22 A Bud and Twig Key 



ki. Buds broadly ovate obtuse dark 

 brown, outer scales with rusty 

 brown hairs, next scales within 

 covered with thick rusty tomentum, 

 buds one-fourth inch long, oval 

 leaf-scars, twig light grayish or 

 brownish slightly roughened, be- 

 coming darker second year, bundle- 

 scars three, tip-scar not prominent. 

 U. pubescens Walt. 



k2. Buds ovate acute slightly flattened' 

 one-eighth inch long, scales gla- 

 brous bright chestnut brown, leaf- 

 scars oval or semi-orbicular, bun- 

 dle-scars three rarely four, twig 

 reddish brown. Plate VII. 



* U. americana Linn. 

 kj. Buds ovate one-fourth inch long, 

 scales brown slightly pubescent, 

 margin ciliate with soft white 

 hairs, bundle-scars three or four to 

 six in rather irregular line, leaf- 

 scars orbicular or semi-orbicular or 

 triangular, twig light brown gla- 

 brous or minutely pubescent. Plate 

 VII. U. racemosa Thomas. 



J2. Bundle-scars three raised slightly 

 above surface of very small lunate 

 leaf-scar, stipule-scars minute, twigs 

 one-sixteenth inch rarely larger, buds 

 about one- fourth inch long, bud- 

 scales light brown with obtuse apex, 

 twigs red-brown lustrous becoming 

 when about one-half inch diameter 

 dull brown. Plate VII. 



* Ostrya virginiana (Mill.) Koch. 



* Compare Carpinus Carolinian a, Ulmus americana, and Ostrya vir- 

 giniana. 



