1922) SARGENT, NOTES ON NORTH AMERICAN TREES, X. 201 



or rounded teeth; nearly half grown when the flowers open and then rough- 

 ened above by short white hairs and slightly villose below along the mid- 



green 



3-4 



and 2-2.5 cm. wide; petioles slender, slightly winged at the apex by the 

 decurrent base of the blade, 8-10 mm. in length. Flowers opening the 

 middle of May, 1.5-1.8 cm. in diameter, on slender slightly villose pedicels 

 in small usually 3- or 2- or 1 -flowered corymbs, the pedicel of the central 

 flower of the 3-flowered corymb not more than one quarter the length of 

 the others; calyx-tube narrow-obconic, villose, the lobes foliaceous, gradu- 

 ally narrowed from the base, acuminate, laciniately glandular-serrate 

 above the middle, slightly villose; stamens 20; anthers white; styles 3-5. 

 Fruit ripening the end of October, subglobose, orange-red, 1 cm. in diam- 

 eter, the calyx only slightly enlarged with a short tube, a narrow deep 

 cavity pointed in the bottom and spreading and reflexed lobes; flesh thin 

 and dry; nutlets usually 3, rounded at the ends, broader at the apex than at 

 the gradually narrowed base, rounded and only slightly grooved or rarely 

 obscurely ridged on the back, 6-7 mm. long and 4-5 mm. wide. 



A small shrub with slender branchlets yellow-brown and covered with 

 white matted hairs during their first season and dark gray the following 

 year, and armed with slender straight gray spines 1.5-3 cm. in length. 



Virginia. Alleghany County, gravelly hill-slopes along the James River, 

 Clifton Forge, T. G. Harbison, Nos. 9 (type) and 16, May 23 and October 25, 1919. 



A specimen with young fruit collected by John K. Small on Walker 

 Mountain, at Shannon Gap, Smythe County, Virginia, June 20, 1892, should 

 perhaps be referred to this species. By the shape and size of its leaves, 

 small flowers and fruit and by its general aspect this species might be con- 

 sidered one of the Uniflorae to which plants with 3- or 4-flowered corymbs 

 have been referred. The normally 3-flowered inflorescence, however, with 

 two long and one short central pedicel, the character on which the Triflorae 

 Group is based, is such an important one that I am inclined to refer it to 

 that Group, considering it an intermediate and connecting link between 

 the Uniflorae and Triflorae. 



Crataegus choriophylla (§ Uniflorae), n. sp. 



Leaves obovate to elliptic, acute or acuminate at apex, gradually 

 narrowed and cuneate at the glandular base, divided above the middle 

 into short acute lobes, and coarsely often doubly serrate with wide blunt or 

 acute teeth ; when they unfold tinged with red and covered above and on 

 the midrib and primary veins below with short white hairs, and at maturity 

 thick dark yellow-green, smooth and lustrous on the upper surface, paler 

 and nearly glabrous on the lower surface, 3-4 cm. long and 2.5-3 cm. 

 wide, with a slender midrib slightly villose toward the base of the leaf and 

 with thin primary veins impressed on its upper surface; petioles stout, 

 narrowly wing-margined at apex, villose early in the season, becoming 



