330 xi^w i:y(.iLAXD tuees ix wixter. 



14. Terminal buds larg-e. over 1.5 cm. long", sticky or varnished; leaf- 



srar lar£.-e, inverselv triang-ular; bundle-sears o-9. conspicuous 



.' . Horse-ehestnut (Aesciilus HippocastanionJ i>.54.S 



14. Terminal buds smaller, under 1.3 cm. long:, not sticky -varnished; 

 leaf-scars smaller 15 



15. Bundle-scars, minute, numerous in a U-shaped line often more or 



less ccnlluent; bud-scales scurfy (i.e. mugrh-downy ) 



Ash ( Fraxiyius) 164 



15. Bundle-scars definitely 3 in number; bud-scales not scurfy 



Maple (Acer) 155 



16. Stipule-scars entirely encircling the twig- 17 



16. Stipule-scars when present not encircling- the twig- 19 



17. Terminal bud absent; (the last lateral bud may appear to be ter- 

 minal but absence of terminal bud is shown by small scar at end 



of twig: I ; leaf-scar almost completely surrounding- the bud 



Sycamore (Platanus occidentalis) i>.4S2 



17. Terminal bud present; leaf-scar not surrounding the bud IS 



IS. Scar of rudinnentary leaf surmounting decurrent ridgre on side of 



bud; buds ovate to conical, hairy at least within 



Mag:nolia (Magnolia) 141 



IS. Scar of rudimentary leaf if present at base of bud; buds flattened 



oblong", smooth without and -within 



Tulip Tree ( Liriodendron Tulipifera) p.47-1 



T"\vig:s "witli thorns, spines, or prickles, or branches en dins 



thorns 



T\vigs "U'ithout thorns, spines, or prickles 



Spines in pairs at the nodes, or t wig's c^"'^"ered -with \veak hair- 

 like iirickles 21 



Spines not in pairs at the nodes, twig-s not covered with weak 

 prickles 22 



Buds rusty-hairy, more or less covered by bark; terminal bud 



absent Locust (Robinia) p. 522 



Buds, red, exposed; terminal bud present; a shrub 



.... J'rickly Ash (Zanthoxylon arnericanuni) under Comparisonsp.r>22 



Thorns lateral, reg:ularly placed on the twig: at or near the 



nodes -3 



Thorns terminal 2o 



Thorns g-enerally branched, situated above the nodes; buds several 



in a long-itudinal row. the lower ones covered by the bark 



^. Houey Locust (Gleditsia triacanthtis )it,iilQ 



Thorns generally unbranched on twig-s. situated at the nodes; 

 sometimes branched thorns on trunk; buds exposed 24 



Thorns generally present at all the nodes; bundle-scar single 



Osag-e Orang-e (MacJura pomifcra) under Comparisonsp.494 



Thurns generally' absent f roni many of the nodes; bundle- scars 3. 

 HaM'thorn (Crataegus) p.494 



Terminal bud absent but leaving a terminal sear on twig" 



Plum fPniniis) 1 50 



Terminal bud present, at least on spineless branches 26 



Tree with bushy habit of growth; twigs witli characteristic 

 liciirice-like taste, genera 11 >" reddisli-l.irown. more or less pale- 

 woolly at least toward apex; lateral b^ids blunt, tlattish. appressed 



and metre or less pale-"woolly -\pple (Pi/rns Mains) p.480 



Tree with upright habit of growth; twigs without characteristic 

 taste, generally yellowish green and generally smootli; lateral buds 

 sharp -pointed, smooth or sonietimes slightly' do-wnj', generally not 

 flattened nor appressed Pear (Pprus co>nt)ninis) P-4S4 



Pith in section lengthwise of twig" seen to be interrupted by hollow 



chamljers or by woody partitions .' 2S 



Pith ci'Ut inuiius; i.e. "^vithout hollow clianibers nr won<ly parti- 

 tions .' .'^2 



Pith cliambered but with chambers confined to the nodes 



Hickory iCarud) 101 



Pith when chambered with chambers not confined to the nodes.. 29 



