1.910.] NATURAL SCIENCES OF PHILADELPHIA. 219 



3-5. Fruit ripening late in September, on slender drooping slightly 

 hairy pedicels, in wide clusters, subglobose to short-oblong or slightly 

 obovate, rounded at the ends, crimson, lustrous, marked by small 

 pale dots, 1-1.2 cm. in diameter; calyx prominent, with a wide shallow 

 •cavity, and spreading lobes, dark red on the upper side below the 

 middle; flesh thick, light orange-yellow, juicy, acidulous; nutlets 

 3-5 acute at the apex, narrowed and rounded at the base, rounded 

 and sometimes slightly grooved on the back, about 5 mm. long and 

 3 mm. wide. 



A tree 5 or 6 m. high, with a trunk 2 dm. in diameter, covered 

 with dark gray flaky bark, large spreading branches forming a round- 

 topped head, and slender only slightly zigzag glabrous branchlets 

 dark orange-green when they first appear, becoming light chestnut 

 brown, lustrous and marked by dark lenticels in their first season 

 and dark red-brown the following year, and armed with slender straight 

 •chestnut brown shining spines 2-2.5 cm. long. 



Schenly Park, Pittsburg, Allegheny County, 0. E. Jennings, B. H. 

 Smith and C. S. Sargent, (No. 21 type) September 28, 1905, 0. E. 

 Jennings and Grace E. Kinzer, May 24, 1906, May 17, 1907, 0. E. 

 Jennings, September 27, 1907. 



This species is named for Mr. George William Burke, Superintendent 

 of the Parks of Pittsburg, who has aided materially Dr. Jennings 

 in his investigations of Crataegus in that city. 



2. Crataegus sejuncta Sargent. 



Bull. N. Y. State Mus., CV, 65 (1906), CXXII, 71; No. 4, Ontario Nat. 

 Sci. Bull., 48. 



Roadside near Robesonia, Berks County, C. L. Gruber, (No. 226) 

 August 2 and September 2, 1905, May 12, 1906; also western New 

 England, and through New York to southern Ontario. 



From the type at West Albany, New York, of this widely distributed 

 and rather variable species the Robesonia plant differs in its somewhat 

 larger flowers (1.5-2 cm. in diameter), in its 15-20-flowered (not 

 8-10-flowered) corymbs, in the presence of a few hairs on the calyx- 

 tube, and in its rather larger fruits. 



3. Crataegus pedioellata Sargent. 



Bot. Gazette, XXXI, 226 (1901); Silva N. Am., XIII, 101, t. 677; Proc 

 Rochester Acad. Sci., IV, 116; Man., 44S, f. 365; No. 4 Ontario Nat. Sci 

 Bull., 46; Bull. N. Y. State Mus., CXXII, 69; Eggleston, Gray's Man., 

 ed. 7, 475 (in part). 



Between Stoopes Ferry and Carnot, Allegheny County, O. E. Jen- 

 nings and Grace E. Kinzer, (No. 31) October 4 and 6, 1905, O. E. 



