ROSACEAE (ROSE FAMILY) 461 



JV. B. In this genus, the figures are of the leaves and flowers on a scale of 

 $, the whole fniit, lateral and terminal views of the fruit with the upper part of 

 the flesh removed, and in some cases ventral views of nutlets, all natural size. 



KEY TO SECTIONS, ETC. 



a. Introduced species ; leaves deeply 3-5-lobed ; fruit red ; calyx-lobes entire, short ; nutlet 



solitary {1 



. Native species b. 



b. Nutlets with cavities on their ventral faces. 

 Nutli'ts with shallow cavities, 

 ('.ivilii's 1 on each ventral face, often faint or wanting; fruit red . . . . .Sift 



Cavities several on each ventral face, shallow ; fruit black $18 



Nutlets with 1 deep cavity on each ventral face . . . . . . 17 

 6. Nutlets without cavities on their ventral faces c. 

 c. Nest of nutlets without sinuses ; fruit small. 



Nutlets 2 ; leaves deeply lobed or cut . . 10 



Nutlets 5 ; leaves slightly lobed or entire S 9 



c. Nest of nutlets with sinuses ; fruit large or small d. 



d. Leaves conspicuously deltoid-cordate, glabrous .15 



d. Leaves not deltoid-cordate e. 



t. Calyx-lobes foliaceous, persistent on fruit; flowers l-8( 6) j 7 



t. Calyx-lobes not foliaceous, often deciduous /. 

 f. Corymbs 3-7-flowered. 



Leaves short-obovate to spatulate, very glandular 66 



Leaves elliptic-ovate, slightly glandular 5 



f. Corymbs many-flowered g. 

 g. Leaves obovate or spatulate. 



Leaves coriaceous, dark green and shining abov* 2 



Leaves membranaceous, dull, impressed-veined above. 



Fruit glabrous ; nutlets acute at both ends ; calyx-lobes entire . . . 8 

 Fruit slightly tomentose ; nutlets obtuse at the apex ; calyx-lobes serrate no. 49 

 g. Leaves not obovate or spatulate h. 

 A. Leaves 3-lobed toward the apex ........ .$4 



A. Leaves not 3-lobed i. 



i. Leaves glabrous (when mature) j. 



j. Leaves broadest at the middle. 



Fruit firm when ripe. 



Nutlets 2-3 no. 3 



Nutlets 4-5 no. 9 



Fruit soft when ripe nos. 24, 25, 26, 28 



J. Leaves broadest toward the base. 



Fruit firm when ripe 12 



Fruit soft. 

 Leaves small (3-fi cm. wide) ; sinuses between the nutlets shallow ; 



nutlets usually 8-4 811 



Leaves larpe (4-10 cm. wide) ; nutlets 3-5 .... nos. 50, 52, 53 

 4. Leaves pubescent (at least along the veins below). 



Leaves broadest at the middle nos. 23, 27, 28, 29, 8 



Leaves broadest toward .the base. 



Mature leaves usually glabrous above ; young foliage bronze-green . 13 

 Mature leaves tomentose above ; young foliage yellow-green . . 14 



AUXILIARY KEY (For use in default of mature fruit) 



n. Calyx-lobes entire (sometimes glandular-margined). 



Leaves conspicuously deltoid-cordate, glabrous $15 



Leaves not deltoid-cordate. 



Leaves glabrous beneath, pubescent above ; region of the upper Great Lakes . . $ 18 

 Leaves pubescent beneath (at least along the veins). 



Leaves deeply lobed ; introduced $1 



Leaves entire or slightly lobed ; native. 

 Leaves broadest toward the apex. 

 Leaves obovate to oblong. 

 Leaves coriaceous, dark green and shining above . . . . . .82 



Leaves membranaceous, dull, impressed-veined above | 



Leaves spatulate $9 



Leaves broadest at the middle ; apex often 3-lobed $ 4 



Leaves broadest toward the base, membranaceous, glabrous . . . . . 11 

 a. Calyx-lobes serrate b. 



b. Leaves deeply lobed ,.....$10 



b. Leaves entire or slightly lobed c. 

 C. Corymbs few(l-7)-flowered. 



Calyx-lobes folinceous, laciniate J7 



Calyx-lobes not foliaceous, glandular-serrate. 



Leaves short-obovate, very glandular , . . $ 



Leaves elliptical-ovate, slightly glandular ........ .$6 



