EOSACEAE (ROSE FAMILY) 461 



N". S. — In this genus, the figures are of the leaves and flowers on a scale of 

 f , the whole fruit, 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 eize. 



Key to Sections, etc. 



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



solitary § 1 



«. Native species b. 

 6. Nutlets with cavities on their ventral faces. 

 Nutlets with shallow cavities. 

 Cavities 1 on each ventral face, often faint or wanting; fruit red . . • • • § 1^ 



Cavities several on each ventral face, shallow ; fruit black ♦1^® 



Nutlets with 1 deep cavity on each ventral face §17 



b. Nutlets without cavities on their ventral faces c. 

 c. Nest of nutlets without sinuses ; fruit small. 



Nutlets 2 ; leaves deeply lobed or cut ...glO 



Nutlets 5 ; leaves slightly lobed or entire § 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. 



e. Calyx-lobes foliaceous, persistent on fruit; flowers l-3(-6) § 7 



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

 /. Corymbs 8-7-flowered, 



Leaves short-obovate to spatulate, very glandular § 6 



Leaves elliptic-ovate, slightly glandular §5 



/. Corymbs many-flowered g. 

 g. Leaves obovate or spatulate. 



Leaves coriaceous, dark green and shining above § 2 



Leaves membranaceous, dull, impressed-veiued 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. 



k. 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. 8 



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 (3-6 cm. wide) ; sinuses between the nutlets shallow ; 



nutlets usually 3-4 § 11 



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

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



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



Leaves broadest toward the base. 

 Mature leaves usually glabrous above ; young foliage bronze-green . § 18 

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



Auxiliary Key (For use in default of mature fruit) ^ 



», Calyx-lobes entire (sometimes glandular-morgiiied). 



Leaves conspicuously deltoid-cordate, glabrous §15 



Leaves not deltoid-cordate. 

 Leaves glabrous beneath, pubescent above ; region of the apper Great Lakes . , § 18 

 Leaves pubescent beneath (at least along tlie veins). 



Leaves deeply lobed ; Introduced ••■§! 



Leaves entire or slightly lobed ; native. 

 Leaves broadest toward the apex. 

 Leaves obovate to oblong. 

 Leaves coriaceous, dark green and shining above . « • ■ • . | 2 

 Leaves membranaceous, dull, impressed-velned above • . • . • I ^ 



Leaves spatulate ...> §9 



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



Leaves broadest toward the base, membranaceous, glabrous § 11 



u. Calyx-lobes serrate b. 



h. Leaves deeply lobed v. •■••••$ ^^ 



h. Leaves entire or slightly lobed c. 

 e. Corymbs few(l-7)-9owered. 



Calyx-lobes foliaceous, lacinlate ...•• •fi? 



Calyx-lobes not foliaceous, glandular-serrate. 



Leaves short-obovate, very glandular ., Sfl 



Leaves elliptical-ovate, slightly glandular % i 



