bcd 10 e 3 f KEY, BASED UPON LEAVES. 11 



h Oblong and with 



i Very shallow saucer-like cup. 



SOUTHERN RED OAK (Quercus Texana). 

 12 Deep top-shaped cup about half enveloping the acorn. 



HILL'S OAK (Q. ellipsoidalis ) . 

 h2 Subglobose, half enveloped by its deep turbinate cup of closely 



appressed scales SCARLET OAK ( Q. coccinea } . 



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



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



f 2 Lobes rounded or bluntly pointed and acorns maturing in the autumn of 



the first year; Ivs. 

 g Obovate-oblong, under surface 



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



by the cup WHITE OAK ( Q. alba ) . 



h2 \Yhite-tomentose, lobes shorter and more triangular; acorn nearly 



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



g- Broad-obovate with 



h 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). 



h2 3 or 4 pairs deeply lyrate pinnatified; acorns generally large with 

 fringed cup BUR OAK ( Q. macrocarpa ) . 



<*2 MAIN RIBS SEVERAL PALMATELY VEINED; 



cl Leaves alternate icith 



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



SWEET GUM (Liquidanbar Styraciflita). 

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



of akenes SYCAMORE (Platanus occidentalism 



e3 Not lobed, entire, orbicular-cordate; fr. pod. 



REDBUD (Cercis Canadensis). 



<1 2 Leaves 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 

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



SUGAR MAPLE (Acer Saccharum). 

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



present BLACK MAPLE ( A. nigrum ) . 



f2 Sinuses pointed at bottom and lobes more or less toothed; Ivs. 



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



g 2 Moderately 3-5-lobed with wide sinuses; under surface pale and 



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



h- 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. 



DRUMMOXD MAPLE (A. Drummondii). 



o= Small trees or tall shrubs with membranaceous leaves; lobes 

 h Doubly serrate: lv*. 



