138 FLOWERS OF FIELD, HILL, AND SWAMP 



Sepals, 5. Petals, 5, small, inconspicuous, not longer than 

 the sepals. The hollow, thick stem contains an acrid juice 

 which blisters tlie mouth. About i foot high. 



3. Bristly Crowfoot 



R. Pennsylvdnicus. — Color, yellow. Lemies, divided into 

 threes, the divisions stalked, and irregularly cut or toothed. 

 Ti7)ie, summer. 



Sepals, 5, turned back. Petals, 5, small. Head of achenes, 

 long. Stout and erect, with stems leafy to the top, and beset 

 with bristly hairs. Flowers, inconspicuous, i to 2 feet high. 



4. Northern Crowfoot 



A low but prettv crowfoot is one with large yellow petals, 

 P. septentrionalis, an early flower, coming into blossom in May 

 and continuing till August. Most of the stems ascend; some 

 lie on the ground and send out runners. Leaves irregularly 

 cut, the leaflets stalked or sessile, i to 3 feet high. 



5. Creeping Crowfoot 



R. repcns often has leaves variegated with white spots. It 

 is probably an introduced species. Much like the last, but 

 flowering later. Flowers i inch across. 



6. Early Spring Cress 



Cardam)ne rhomboidea. — Family, Mustard. Color, white. 

 Leaves, uncut, broad, those at the root roundish or heart- 

 shaped; those on the stem growing narrower till they become 

 lance-shaped. All somewhat toothed. Titne, April to June. 



Sepals, 4. Petals, 4, open, spreading. Starnens, 6, 2 shorter 

 than the others. Pod, long, tipped with a slender style and 

 large stigma, 2valved, opening with a sudden movement, and 

 disclosintr a single row of seeds in each cell. 6 to 18 in. high. 



