3^2 ROSACEAE 



Pa. Northampton, Lehigh, Bucks, Chester and Delaware counties. 

 Tertiary, o: Cretaceous, scattering: Older Formations, not 

 common. 138-220 days. Sea level-1,000 ft. 



2. Spiraea [Tourn.] L. 



Inflorescence simple. 1. 5. ulmifolia. 



Inflorescence compound, flowers paniculate. 



Sepals merely spreading; disk obsolete; leaves not tomentose 

 beneath. 

 Inflorescence glabrous; leaf-blades broadly oblanceolate to 



obovate. 2. 5. latifolia. 



Inflorescence pubescent. 



Leaves elliptic-lanceolate. 3. 5. salicifolia. 



Leaves narrowly oblanceolate. 4. 5. alba. 



Sepals soon reflexed; leaves tomentose beneath. 5. 5. lomenlosa. 



i . S. ulmifolia Scop. Cultivated and sometimes escaping in the 

 eastern states. Native of southern Europe. 



Not uncommon as an escape, especially in Conn. Rare in N. Y. 



2. S. latifolia (Ait.) Borkh. In meadows: Newf. to N. Car., W. 



Pa. and Sask. 



Throughout the range except the region east and south of the 

 pine-barrens in N. J. 



3. S. salicifolia L. Sometimes escaping from cultivation: Eas- 



tern and Middle States. Native of Siberia. 

 Occasional as an escape in most parts of our range. 



4. S. alba Du Roi. Wet soil: Ont. to N. Y., N. C, Sask. and 



Mo. 



Known, in our area, only from the Fishkill Mts., N. Y. 



5. S. tomentosa L. In swampy and wet places, sometimes in 



fields: N. S. to Ga., Ark., Kan. and Man. 

 Throughout the range in favorable localities, usually very common. 



Among the Japanese garden forms commonly cultivated, but rarely escaping are 

 S. chamaedrifolia L., 5. japonica L. f. and S. prunifolia Sieb. & Zucc. None are to be 

 considered as part of our wild flora. 



S. corymbosa Raf. recorded from Morris Co., N. J., has not been subsequently col- 

 lected within the range. 



3. Aruncus [L.] Adans. 

 1. A. Aruncus (L.) Karst. Commonly cultivated but not escap- 

 ing very freely in the Eastern United States. Native of 

 Europe. 

 A rare escape, perhaps nowhere established within our area. 



