140 CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM. 



5. Quercus maxima (Marsh.) Ashe. Red oak. 

 Low woods. Eastern N. Amer. (Q. riiftra maxima Marsh. ; Q. rwiraof authors, not L.) 

 A tree is shown in plate 22 B. 



6. Quercus coccinea Wang. Scarlet oak. 



Dry woods and hillsides. Northern states, south to N. C. 



7. Quercus illcifolia Wang. Bear oak. 

 Dry ground; near Laurel, possibly not reaching our limits. Northern states, south 



to Md. (Q. nana Sarg.) 



8. Quercus velutina Lam. Black oak. Quercitron. 



Dry woods. Eastern U. S. (Q. iinctoriaMichx.) 



9. Quercus rubra L. Spanish oak. 

 Dry woods. Southern states, north to N. J. (Q. falcata Michx.; Q. triloba Michx.; 



Q. dijitata Sudw.) 



iO. Quercus saulii C. Schneid. Saul's oak. 



Dry woods; frequent in Q. alba and Q. viontana colonies. (Q. prinusXalba of 

 authors; Q. inontanaXalba?) 



Quercus macrocarpa Michx., the bur oak, is sometimes planted within our limits. 

 Native farther north and west. Readily recognized by its lyrate-pinnatifid, obovate 

 or obovate-oblong leaves, 20 cm. long or more; cup hemispheric, 3-5 cm. broad, the 

 upper scales produced into filiform tips; acorns depressed-globose, half covered by 

 the cup. 



11. Quercus stellata Wang. Post oak. 

 Dry woods and barrens. Eastern tJ. S. (Q. minor Sarg.) 



12. Quercus alba L. White oak. 

 Dry woods. Eastern U. S. 



A tree is shown in plate 2.3. 



12a* Quercus alba X stellata? 

 Dry woods, with Q. alba and Q . stellata; perhaps a distinct species. 



13. Quercus bicolorW^illd. Swamp white oak. 

 Low woods and river bottoms. Eastern N. Amer. (Q. platanoides Sudw.) 



The leaves on young growth of this species much resemble those of Q. lyrata. 



14. Quercus prinoides Willd. Scrub chestnut oab . 

 Dry grounds and pine barrens. Eastern U. S. 



15. Quercus montana Willd. Rock chestnut oak. 

 Dry woods and hillsides. Eastern U. S. {Q. prinus of authors, not L.) 



16. Quercus prinus L. Basket oak. 

 Low woods and swampy ground. Southern states, north to Del. {Q. michauxii 



Nutt.) 



17. Quercus muMenbergii Engelm. Chestnut oak. 

 Low places. Eastern U. S. (Q. acuminata Sarg.) 



39. UIMACEAE. Elm Family. 



Leaves of an oval type, narrowed to an unequal base; fruit a winged nut (samara). 



1. ULMUS. 

 Leaves of an ovate type, with a broad rounded unequal base; fruit a drupe. 



2. CELTIS. 

 1. TJLMUS L. Elm. 



Leaves glabrous or nearly so on the upper surface; wing of the samara ciliate, the 

 body glabrous 1. TJ. americana. 



Leaves very rough on the upper surface; wing of samara not ciliate, the Ijody pulses- 

 cent 2. U. fulva. 



