of the Southern States 2 93 



Ptelea serrata is not closely related to any described species. It 

 differs from the other species in the sharply acute or acuminate and 

 sharply serrate blades of leaflets and the obovate samaras with their 

 acute bases. 



The specimens on which the species is founded were collected 

 by the writer on Stone Mountain, Georgia on July 3, 1893. Type 

 in the herbarium of Columbia University. 



4. Ptelea microcarpa sp. no v. 



A shrub 1.5-3 m. tall, with branching stems and glabrous 



foliage. Leaflets 3 ; blades firm, elliptic, oval or oblong -lanceo- 



v. 



late, 4-10 cm. long, bluntly pointed or acutish, often slightly 

 acuminate at both ends, entire or nearly undulate, slightly paler 

 beneath than above, the terminal one not conspicuously narrowed 

 at the base : panicle many-flowered : samaras suborbicular or or- 

 bicular-obovate, 8-1 1 mm. in diameter, or rarely larger, rounded 

 or truncate at the base, the wings slightly crisped, the body pitted. 



On limestone or granite ridges, Tennessee, Georgia and Ala- 

 bama. Spring. 



Ptelea microcarpa is most closely related to P. serrata, but 

 differs in the firmer longer entire or merely undulate blades of 

 the leaflets, and the samara with its pitted body, and the wing 

 which is rounded or truncate at the base. 



The original specimens were collected by officers of the Bilt-^ 

 more Herbarium (no. 443 7 b ), at Nashville, Tennessee, August 9, 

 1897. The type is in the herbarium of the New York Botanical 

 Garden. 



5. Ptelea trifoliata L. 



An aromatic shrub or tree sometimes 8 m. tall, the foliage 

 glabrous or sometimes densely pubescent. Leaflets 3 ; blad 



^p 



ovate, oval, elliptic, oblong, oblong-lanceolate or oblanceolate, 

 4-12 cm. long, acute or acuminate, entire or sometimes undulate 

 or partially crenulate : panicles many-flowered: sepals ovate, 1.5 

 mm. long, obtuse : petals narrowly oblong, 4-5 mm. long : sam- 

 aras suborbicular or oval-orbicular, 2-2.5 cm - l° n g> rounded or 

 notched at the base. 



In rich soil and on river banks, Long Island to Ontario, Min- 

 nesota, Florida and Texas. Spring. The form with pubescent 

 foliage is Ptelea trifoliata mollis M. A. Curtis and is most common 

 in the Gulf States. 



