654 PROCEEDINGS OF THE ACADEMY OF [Sept., 



flowers are not yet known, I do not hesitate to describe this species, as 

 the A'ery distinct beautiful clear yellow fruit is different from that 

 of any other of the recognized species. It is named for William 

 Darlington (1782-1861), of West Chester, the distinguished Pennsyl- 

 vania botanist and the author of the Flora Cestrica. 



IX.— UNIFLOR^E. 



Leaves crenately serrate I. C. unifiora. 



Leaves with straight teeth, 2. C. smithii. 



1. Crataegus uniflora Muench. 



Hausv., V, 147 (1770). Sargent, Silva N. Am., IV, 117, t. 191. Porter, 



Fl. Penn., 177. 

 Cratcegus parviflora Aiton, Hort. Kew., II, 169 (1789). Watson and 



Coulter, Gray's Man., ed. 6, 166. 



Berks county: Near Kutztown, C. L. Gruber (No. 74), 1902. Bucks 

 county: Near Sellersville, C. D. Fretz (No. 22), May and July, 1899. 

 Delaware county: Lownes' Run, Springfield, B. H. Smith (No. 202), 

 May, 1902 and 1904. 



2. Crataegus smithii Sarg. 



Trees and Shrubs, I, 67, t. .34 (1903). 



Cratcegus vailice Small, Porter, Fl. Penn., 177 (not Britton) (1903). 



Leaves obovate, rounded or acute at the apex, gradually narrowed 

 from near the middle to the concave-cuneate entire glandular base, 

 finely and doubly serrate above, with straight gland-tipped teeth, and 

 occasionally divided into short terminal lobes ; nearly fully grown when 

 the flowers open about the 20th of May and then membranaceous, 

 slightly viscid, bright yellow-green and roughened above by short white 

 hairs, paler, and villose below along the slender midribs, and usually 

 three pairs of thin primary veins extending to the apex of the leaf; at 

 maturity subcoriaceous, very dark yellow-green, lustrous and scabrate 

 on the upper, pale and still slightly hairy on the lower surface, 2.3-3 cm. 

 long and 1.2-2.2 cm. wide; petioles short, wing-margined nearly to the 

 base, villose early in the season, pubescent in the autumn, 4-5 mm. 

 long; stipules oblong and acuminate to lanceolate, glandular, turning 

 brown in fading, caducous. Flowers about 1.6 cm. in diameter, soli- 

 tary or occasionally in 2- or 3-flowered clusters, on short stout villose 

 pedicels; then bractlets linear to oblong, glandular, caducous; calyx- 

 tube narrowly obconic, villose, the lobes foliaceous, broad-ovate, 

 acuminate, conspicuously serrate, with slender teeth tipped with minute 

 red glands, reflexed when the flowers open; stamens twenty; anthers 

 pale yellow; styles 5, or rarely 6. Fruit ripening from the middle to 



