ROSACEAE 166 



2. SPIRAEA I,. 



Inflorescence pyramidal. 



Plant pubescent : follicles tomentose. i. S. tomentosa. 



Plant g-labrous : follicles glabrous. 2. 5. salicifolia. 



Inflorescence corymbose. 

 Stem, leaves and inflorescence glabrous, or the latter with a few hairs. 



3. 5. corymbosa. 

 Stem, leaves and inflorescence pubescent. 4. S. Japonica. 



1. Spiraea tomentosa L. Hardhack. Stbeple-bdsh. (Man. p. 

 492 ;I. F. / 1884.) In swamps and low grounds, N. S. to Man., Ga. and 

 Kans. — Pennsylvania : Monroe ; Northampton ; Bucks ; Dei,awarb ; 

 Lancaster ; Luzerne ; Allegheny. 



2. Spiraea salicifolia L. Willow-lEaved or American Meadow- 

 sweet. (Man. p. 492; I. F. / 18S3.) In swamps or moist grounds, 

 Newf. to the Rocky Mts., Ga. and Mo. — Pennsylvania : Lackawanna ; 

 Monroe ; Northampton ; Bucks; Delaware ; Chester ; Lancas- 

 ter ; Franklin ; Luzerne.; Blair ; Allegheny. 



2a. S. salicifolia latifolia (Ait.) Wiegand. Bucks. 



3. Spiraea corymbosa Raf. Cor ymbed Spiraea. (Man. p. 492; I. 

 F.y^ 188^.] On banks or in rocky places, mountains of Pa. and N. J. to 

 Ga. — Pennsylvania : Fulton, Buck's Valley. 



4. Spiraea Japonica L. f. Japanese Spiraea. (Man. p. 492.) 

 Native of Japan. Adv. or nat. — Pennsylvania : Carbon ; Bucks. ■ 



3. ARUNCUS Adans. 



1. Aruncus Aruncus (L.) Karst. GoaT's-beard. (Man. p. 493 ; I. 

 F. f. 188^.) In rich woods, Pa. to Iowa, Ga. and Mo. Also from Ore. 

 to Alaska. — Pennsylvania: Huntingdon ; SOMERSET ; Fayette ; Alle- 

 gheny ; Armstrong. 



4. SORBARIA A. Br. 



1. Sorbaiia sorbifolia (L.) A. Br. Mountain Ash Spiraea. (Man. 

 p. 493.] Native of Siberia. Adv. or nat. in the U. S. — Pennsylvania: 

 Allegheny. 



5. PORTERANTHUS Britton. 



Lower leaflets serrate : stipules subulate or linear-lanceolate, entire or nearly 

 so. I. P. trifoliatus. 



Lower leaflets incised-pinnatifid ; stipules leaf-like, incised or serrate. 



2. P. slipulatus. 



1. Porteranthus trifoliatus (L.) Britton. Indian Physic. Eow- 

 MAN's-ROOT. (Man. p. 493 ; I. F. 7^ 1888.) In woodlands, N. Y. to 

 Mich., Ga. and Mo. — Pennsylvania : Monroe ; Northampton ; Bucks ; 

 Montgomery ; Chester ; Franklin ; Union ; Centre ; Somerset ; 

 Delaware ; Allegheny. 



2. Porteranthus stipulatus (Muhl.) Britton. American Ipecac. 

 (Man. p. 493 ; I. F. /. i88g.) In woods, N. Y. to Kans., Ala., La. and 

 the I. Terr. — Pennsylvania : Allegheny. 



