162 FLORA OF PHILADELPHIA. 



iSoiem—Penn Grove (0.). Mercer— Trenton, Princeton (C). Huntett- 

 don — Rosemont (C). 

 New Castle— Cherry, Island. Frequent. ( 



5. Eoripa Nasturtium (L.) Busby. Water Cress. , M. -p. 453,, Brooks 



and ditches. Summer. 



6. Eoripa Armoracea (L.) A. S. Hitchcock. Hiorse-radish. M. p. 453. 



Escaped, from cultivation into moist ground. Summer. 



7. Eoripa Americana (A. Gray) Britton. M. p. 453. Slow streams. 



Summer. 

 Philadelphia— (P.) . 



13. CAED AMINE L. Bitter Cress. 



Leaves pinnately divided, or some of them of but a single terminal segment. 

 Flowers' 1 : 2 cm. broad, white or purplish. 1. C. pratense. 



Flowers 2-8 mm. broad, white. , , 



Mature pods erect, 0.5-1 mm. wide. 



Flowers 4-5 mm. wide; plants of swamps, streams, or wet 



grounds. 



Segments of basal leaves 4-25 mm. wide; plant 2-9 dm. 



tall. 2. C. Pennsylvanica. 



Segments of basal leaves 1-3 mm. wide ; plant 1-3 dm. tall. 



3. C. arenicola. 

 Flowers 2-3 mm. wide; plant of dry, rocky situations. 



4. C. parviflota. 

 Mature pods, dwergent or ascending, more than 1 mm. wide, 



5. C. flexuosa. 

 Leaves entire, toothed, or rarely with 1 or 2 lateral segments. 



Stem erect from a tuberous base. 6. C. bulbosa. 



Stem decumbent, stoloniferous; roots fibrous. 7. C. rotundifolia. 



1. Gabdawine pratensis L. Cuckoo-flower. M. p. 454. Wet places. 



Spring. 

 Philadelphia— Vfiasab.idk.on (Ja,), Germantown (Me.). 



2. Cardamine Pennsylvanica Muhl. M. p. 454. Wet places. Spring. 



3. Cardamine arenicola Britton. M. p. 454. Moist or wet sandy soil. 



Spring. 

 Lancaster— Safe Harbor (P.).* 



4. Cardamine parviflora L. M. p. 454. Rocks. Spring. 



5. Cardamine flexuosa With. M. p. 454. In wet woods and swamps. 



Spring. 

 Bucks— Three-Mile Eun, Tullytown (Fr.). Northampton— (P.). 



6. Cardamine bulbosa (Schreb.) B. S. P. Spring Cress. M. p. 455. Wet 



meadows and springs. -Spring. 



7. Cardamine rotundifolia Michx. M. p. 455. Cool, shaded springs. 



Spring. , ' ..;,.. ,. 



Bucks— Quakertown (Cr.), Springfield, rare (Fr.). Delaware— Valley 

 of Darfcy Creek (B. Sm.). Chester— Coatesyjlle, H. M. Stone (B. C), 

 Upland, London Grove (Le.). Lancaster — York Furnace (Cr.) (Ja.) 

 (Li.). Dauphin— Rockville (Wn.). 



New Castle— -N. Park, N. Long Race, Tatmll; Mount Cuba, Commons. 

 Bare. 



