134 Trans. Acad. Sci. oj St. Louis. 



(Bot. Zeit. 1874, p. 47; Just, ii, p. 548). There is considerable 

 literature relating to twigs but this is outside the subject 

 treated in this paper. 



Asimina triloba, Dunal. Buds naked, protected by the two 

 outer, boat-shaped, dark ferruginous, silky leaves which in- 

 crease but slightly in size as the bud opens, and never assume 

 the typical shape. Inner leaves conspicuously 2-ranked, each 

 successively inclosing the remainder of the bud. The flower 

 buds are lateral, globose. May 3d. 



Menispermum Canadense, L. Scales about 5, rounded to 

 elliptical, smooth. Internodes above these elongating; young 

 stem and leaves gray-villous. First leaf undeveloped, several 

 cleft at apex, others normal. Vernation straight. Leaf-scars 

 circular, concave. Buds 2 or 3 superposed, the upper just 

 above the scar, the others bursting through a V-shaped crack 

 in the leaf scar. May 6th. 



Tilia Americana, L. Bud scales 2, the inner larger. 

 Leaves well developed, each covered by its two large stipular 

 scales. Vernation conduplicate. Apr. 30th. 



Xanthoxylum Americanum, Mill. Buds low ; scales two 

 pairs, the outer pair short and dark brown, the bases of the 

 scales joined by a circle of reddish brown fuzz ; inner pair 

 longer and their tips reddish brown with a similar pubescence. 

 First leaf usually abnormal or abortive with two or three 

 leaflets of unequal development, the later leaves successively 

 better developed. Vernation of leaflets revolute, the leat 

 wrapping around the central cone. Apr. 29th. 



Celastrus scandens, L. Buds perpendicular to axis of plant. 

 Scales numerous, the two outer gray, like the bark, with a 

 ridge on the back at the apex ; the inner with brown tips and 

 green bases gradually passing into leaves. Vernation involute. 

 Apr. 29th. 



Euonymus airopurpureus , Jacq. Scales opposite, two pairs . 

 First pair of leaves small and deciduous. Vernation involute. 

 Apr. 20th. 



Ceanothus Americanus, L. Scales two to four, being rudi- 

 mentary leaves with the stipules broadened and adnate to the 

 much reduced blade. First leaf typical in form with two 

 narrow hairy stipules. Vernation involute. Apr. 23d. 



