1910.] NATURAL SCIENCES OF PHILADELPHIA. 153 



September 16, 1905; (No. 45) May 29, August 1 and September 25, 

 1905, May 25 and 26, 1906. 



From Crataegus crus-galli Linnaeus this plant differs in its thinner 

 leaves with more prominent veins, in the pink, not dark rose-colored, 

 anthers and in the size and shape of the fruit. Mr. Gruber, who has 

 watched carefully during several seasons the trees of these two forms 

 growing near together, is convinced that Cratoegus trahax should be 

 specifically distinguished. A plant in an old hedge on Island Road, 

 West Philadelphia, B. H. Smith (No. 221), June 3, 1903, probably 

 belongs to this species. 



3. Crataegus olivacea n. sp. 



Glabrous with the exception of the hairs on the upper surface of the 

 young leaves. Leaves oblong-obovate, acuminate at the ends or 

 sometimes acute at the apex, and sharply often doubly serrate above 

 the middle, with straight glandular teeth; about half-grown when the 

 flowers open late in May and then thin, dark yellow-green, smooth, 

 lustrous and glabrous above with the exception of occasional hairs 

 on the midribs, and pale and glabrous below, and at maturity thin 

 but firm in texture, dark green and lustrous on the upper surface, 

 light yellow-green on the lower surface, 5.5-7 cm. long and 3-3.5 

 cm. wide, with stout midribs and thin very prominent primary veins; 

 petioles stout, wing-margined often to the middle, glandular, with 

 minute often persistent glands 2-2.2 cm. in length; leaves on vigorous 

 shoots thicker, more coarsely serrate, occasionally slightly lobed 

 toward the apex, 7-10 cm. long and 3.5-4 cm. wide. Flowers on long 

 slender pedicels, in wide, lax, mostly 14-20-flowered, corymbs, with 

 linear glandular bracts and bractlets fading brown and generally 

 deciduous before the flowers open, the elongated lower peduncles from 

 the axils of upper leaves; calyx-tube narrowly obconic, the lobes long, 

 slender, entire, reflexed after anthesis; stamens 10; anthers pale pink; 

 styles 2. Fruit ripening the end of September, on long slender droop- 

 ing red pedicels, in few-fruited clusters, short-oblong, full and rounded 

 at the ends or slightly narrowed at the base, dull red, marked by numerous 

 large dark dots, 1-1.2 cm. long and 8-10 mm. in diameter; calyx little 

 enlarged, with a wide shallow cavity, and small spreading and appressed 

 lobes; flesh thin, green, dry and hard; nutlets 2, broad and rounded 

 at the apex, narrow and rounded at the base, ridged on the back with 

 a high broad grooved ridge 6-7 mm. long and 4-4.5 mm. wide. 



A tree 7-9 m. high, with a tall trunk sometimes 3 dm. in diameter, 

 covered with dark fissured and scaly bark, large wide-spreading 



