34*2 NE"\V EXGLAXD TREES IX ^VIXTER. 



153. Leaf-scars narrow. V-shaped, nearly encircling' the buds; cut twig- 

 showing milky juice 154 



l."3. Leaf-scars broader; inversely triangular to broadly crescent- 

 shaped; twig with watery juice and resinous taste 



D-\vart" Sumaeli (Ehus copaUinaj under Comparisons p. 520 



l-'4. Twisrs denselv hairv Stag-born Sumach (Ehus ti/iihina)p.o2Q 



154. Twigs smooth 



Snioolh Suniafh (Elius gJahraj under Ci.imparisons p.o2<> 



THE MAPLES 

 Acer. 



Leaf-scars opvu^site. narro^v U or A'-shaped: blindle-srars conspicuous, 

 typically 3. e<iuidistant, tln:>ui§h sometimes eacli of these becomes 

 compounded: fruit winged, in pairs. 



155. Adjacent ed.sres of leaf-scars meeting and prolons^ed upward into 



a conspicuous tooth lof> 



155. Adjacent edg'es not meeting", therefore nut fca'miug' a totith ,,,, l.'iS 



1.7i6. Buds white-downy, collateral buds generally present, twigs gener- 

 all>- with a bloom Box KIder (Acer Xegundo >p.o4^ 



15G, Buds smooth, collateral buds neyer present, twigs without 

 bloom 157 



157, Buds T^'ith onl>' one jjair of scales visible, older branchlets white- 

 streaked Sfriiied Maple (Acer pennsylvanicuin Hi^^S'i 



157. Buds witli se\"eral pairs of scales \isible. branchlets not wtiite- 

 streaked Aorivay 3raple f.-icer platanoides i p.oA'i 



15S. Outer sin.gle pair of bud-scales equalling the bud in length, their 

 edges meeting and enclosing the bud, therefore generall\- only one 

 pair of scales yisible: pith brown; shrubs or at the most small 

 trees 15» 



15S. Outer pair of scales shnrter than bud, their edges not meeting, 

 therefore several [.airs of scales visible; trees 16i> 



159, Buds and twigs stout, smooth; young bark with longitudinal white 

 litres Striped 3Iaple (Acer pcnnsi/lranicitui p.TiSZ 



159. Buds and t«-igs nnu-e slender, bi.th buds and twigs white-downy, 

 white lines absent from baik. :trouutaiu Maple C.4cer spicaf iim /p.53-1- 



160. Buds brown, narrow, sharp-pointed, generallv 4-S pairs of closely 



over-lapping scales \isible. collateral buds absent 



Suaar 31aple f'.-lcer sacchannn )p.o3& 



IbU. Buds red or green, broader, blunt-pointed, fewer scales visible 161 



161. Terminal buds small, red, generallv under 5 mm. long and not 

 distinctly larger than lateral buds; collateral buds generallv 

 present; pith pink; native trees 162 



161. Terminal buds large, stout, generallv over 5 mm, buig and gener- 

 ally distinctly larger than lateral buds; collateral buds never 

 present; European trees 16J 



162. Broken twigs with rank odor, bark falling away in large, thin 



,co flakes on old trees Silver Jraple I'Acer saccharinum )p.53.f 



16-. Broken twigs without rank odor, bark rough on old trees but gen- 

 erally not flaking in large thin scales 



Red JIuple f-lccr rubrumj p. 540' 



163 



Buds red. inner scales covered with rustv wool; adjacent edges of 



leaf-scars meeting and forming a slight proiection; bark "close- 



1,'t "''fea' not flaky >orTTay Slaple ^icer ;);ofcii!oif;es.p.542 



lb„. Buds green, inner scales white-woollv, edges of leaf-scars not 



meeting; bark flaking off in squarish scales 



Syeamore Maple (Acer Psc udu-PlatannsJ p.34-1: 



