1916] Flora of the Boston District,— XXV. 251 



PARNASSIA. 



P. caroliniana Michx. Meadows; Dan vers, Lynnfield, Wake- 

 field, Maiden, Weston, Groton, Framingham ; Georgetown, Topsfield, 

 Hamilton, Marblehead, according to Robinson, Fl. Essex Co. 51, 1880; 

 Reading, Ashland, according to Dame & Collins, Fl. Middlesex Co. 35, 

 1888. 



PHILADELPHUS. 



P. coronarius L. Roadside escape, Blue Hills (W. H. Manning, 

 Sept. 1, 1895). 



P. coronarius L., var. tomentosus (Wall.) Hook. f. & Thorns. 

 A foreign introduction; well established, persistent and forming 

 thickets on rocky knoll near site of old greenhouse, Arlington (C. A. 

 Weatherby, Aug. 4 and 24, 1908). See Rhodora xvii. 122, 1915. 



RIBES. 



R. americanum Mill. (R. floridum L'Her.; see Rhodora xi. 46, 

 1909.) Moist soil from Sherborn and the Blue Hills north, occasional; 

 also at N. Easton (C. Blomberg, May 6, 1902). 



R. Grossularia L. Wilmington {B. L. Robinson, May 4, 1899); 

 roadside, Arlington, (M. L. Fernald, May 11, 1913); Blue Hills (W. H. 

 Manning, Aug. 21, 1894); in woods, dry rocky hillside, Cohasset 

 (J. A. Cushman, May 29, 1907). 



R. hirtellum Michx. (R. oxyacanthoides of authors, not L.; see 

 Fernald, Rhodora xiii. 73-76, 1911.) In wet and dry soil, frequent 

 throughout. 



R. nigrum L. Occasional garden escape; " Ipswich River," 

 Lowell, Milton, Medway. 



R. ODORATUM Wendland. (R. aureum of authors, not Pursh.; see 

 Rhodora xi. 47, 1909.) Persistent and escaping from old gardens; 

 Georgetown, Andover, Salem, Sherborn. 



R. vulgare Lam. Spontaneous, persistent, frequent tliroughout. 



SAXIFRAGA. 



S. pennsylvanica L. Swamps and meadows, common throughout. 

 S. virginiensis Michx. Dry banks and ledges, very common 

 throughout. 



