196 TREES IN WINTER 



14. Terminal buds large, over 1.5 cm. long, sticky or varnished; leaf- 

 scar larg-e, inversely triangular; bundle-scars 3-9, conspicuous 



Horse-chestnut (Aescuius HippocastanumJ p.414 



14. Terminal buds smaller, under 1.5 cm. long, not sticky-varnished; 

 leaf-scars smaller 15 



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



less confluent; bud-scales scurfy (i.e. rough-downy) 



Ash (Fraxinus) 165 



15. Bundle-scars not minute, generally definitely 3 in number; bud- 

 scales not scurfy Maple (Acer) 155 



16. Stipule-scars entirely encircling the twig- 17 



16. Stipule-scars absent or if present not encircling the twig 19 



17. Leaf-scar almost completely surrounding the bud; terminal bud 

 absent; (the last lateral bud may appear to be terminal but absence 



of terminal bud is shown by small scar at end of twig) 



Sycamore (PlatanusJ p.348 



17. Leaf-scar not surrounding the bud; terminal bud present 18 



18. Buds ovate to conical, hairy at least within; scar of rudimentary 



leaf surmounting decurrent ridge on side of bud 



Magnolia (Magnolia) 142 



18. Buds flattened oblong, smooth without and within; scar of rudi- 

 mentary leaf, if present, at base of bud 



Tulip Tree (Lirioclendron Tulipifera) p.340 



19. Twigs with thorns, spines, or prickles, or branches ending in 

 thorns 20 



19. Twigs without thorns, spines, or prickles 27 



20. Spines in pairs at the nodes, or twigs covered with weak hair- 

 like prickles 21 



20. Spines not in pairs at the nodes, twigs not covered with weak 

 prickles 22 



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

 absent Locust (Rohinia) p.38S 



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



. . . .Prickly Ash (Zanthoxylon americanum) under Comparisons p.388 



22. Thorns lateral, regularly placed on the twig at or near the 

 nodes 23 



22. Thorns terminal 25 



23. Thorns generally branched, situated above the nodes; buds several 



in a longitudinal row, the lower ones covered by the bark 



Honey Locust (Gleditsia triacanthus) p.382 



23. Thorns generally unbranched on twigs, situated at the nodes; 

 sometimes branched thorns on trunk; buds exposed 24 



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



Osa@re Orange (Madura pomifera) under Comparisons p.360 



24. Thorns generally absent from many of the nodes; bundle-scars 3. 

 : Hawthorn (Crataegus) p.360 



25. Terminal bud absent but leaving a terminal scar on twig 



Plum (Prunus) 151 



25. Terminal bud present, at least on spineless branches 26 



26. Tree with bushy habit of growth; twigs with characteristic 

 licorice-like taste, generally reddish-brown, more or less pale- 

 woolly at least toward apex; lateral buds blunt, flattish, appressed 

 and more or less pale-woolly Apple (Pyrus Malus) p.352 



26. Tree with upright habit of growth; twigs without characteristic 

 taste, generally yellowish green and generally smooth; lateral buds 

 sharp-pointed, smooth or sometimes slightly downy, generally not 

 flattened nor appressed Pear (Pyrus communis) p. 350 



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

 chambers or by thin woody partitions (the partitions are fre- 

 quently inconspicuous) 28 



27. Pith continuous; i.e. without hollow chambers or woody parti- 

 tions 32 



