16 



FAGACEAE. 



thium shorter than the body: ripe iuvolucre 3-4 mm. in diameter: nuts usually 

 solitary, 1-1.5 cm. long. — Spr. 



The Chinquapin grows on sandy ridges and swamp-margins in northern 

 Florida. The brown heart-wood is coarse-grained and light, but hard, strong, and 

 durable. (Cont.) 



3, QUERCUS [Tourn.] L. Shrubs or trees, with coarse-grained wood. 



Leaf -blades entire, toothed, or lobed. Staminate aments drooping: calyx 



4-7-lobed: stamens 6-12, the filaments relatively short. Pistillate flowers 



solitary or several : ovary usually 3-celled : stigmas 3, dilated. Mature involucre 



(cup) saucer-lilce or deeper, subtending the nut, or rarely enclosing it. — Spr. 



— Oak. 



Fruit maturing the first year : nut glabrous within : leaf-blades not bristle-tipped. 

 Leaves deciduous : blades lobed or toothed. I- Ai.bae. 



Leaves persistent: blades entire, except on shoots. II. Virginianae. 



Fruit maturing the second year, except sometimes in Q. mijrti- 

 foUa: nut pubescent within : leaf-blades bristle-tipped. 

 Leaf-blades entire or slightly lobed : nuts of a globose type. 

 Leaf-blades pinnatifld or pinnately lobed : nuts of an ovoid 

 type. 



III. Laurifoliae. 



IV. RUBEAE. 



Albae. 



1. Q. alba. 



2. Q. Margaretta. 



3. Q. stellata. 



4. Q. li/rata. 



5. Q. Chapmanii. 



6. Q. MicJiauxii. 



7. Q. Mvhle7ihergiL 



Leaf-blades deeplv and prominently lobed. lyrate or pinnatifld. 



Acorns decidedly longer than wide ; nut protruding at least % beyond the cup 

 Mature leaf-blades glabrous, glaucous beneath : acorn- 

 cup shallow. 

 Mature leaf-blades pubescent beneath : acorn-cup deep. 

 Leaf-blades with rounded upper lobes : acorn-cup 



11-14 mm. wide ; nut 12-14 mm. long. 

 Leaf-blades with truncate or emarj;mate lobes : 

 acorn-cup 15-20 mm. wide; nut 15-20 mm. long. 

 Acorns wider than long : nut immersed in the cup or 

 nearly so. 

 Leaf-blades coarsely toothed or undulately lobed. 



Leaf-blades undulate or undulately lobed. thick-leathery. 

 Leaf-blades coarsely toothed, membranous or thin-leathery. 

 Acorns peduncled : leaf-blades mostly broadened up- 

 ward, copiously white-pubescent beneath. 

 Acorns sessile : leaf-blades mostly narrowed upward, 

 glabrous or inconspicuously pubescent beneath. 



II. Virginianae. 



Acorn-nut of an ovoid type, much less than % included in the cup. 



Leaf-blades smooth or nearly so : acorn-cup hemispheric. 8. Q. virgimana. 



Leaf-blades rugose-reticulate : acorn-cup turbinate. 9. Q. gemmata. 



Acorn-nut of an oblong type, V2 included in the cup. 10. Q. Rolfsii. 



III. Laurifoliae. 

 Leaf-blades glabrous beneath. 

 Leaves persistent. 



Acorn-cup saucer-shaped : leaf-blades short. 

 Acorn-cup hemispheric : leaf-blades long. 

 Leaves deciduous. 



Leaf-blades acute, narrow. 

 Leaf-blades rounded or emarginate, broad. 

 Leaf-blades pubescent beneath. 



IV. Rdbrae. 

 Leaf-blades dilated at the apex. 



Acorn-cup saucer-shaped : leaf-blades glabrous, except the 



vein-axils beneath. 

 Acorn-cup hemispheric : leaf-blades brown-touientose. 

 Leaf-blades not dilated at the apex. 

 Leaf-blades pubescent beneath. 



Acorn-cup saucer-shaped : leaf-blades gray- or white- 

 pubescent beneath. 

 Leaf -blades rounded at the base ; lobes 3-5. 

 Leaf -blades cuneate or truncate at the base ; lobes 

 5-13. 

 Acorn-cup turbinate or hemispheric-turbinate : leaf- 

 blades brown- or rusty-pubescent beneath. 



11. Q. myrtifolia. 



12. Q. laurifoUa. 



13. Q. Phellos. 



14. 0- hyirida. 



15. Q. cinerea. 



10. Q.nUtru. 



17. Q. marylandica. 



18. Q. triloba. 



19. Q. pagodaefoUa. 



20. Q. velutina. 



