leaf -blades green on both upper and lower surfaces, 6 



5. Leaf-blades pubescent on lower surface, 8 



6. Lobes of leaf-blades about equal the width of the middle portion or body of the 



leaf Q, rubra 139 



6. Lcbes of leaf-blades 2-6 times as long as the breadth of the narrowest portion or 



body of the leaf 7 



7. Trunk continuous, covered by short, slender, often horizontal lateral branches; acorn- 



cups saucer-shaped, Q. palustris 140 



7. Trunk usually branched; covered by rather long, usually stout and ascending lateral 



branches; acorn-cups top-shaped, Q, cocoinea. 141 



S. Leaf-blades brown or rusty pubescent on lower surface; inner bark yellow, Q. velutina. 142 



8. Leaf -blades gray or white pubescent on lower surface; inner bark not yellow, 9 



9. Lobes of leaf -blades long and lanceolate, often scythe-shaped; large tree, Q. falcata 143 



P. Lobes of leaf -blades short and triangular, usually five in number; small tree or 



shrub, Q. ilicifolia 144 



10. Leaf -blades deeply lobed 11 



.0. Leaf -blades coarsely toothed, 13 



11. Mature leaf -blades glabrous and pale on lower surface; cups shallow, Q. alba 132 



11. Mature leaf-blades pubescent on lower surface; cup encloses at least one-third of 



nut 12 



12. Mature leaf-blade?- rusty-pubescent below; leaves usually 5-lobed; stellate pubescent 



above with three terminal large rounded or squarish lobes; upper scales of acorn- 

 cup not awned, Q. stellata 133 



12. Mature leaf -blades white tomentose beneath; leaves usually 5-7-lobed with single 



large oval and crenate terminal lobe; upper scales of acorn-cup awned with a 

 heavy fringe, Q. macrooarpa 134 



13. Leaf-blades broadest at or below the middle, oblong to lanceolate, decidedly pointed at 



apex, usually exceeding six inches in length 14 



13. Leaf-blades broadest above the middle, oblong to oblong obovate, pointed to 



rounded at apex, seldom exceeding six inches in length 15 



.4. Leaf-blades with acuminate apex; slender petiole; acorn sessile, Q. Muhlenbergii 136 



14. Leaf -blades with acute apex; stouter petiole; acorn stalked, Q. Prinus. 137 



15. Tall tree; bark on small branches^ often peeling off in dark scales; acorns long- 



stalked, ' Q. bicolor 135 



15. Shrab or small tree; bark on small branches smooth; acorn sessile Q. prinoides 138 



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