200 TREES IN WINTER 



69, Bundle-scars 3 74 



69. Bundle-scars 4 or more 70 



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



70. Terminal bud present 7I 



71. Lateral buds mostly large, twig without resinous juice; fruit red 

 berry-like; a small tree Mouutuin Ash (Pyrus) p.354 



71. Lateral buds small, cut twig exuding watery, resinous juice; fruit 



small, whitish drupes; a shrub growing in swamps 



Poison Sumach (Rhus Vernixj p.394 



72. Leaf-scars deeply V-shaped, almost entirely surrounding the 

 buds 73 



72. Leaf-scars, inversely triangular to heart-shaped, large, not more 

 than half surrounding the bud; twigs stout; pith chocolate-brown. 

 Ailanthus (Ailanthiis glandulosa) p.SOO 



73. Pith yellowish-brown; twigs stout, exuding a milky juice when 



rro ^II ••{■■:■' \: . •,•••, Sumach (Rhus) 153 



73. Pith whitish; twigs slender, without milky juice 



Yellow Wood (Cladrastis luteaj p.386 



74. Terminal buds on rapidly grown shoots absent, but leaving a ter- 

 minal scar g3 



74. Terminal buds present 75 



75. Lateral buds flattened, appressed, about as broad as long 76 



75. Lateral buds not distinctly flattened and appressed, in most cases 

 longer than broad 78 



76. Terminal bud large, generally 12 mm. or more long; some of the 

 lateral buds generally long, nearly equalling terminal bud; leaf- 

 scars raised on dark red, polished ridges of the bark 



Mountain Ash (Pyrus) p.354 



76. Terminal bud smaller, generally under 8 mm. long; all lateral 

 buds small; leaf-scars not on specially colored ridges of the bark 77 



77. 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, more or less pale-woolly. 

 Apple (Pyrus Malus) p.352 



77. 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 



Pear (Pyrus communis) p.350 



78. Buds spherical or nearly so, seldom pointed; bud-scales thick, 

 shining; leaf-scars narrow; twigs more or less zigzag, branches 



generally thorny; fruit a small pome; small trees or shrubs 



Hawthorn (Crataegus) p.360 



78. Buds not spherical; bud-scales thinner 79 



79. Leaf-scars narrow crescent-shaped, generally several times as 

 broad as high 80 



79. Leaf-scars semicircular to broadly crescent-shaped, seldom as much 

 as 3 times as broad as high 81 



80. Buds long, narrow, elliptical, 3-4 times as long as wide 



Shad Bush (Amelanchier canadensis) p.358 



80. Buds conical, stout Pear (Pyrus communis) p.350 



81. Twigs densely speckled with very minute pale dots, brightly 

 colored, generally green-yellow below and more or less reddish 

 above and highly polished; buds generally densely downy at least 



toward apex; collateral buds usually present 



Peach (Prunus Persica) p.378 



81. Twigs not densely speckled with minute dots; buds not densely 

 downy, collateral buds generally not present 82 



82. Twigs without bitter taste; branchlets generally becoming corky- 

 ridged; bud-scales downy-margined; leaf-scars large with con- 

 spicuous bundle-scars; fruit a spherical bur-like head generally 

 present in winter Sweet Gum (Liquidamhar Styraciflua) p.346 



82. Twigs with bitter taste often resembling bitter almonds; branches 

 without corky ridges; bud-scales not downy-margined; fruit a 

 drupe Cherry or Plum (Prunus) 145 



