CRATAEGUS IN ROCHESTER, NEW YORK. 1 27 



their first season, becoming bright red-brown and lustrous the follow- 

 ing year and ultimately dull gray, and armed with stout curved light 

 red-brown shining spines 3-5 cm. long, usually pointed downward 

 toward the base of the branch, and often long-persistent on the old 

 stems. 



Rochester; blufTs of the gorge of the Genesee River north of the 

 city, C .5". Sarge?it, September 19, 1900, September, 1902, Jo/in 

 Dunbar, October 10, 1900, John Dunbar, May and October, 1901, 

 October, 1902 ; Adams Basin, M. S. Baxter, October, 1902 ; Delaware 

 Park, Buffalo, Jo/in Dunbar, October 6, 1902. 



This species, which is easily recognized by the olive-green color 

 of the branches in their first year, is placed temporarily with the 

 Tenuifoliae. The leaves, however, become much thicker late in the 

 season than the leaves of the other species of this group, and in their 

 form approach those of Crataegus Durobrivensis, Sargent, and it may 

 be desirable to consider Crataegus Dunbari, a type of a new section of 

 the genus, characterized by flowers with 10 stamens and rose-colored 

 anthers, subglobose fruit with a small fruiting calyx, and by thick 

 o\ate or semiorbicular leaves. This handsome plant is named for Mr. 

 John Dunbar, the assistant superintendent of the parks of Rochester, 

 untiring in labor in making known the remarkable group of Crataegus 

 found in the valley of the Genesee River, who first pointed it out to 

 me. 



Crataegus benigna, n. sp. 



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

 the young leaves and their petioles. Leaves oblong-ovate, acuminate, 

 abruptly concave-cuneate or rounded at the wide crenate or entire 

 base, sharply doubly serrate above, with straight gland-tipped teeth, 

 and slightly divided into 4 or 5 pairs of short broad acute or acuminate 

 lobes ; when they unfold covered on the upper surface vvitii short 

 rigid pale hairs and more than half grown when the flowers open and 

 then very thin, light yellow-green and still slightly hairy or scabrate 

 above ; at maturity thin but firm in texture, dull dark bluish green 

 and still slightly roughened on the upper surface, pale bluish green 

 below, 5-6 cm. long, 4.5 cm. wide, with stout orange colored midribs 

 and 4 or 5 pairs of thin primary veins extending obliquely to the points 

 of the lobes ; petioles slender, slightly wing-margined at the apex, 

 grooved, sparingly glandular, villose along the upper side early in the 

 season, soon glabrous, 2-3 cm. in length ; on vigorous leading shoots 



