330 NEW ENGLAND TREES IN WINTER. 



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

 scar large, inversely triangular; bundle-scars 3-9, conspicuous 



Horse-chestnut (Aesculus Hippocastanum) p.548 



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

 leaf-scars smaller ^5 



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



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



Ash (Fraxinusj 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); leaf-scar almost completely surrounding the bud 



Sycamore (Platanus occidentalis) p.482 



17. Terminal bud present; leaf-scar not surrounding the bud 18 



18. Scar of rudimentary leaf surmounting decurrent ridge on side of 



bud; buds ovate to conical, hairy at least within 



Magnolia (Magnolia) 141 



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



oblong, smooth without and within 



Tulip Tree (Liriodendron Tulipifera) p.474 



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 (Robinia) p.522 



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



.... Prickly Ash (Zanthoxylon americanum) under Comparisons p.522 



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.51Q 



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 



Osagre Orange (Madura pomifera) under Comparisons p.494 



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

 Hawthorn (Crataegus) p.494 



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



Plum (Primus) 1 ^0 



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.486 



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.484 



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

 chambers or by woody partitions 28 



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

 tions 32 



28. Pith chambered but with chambers confined to the nodes 



Hickory (Carya) 101 



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



