I&2 FLORA OF PHILADELFHIA. 



■ iSaiem—Penn Grove (C). Mercer— Trenton, Princeton (C). Hunter- 

 don — Eosemont (C.)- 



New Castle— Cherry Island. Frequent, 



5. EORIPA Nasturtium (L.) Rusby. Water Cress. M. p. 453. Brooks 



and ditches. Summer. 



6. RORIPA Armoracea (L.) a. S. Hitchcock. Horse-radish. M. p. 453. 



Escaped from cultivation into moist ground. Summer. 



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



Summer. 

 Philadelphia — (P.) . 



13. CARDAMINE L. Bitter Cress. 



liCaves 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. 



taU. 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. parvifiora. 

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



5. C. fiexuosa. 

 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. Cardamine pratensis L. Cuckoo-flower, M. p. 454. Wet places. 



Spring. 

 Philadelphia— 'Wissahiekon (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. 

 Loncoster— 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. 

 Bmc^s— Three-Mile Run, Tullytowu (Fr.). Northampton— {P.). 



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



meadows aad springs. Spring. 



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



Spring. 



J?«c/:s— Quakertown (Cr.), Springfield, rare (Fr.). Delaivare—Yallej 

 of Darby Creek (B. Sm.). Cftesfer— Coatesville, H. E. Stone (B. C), 

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

 (Li.). Dauphin— Uockville (Wn.). 



New Castle— N. Park, N. Long Race, Tatnall; Mount CHiba, Commo7is, 

 Bare. 



