131 



KEY TO THE SPECIES BASED PRIMARILY ON LEAVES AND FRUIT. 



Page. 

 1. Leaf blades or their lobes bristle-tipped; aeorDs CDaturing at end of the second season: 

 nuts often pubescent within, 2 



1. Leaf-bladts or their lobes or teeth witJiout bristle tips; acorns maturing at end of 



the fir>>t season; nuts often glabrous within, 10 



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



2. Leaf-blades pinnatifid, plnnately-lobed or dilated at apex, 4 



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



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



4. Leaf blades pinnatifid or pinna telylobed 5 



4. Leaf-blades dilated at apex; ol>ovate brown tomentose on lower surface. Q. marilandica 145 



6. Leaf -blades green on both upppr and lower surfaces 6 



6. I^af -blades pubescent on lower surface, 8 



6. Lobes of leaf-blades alwut e<iual the width of the middle portion or body of the 



leaf 4. rubra 139 



6. Lcbes of leaf-blades 2-G 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. coccinea, 141 



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



8. L£af-blades gray or v.-htte 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 Ave in number; small tree or 



shrub Q. ilicifolia 144 



10. Leaf -blades deeply lobed 11 



10. Leaf-blados 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-bladet- 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 crcnate terminal lobe; upper scales of acom-cup awned with a 

 heavy fringe, Q. maorocarpa 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 abore the middle, oblong to oblong obovate. pointed to 



rounded at apex, seldom exceeding six inches in length, 15 



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



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



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

 stalked a. bioolor 135 



15, Shrub or stnaU tree; bark on small branches smooth; acorn sessile Q. prinoides 13S 



