ROSACEAE , 165 



2. SPIRAEA L. 



Inflorescence pyramidal. 



Plant pubescent : follicles tomentose. i. 5". lomentosa. 



Plant glabrous : follicles glabrous. 2. 5*. salicifolia. 



Inflorescence corymbose. 



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



3. S. corymbosa. 



Stem, leaves and inflorescence pubescent. 4. 5". Japonica. 



1. Spiraea tomentosa L. H.a.rdhack. Steeple-bush. (Man. p. 

 492 ; I. F. f. 1SS4. ) la swamps and low grounds, N. S. to Man., Ga. and 

 Kans. — Pennsylvania : Monroe ; Northampton ; Bucks ; Delaware ; 

 Lancaster ; Luzerne ; Allegheny. 



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

 sweet. (Man. p. 492; I. F. /. ^8Sj.) 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. Corvmbed Spiraea. (Man. p. 492 ; I.* 

 F.y. /S8j.) 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. _/. iSS'/.) In rich woods, Pa. to Iowa, Ga. and Mo. Also from Ore. 

 to Klaska.— Pennsylvania : Huntingdon ; Somerset; Fayette ; Alle- 

 gheny ; Armstrong. 



4. SORBARIA A. Br. 



1. Sorbaria 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. 



1. P. slipulatus. 



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

 man's-rooT. (Man. p. 493 ; I. F. _/ 18SS.) 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. f. iSSg.) In woods, N. Y. to Kans., Ala., La. and 

 the I. Terr.— Pennsylvania : Allegheny. 



