Ai>cti 10 e 3 f KEY, BASED UPON LEAVES. 11 



h Oblong and with 



i Very shallow saucer-like cup. 



SOUTHERN RED OAK (Quercus Texana). 

 i-' Deep top-shaped cup about half enveloping the acorn. 



HILL'S OAK (Q. ellipsoidal is). 

 h- Subglobose, half enveloped by its deep turbinate cup of closely 



appressed scales SCARLET OAK ( Q. coccinea ) . 



h3 Flattened-globose to almost hemispheric, with shallow saucer-shaped 



or slightly top-shaped cup PIN OAK (Q. palustris). 



f2 Lobes rounded or bluntly pointed and acorns maturing in the autumn of 



the first year; Ivs. 

 g Obovate-oblong, under surface 



li Glabrous, larger lobes long and narrow, acorn about one-third invested 



by the cup WHITE OAK ( Q. alba ) . 



h- White-tomentose, lobes shorter and more triangular; acorn nearly 



enveloped by its thin-edged cup... OVER-CUP OAK (Q. lyrata). 



g- Broad-obovate with 



li 1 or 2 pairs of rounded lobes, the one next the apex much the largest 

 and commonly trucate or with wide sinus at apex. 



POST OAK (Q. minor). 



h- 3 or 4 pairs deeply lyrate pinnatified; acorns generally large with 

 fringed cup BUR OAK ( Q. macrocarpa ) . 



C- M.UX RIBS SEVERAL PALMATELY VEINED; 



d Lea res alternate icith 



e 5-7 deep lobes star-shaped; fr. globose head of capsules. 



SWEET GUM (Liquidaribar 8 tyraciftua ) . 

 e2 3-5 short lobes; b. of leaf-stem enveloping the new leaf-bud; fr. globose head 



of akenes SYCAMORE (Platanus occidentalis ) 



e3 Xct lobed, entire, orbicular-cordate; fr. pod. 



REDBUD (Cercis Canademis] . 



cl- Left res opposite; fr. samaras in pairs united at base. 

 e Large or medium-size trees with rather firm Ivs.; 



f Sinuses rounded at bottom and lobes entire or nearly so; sinuses 

 j? Moderately deep ; Ivs. pale and glabrous bn., without stipules. 



SUGAR MAPLE (Acer Saccharum). 

 - Shallow; Ivs. green and pubescent bn., edges drooping; stipules often 



present BLACK MAPLE ( A. nigrum ) . 



f- Sinuses pointed at bottom and lobes more or less toothed; Ivs. 



g Deeply 5-lobed with narrow sinuses SILVER MAPLE (A. dasycarpum ) . 



g- Moderately 3-5-lobed with wide sinuses; under surface pale and 



h Glabrate; rather thin, subcordate b RED MAPLE (A. rubruni). 



h2 Moderately hairy, especially along the veins, firm, mostly tapering 

 and entire b. obovate-orbicular, small and sometimes without lobes. 



CAROLINA MAPLE (A. Carolinum). 

 h3 Velvety pubescent, thick, wide-orbicular: a southern tree. 



DRUMMOND MAPLE (.4. Drummondii). 



* Small trees or tall shrubs with membranaceous leaves; lobes 

 h Doubly serrate; Ivs. 



