124 FLOBA OF PHILADELPHIA. 



17. QuERCUs MACROCARPA Michx. Bur Oak, Mossy-cup Oak. M. p. 336. 



Eich soil, cultivated. Spring. 



Philadelphia— Bartram's Garden, Wissahickon (Je.). Montgomery— 

 Chelten Hills (Te.). Detaware— Lansdowne (Pe.). Northavipto7i—{P.). 



Atlantic— YentnoT (Gi.). 



New Castle— One tree between Broome and Eodney streets near Lover- 

 ing Avenue, Canby. 



18. QuERCus PLATANOiDES (Lam.) Sudw. Swamp White Oak. M. p. 336. 



Borders of streams and swamps. Spring. 



Philadelphia— Washington Square (Je.). Bv^ks—'Rock Hill (Pr.), 

 Argus (Ke.). Mowi^o mer-^/ — Shannonville (Cr.), Edge Hill (Me.). 

 Delaware— Concord (W. Tr.), Tinicum (B. Sm,). Chester— WJRistoTNn 

 Twp. (Pr.), Pocopsin (St.). Lancaster— York Furnace (Ke.). Lehigh 

 — Salsburg (Kr.). Northampton — Easton, Porter (B. C). 



Burlington — Moorestown (Br.), Marleton (C), Medford (St.). 

 Gloucester— Near Mickleton (He.), Swedesboro (Li.). SoZem— Riddle- 

 ton (Wa.). 



Netv Castle — Richardson's, Red Clay Creek. Scarce. 



19. QuERCus MiCHAUXii Nutt. Basket Oak, Cow Oak. M. p. 336. Moist 



soil. Spring. 

 Burlington — Moorestown (Br.). 

 New Castle— J. Woodward's woods, Commons. 



20. QuERCUS Prinus L. Rock Chestnut Oak. M. p. 336. Rocky banks 



and hillsides. Spring. 



21. QuERcus ACUMINATA (Michx.) Houda. Yellow Oak, Chestnut Oak. M. 



p. 336. Dry soil, especially limestone ridgess. Early summer. 



Philadelphia — Center Wissahickon (Je.). Bucks — 'Near Sellersville 

 (Fr.). C'^es^er— Valley Forge (St.). Lancaster— (P.). Northampton — 

 Easton, Porter (B. C). 



Gloucester— MnWica Hill (C), near Mickleton (He.). Cumberland — 

 Bridgeton (C). 



Neiv Crtst/c— Serpentine, Centerville, Commons; Brandywiue Hills. 



22. QuERCUs PRiNOiDEs WUld. Scrub Chestnut Oak. M. p. 336. Dry 



sandy or rocky soil. Spring. 



B-wcfcs — Nockamixon (Fr.). Detoware — Williamson (Ja.), Marple 

 (B. Sm.), Castle Rock (VP.). Chester— Serpentine Barrens near West- 

 town (Le.). Lancaster — (P.). 



Northampton — Easton, Porter (B. C). 



New Jersey— Common. 



New Castle— 'Near Wooddale, Christiana. Rare. 



Order 0. URTIOALES. 



Fruit not an achene (except in Humulus and Cannabis) : trees, shrubs, 

 or herbs, ovule pendulous. 

 Trees with alternate leaves, sap not milky. Fam. 1. Ulmaceae. 



Trees with alternate leaves and milky sap or opposite leaved herbs, 

 or herbaceous vines. Fam. 2. Moraceae. 



Fruit an achene; herbs with small clustered greenish flowers; ovule erect 

 or ascending. Fam. 3. Urticaceae. 



