12 A Bud and Tzvig Key 



ds. Bud at end of twig small nearly conical glabrous 

 red or greenish, leaf-scar encircles bud, one scale 

 visible, stipule-scar extends completely around twig 

 as one continuous line, bundle-scars about eight 

 in a U-line, twig medium size, no terminal bud, tip- 

 scar distinct. Plate IV. 



Platanus occidentalis Linn. 



d$. Terminal bud spatulate glabrous greenish red, leaf- 

 scar orbicular, two valvate bud-scales ; stipule-scars, 

 encircling twig as a continuous line, meet forming 

 a notch ; bundle-scars ten scattered, twig medium 

 size. Plate IV. 



Liriodendron tulipifera Linn. 



d4- Terminal bud long lanceolate sharp pointed, many 

 scales light brown glabrous or pubescent at apex, 

 leaf-scar somewhat crescent-shaped or elliptical, 

 stipule-scars not a. continuous line, one ends above 

 the other, bundle-scars about six scattered, twig 

 small glabrous reddish-brown. Plate IV. 



Pagus atropunicea (Marsh.) Sudworth. 



C2. Stipule-scars distinct but small. 



di. Pith white chambered, buds small brown slightly 

 pubescent flattened against twig, stipule-scars min- 

 ute, bundle-scars three, often united into one line, 

 twigs small glabrous or pubescent, no terminal bud, 

 tip scar not prominent. Plate IV. 



* Celt is occidentalis Linn. 



d2. Pith solid. 



ei. Buds ovate clustered at end of twig, bud-scales 

 many chestnut brown, bundle-scars many scat- 

 tered, pith somewhat five-angled, terminal bud 

 present, stipule-scars distinct. 



f Quercus Linn. 



* Compare Morns rubra. 



f The descriptions of the Oak twigs given here are taken from Sar- 

 gent, "Silva of North America." 



