STOiaiS AGUICULTUIUL i:xrERIMENT STATION. 383 



56. Buds sunken, rarLiaily or completely covered bv Llie bark, for the 

 most part minute and superposed; best seen in a section length- 

 wise of the twig-, through the m.de at right angles to the surface 

 of the leaf-scar (37 



56. Buds not sunken and generally not superposed 59 



57. Twig-s very stout, generally 1 cm. or m<.re thick: pith salmon- 

 colored; buds bronze-silky, exposed but surrounded bv an incurved 



downy rim of the bark: bundle-scars generally more than Z 



Kfiidieky ColVee Tree (Gi/iiinocladus (Hoica)v.^>14 



57. Twigs rather slender generally less than 5 mm. thick; pith whitish 

 not salmon-colored; bundle-scai's :i 5S 



5S. Buds smooth, distant, the uppermost breaking througli the bark 

 above the leaf-scar, the lower ones submerged, appearing in sec- 

 tion of twig as separate green dots 



Honey l^oeust (Gleditsia triaconthusJit.TilG 



5S. Buds downy, clustered together in cavity lielow leaf-scar 



Locust ('Iiohi7iia)it.o'22 



59. Bud-scale one. large cap-like, terminal bud absent 



AVillow (^aljj:) i>.3,S4 



59. Bud-scales more than one or bud-scales absent; terminal bud 

 present or absent GO 



60. First scale of lateral bud directly in front (i.e. facing directly out 

 away from twig); leaf-scar co\'ered with a light-corky layer, large 

 inversely triangular; bundle-scars ;.!. often compound; pith more 

 or less 5-p(dnted star-shaped Poplar (Populns) 96 



60. First scale of lateral bud not directly in fmnt 61 



61. T^vigs branching freely the fii'st season, the branches surpassing 

 the main axis in length 62 



61. Twigs generally not branching the tirst sea-'-'on or if branching then 

 branches not surpassing main axis in length 63 



62. Bundle-scar one; t"\vigs greenish, siiicy. mm ilaginous \\'hen che\ved. 

 SiiNHiifrns f'.S'n.s'.V((/rrts vdriifoliittii) ii.47G 



62. Bundle-scars ?>, twigs not mucilaginous Alter- 

 nate-leaved I>oiLiAvootl (Cornus alte mi folia) under Conu)arisons i>.r>52 



63. Bundle- scars 1 or 2 ; leaf -scars, except on \'r)ung shoots, mainly 

 densely clustered on short, struit, wart-like branches 64 



63. Bundle-scars 3 or more 65 



64. Bundle-scar single; leaf-scars minute, scattered leaf-scars also 

 present on twigs, ^"ery numerous and stri.ingd>' decurrent ; twigs 

 slender; fruit a cone, generally present IjarcU (Larix) 90 



64. Bundle-scars 2; leaf-scars larger, scattered leaf-scars if present 

 relatively far apart and not decurrent; t^vigs stouter; fruit a stone- 

 fruit generally absent OiiiUgo (Ginkf/o triloba) i».;ss:i 



65. Bundle-scars ?, or nn")re in a sini/lc cur\'ed line 69 



65. Bundle-scars more than 3, variously grouped or scattered, but not 

 in a single line 66 



66. Stipule-scars absent; terminal bud present I'S 



66. Stipule-scars present; terminal bud present or absent 67 



67. 2-3 bud-scales visible; bundle-scars not projecting; terminal bud 

 present or generally absent. Chestnut (Castanea dentata) ik-430 



67. 4 or more bud-scales ■\-isible: bundle-scars projecting; terminal 

 bud absent :^riill>erry (MorusJ 140 



68 Buds large; twigs without resinous juice; fruit a nut; a tree 



Hickory (Carya) 101 



68. Buds small; twigs with resinous juice; fruit a small white drupe; 

 a shrub growing in swamps. I*oisou Sumach (Rhus Vernix) j>.."2S 



69. Bundle-scars 3 J4 



69. Bundle-sears 4 or more "^"J 



70. Terminal bud absent, but leaving a terminal scar on twig 72 



70. Terminal bud present '1 



71 T^ateral buds mostlv large, twig without resinous juice; fruit red, 

 berry-like; a small tree 3Touiitnin Ash (Pyrus)vASH 



