ELISHA MITCHELL SCIENTIFIC JOURNAL 49 



cm long-. Flowers, appearing- the last of May in large loose 

 compound many-flowered glabrous clusters, are about 16 mm 

 wide, stamens 5-8. Fruit, borne in loose compound many- 

 fruited pendent clusters, ripening- from the first to the middle 

 of October, is oblong-, 11-13 mm long, 8-10 mm thick, russet 

 or at length scarlet, the flesh firm, white and juicy; lobes 

 narrow, entire, reflexed or deciduous, seed 3 or 4, small. 



Summerville, St. Clair County, Michig-an; W. W. Ashe 

 and C. K. Dodge, September, 1902, and October, 1903; C. K. 

 Dodge, May and September, 1903. 



Crataegus retrusa. A shrubby tree seldom more than 

 4 m in height with slender chestnut twigs and stout 2-4 cm- 

 long slender ascending thorns. Leaves thin, glabrous, ovate 

 or broadly ovate, 4-6 cm long, 3.5-4.5 cm wide, rounded or 

 broadly cuneate at base, with several pairs of short broad notch- 

 es, finely doubly serrate. The flowers, appearing about the 

 20th of May in loose glabrous compound many-flowered clusters, 

 are about 22 mm wide; stamens 5-7, anthers pale purple. 

 Fruit, borne in loose few-fruited slightly compound long-ped- 

 iceled clusters and ripening late in September, is oblong- or 

 usually obovate, full and rounded at the ends, 13-15 mm long, 

 12-14 mm thick, orange-scarlet, often mottled with orange at 

 apex, capped by the erect fleshy bases of the lobes; flesh thick, 

 sweet, orange; seed 3-4, thick and coarse, grooved on back, 

 about 7 mm long. 



Summerville, St. Clair County, Michigan, where very com- 

 mon. C. K. Dodge and W. W. Ashe, Sept., 1902; Oct., 1903; 

 C. K. Dodge, May, 1903, Sept., 1903. 



Crataegus gravis. A tree 6-7 m high with thorny scaly 

 bark on the trunk, ascending fluted gray branches, and*stout 

 dull chestnut glabrous twigs, freely armed with stout 3-4 cm- 

 long slightly recurved thorns. Leaves thick, firm, bright 

 green, pubescent above when young, otherwise glabrous, 

 ovate to nearly orbicular, 3-5 cm long, 2.5-5 cm wide, rounded 

 or obtuse at base, finely and obtusely doubly serrate, several 

 pairs of very shallow notches, turning dull yellow or brown 



