526 



ROSACEAE 



Physocarpus 



50 



Map 1086 



Physocarpus opulifolius ILJ Maxim. 



o 53 



Map 1088 



Spiraea alba DuRoi 



1. Physocarpus opulifolius (L.) Maxim. (Opulnster opulifolius (L.) 

 Kuntze of Britton and Brown, Illus. Flora, ed. 2.) Common Ninebark. 

 Map 1086. Generally local to very local in all parts of the state. It gen- 

 erally grows along streams a few feet above the water level, sometimes 

 higher up on the banks, and rarely in crevices at the tops of cliffs. I once 

 found it in a marsh along Pigeon River west of Mongo, in Lagrange 

 County, where it was common. 



Que. to ne. Minn., southw. to Ga. and Ky. 



la. Physocarpus opulifolius var. intermedius (Rydb.) Robinson. 

 (Opulaster intermedius Rydb. of Britton and Brown, Illus. Flora, ed. 2.) 

 Illinois Ninebark. Map 1087. I am not able to separate this variety from 

 the species by any character other than the pubescence. The number of 

 follicles of both species and variety of all except one of my specimens is 3. 

 The pedicels, with one exception, are densely stellate-pubescent. The 

 habitat is similar to that of the species. 



Western N. Y. to S. Dak., southw. to 111., Mo., Ark., and Colo. 



3319. SPIRAEA [Tourn.] L. Spirea 



Leaves glabrous or sparingly pubescent beneath; calyx lobes not reflexed. 

 Inflorescence puberulent. 



Inflorescence elongate, paniculate 1. S. nlha. 



Inflorescence flat-topped, corymbose. (See excluded species no. 297, p. 1057.) 



S. japonica. 



Inflorescence glabrous or glabrate. (See excluded species no. 298, p. 1057.) 



S. lati folia. 



Leaves tomentose beneath; calyx lobes reflexed 2. S. tomentosa. 



1. Spiraea alba DuRoi. (Spiraea salici folia L. in part, of Gray, Man., 

 ed. 7.) Meadow Spirea. Map 1088. This species is infrequent to frequent 

 in the lake area and southward to the center of the state in moist, black 

 soil about lakes, in marshes, and in roadside ditches. South of this area 



