284 The Ohio Naturalist. [Vol. V, No. 4, 



— 96 — 



96. Terminal bud absent. 97. 



96. Terminal bud present. 101. 



97. Stipules or stipular scars absent or indistinct. 98. 



97. Stipules or stipular scars present. 99. 



98. Leaf scar very narrow, almost a line, not decvirrent, extending half 



way around the stem; low shrubs or climbers. ROSA. 



98 Leaf scar broad; twigs not glandular dotted; erect shrubs or 



trees. PRUNUS. 



98. Leaf scar broad; yoving twigs glandular dotted; buds usually clus- 



tered at the tip. MYRICA. 



99 Twigs glandular, dark, pubescent; buds globular; low shrubs. 



COMPTONL\. 



99. Twigs not glandular 100. 



100. Buds and twigs very downy, twigs dark brown or black. CYDONIA 



100. Buds and twigs pubescent; twigs light or greenish brown. 



SORBARLV 

 100 Buds downv or pubescent; twigs glabrous or pubescent, grav or 

 brown. RHAMNUS. 



101. Twigs green or yellowish-green, glabrous; internodes very unequal; 



lateral buds minute; small trees. CORNLTS. 

 101. Twigs normally red above and green beneath, glabrous; bark very 

 bitter; some axils with 2 or 3 hairy buds of nearly equal size; 

 trees. AMYGDALUS. 



101. Twigs not green or red and green unless the plants are low shrul)s, 



but gray, brown, black, or reddish. 102. 



102. Bundle scars 5 or more in the broad U-shaped leaf scar; tips of the 



buds quite downv; small trees. SORBUS. 



102. Bundle scars 3. 103. 



103. Leaf scars very nari-ow, often a mere line extending half way or 



more around the stem, not decurrent ; low shrubs. ROSA. 



103. Leaf scars rather broad often decurrent. 104. 



1 04. Leaf scars strongly decurrent at the sides and middle ; bundle scars 



close together, the central one large; shrubs with brown twigs. 



OPUL ASTER. 



104. Leaf scars not decurrent or if so then the bundle scars distinctly 



separated. 105. 



105. Buds elliptic, lanceolate or lance-linear; shrubs. 106. 

 105. Buds ovate or depressed; mostly trees or tree-like. 107. 



IOC). Older bark shreddy; leaf scars somewhat decurrent at the middle 



and sides; l>ud scales very thin, light or dark brown. RlBIiS. 

 IOC). Bark close; buds pale brown or red; leaf scars not decurrent; bud 



scales rather thick; twigs pubescent. ARONL\. 



107. Buds rounded at the apex, often clustered at the tip of the twig; 



twigs glandular dotted. MYRICA. 

 107. Buds rounded at the apex; scales thick; twigs often zigzag; ])lant 



usually with some thorns, not glandular clotted. CRAT^4i;GUS. 



107. Buds pointed; plants sometimes with thorn-like stunted branches, 



not glandular dotted. 108. 



108. Bvids glabrous or slightly pubescent; twigs usually glabrous and 



slender, some shade of black, brown, or reddish, often with 2 or 

 3 axillary buds; some with self-pruning scars. PRUNUS. 



108. Buds downy or strongly pubescent, conical, pungent; twigs gla- 

 brous, mostly yellow-olive; trees with erect growth, the branches 

 not spreading as in most of the apples. PYRUS. 



108. Buds downy or strongly pubescent; twigs strongly pubescent or if 

 glabrous then dark reddish-brown; trees with romided or 

 spreading crowns. MALUS. 



