356 ITEACEAE 



2. M. virginiensis (Michx.) Small (Saxifraga virginiensis Michx.) 



In dry or rocky woodlands: N. B. to Minn., Ga. and Tenn. 

 Throughout the range, except in the pine-barrens of L. I. and 

 N. J., there rare or wanting. 



3. M. micranthidifolia (Haw.) Small (Saxifraga erosa Pursh, 6 1 . 



micranthldifolia (Haw.) Small). In cold brooks: Pa. to N. 



C. and Tenn. 



Pa. Northampton and Lehigh Co. 



A rare and local plant in our range, most common on limestone. 



HYDRANGEACEAE 



Stamens 8-10, corolla relatively small. I. Hydrangea. 



Stamens 12-20, corolla relatively large. 2. Philadelphus. 



i. Hydrangea [Gron.] L. 

 1. H. arborescens L. On rocky stream or river banks: N. Y. 

 to Iowa, Fla. and La. 

 N. Y. The Highlands of the Hudson. 

 N. J. From Kinkora, Burlington Co., northward in the counties 



bordering the Delaware; otherwise unknown. 

 Pa. Pike, Luzerne, Northampton, Bucks, Philadelphia, Delaware 

 and Chester counties, more common along the Delaware than 

 elsewhere. 



Tertiary, o: Cretaceous, scattered in Burlington Co., N. J. and 

 Bucks Co., Pa.: Older Formations, apparently more common on the 

 Piedmont Plateau than elsewhere. 138-220 days. Sea level- 

 1,000 ft. 



2. Philadelphus L. 



1. P. coronarius L. Escaped from gardens: middle and eastern 



states. Native of Europe. 



Rather a rare escape in most parts of our range. 



Other cultivated shrubs sometimes recorded as being escapes are Philadelphus 

 inodorus L., P. pubescens Koch, and Deulzia scabra Sieb. & Zucc. None are to be 

 considered as part of our flora. 



ITEACEAE 

 1. Itea L. 

 1. I. virginica L. In wet places or pine-barren swamps: N. J. 

 and E. Pa. to Fla. and La. 



