ULMACE^E 



319 



Leaves oblong-ovate, mostly cordate or occasionally rounded at base, entire or 



slightly serrate toward the apex, covered below with pilose pubescence; fruit 



dark reddish brown, the pedicels usually not more than twice as long as the 



petioles. 3. C. Lindheimeri. 



Leaves green on the lower surface, broadly ovate, obliquely rounded at base, entire, 



pubescent along the midrib and veins below, rarely smooth on the upper surface; 



fruit dark orange-red, the pedicels usually not more than twice as long as the 



petioles. 4. C. reticulate. 



Fruit on pedicels shorter or only slightly longer than the petioles. 



Leaves oblong-lanceolate, long-acuminate, unsymmetrically cuneate at base, often fal- 

 cate, entire or more or less serrate, smooth or rarely roughened on the upper sur- 

 face; fruit orange color or yellow, the pedicels shorter or somewhat longer than the 

 petioles. 5. C. laevigate. 



Leaves ovate-lanceolate, acute or acuminate, obliquely rounded at base, coarsely serrate 

 or nearly entire, smooth or in var. georgiana roughened on the upper surface; fruit 

 dark orange red, the pedicels usually shorter than the petioles. 6. C. pumila. 



1 . Celtis occidentalis L. Hackberry. Sugarberry. 



Leaves ovate, short-acuminate or acute at apex, obliquely rounded at base, sharply 

 serrate often only above the middle, thin, slightly pubescent below on the slender midrib 

 and veins early in the season, becoming glabrous or nearly glabrous, 2|'-3^' long, 



wide; turning yellow late in the autumn; petioles slender, glabrous, %'-%' in length. Flow- 

 ers on drooping pedicels; calyx divided usually into 5 linear acute thin and scarious lobes 

 rounded on the back, more or less laciniately cut, and often furnished with a tuft of pale 

 hairs at apex; torus hoary-tomentose. Fruit on stems I'-f' long, ripening in September 

 and October and often remaining on the branches during the winter, subglobose, ovoid 

 or obovoid, dark purple, \' in diameter, with a thick tough skin, dark orange-colored flesh 

 and a thick- walled oblong pointed light brown slightly rugose nutlet; seed pale brown. 



A tree, rarely more than 40-50 high with a trunk usually not more than 2 in diameter, 

 spreading often pendulous branches forming a round-topped head, and slender ridged light 

 brown glabrous branchlets marked by oblong pale lenticels, and by horizontal semioval or 

 oblong leaf-scars showing the ends of three fibre-vascular bundles, becoming darker and in 

 their second or third year often dark red-brown. Winter-buds ovoid, pointed, flattened, 

 about j' long, with three pairs of chestnut-brown ovate acute pubescent caducous scales 

 closely imbricated in two ranks, increasing in size from without inward. Bark l'-l|' 



