Class XH. Order V. 



seveft, oblong, serrate, whitish underneath. Flowers dark, dull 

 purple, every part permanent. Calyx ten cleft, every other 

 segment larger. Corolla five small petals. Fruit enclosed in 

 the flower, resembling a strawberry, but spongy and permanent. 

 = Found in Neponset river. June. Perennial. 



154. POTENTILLA. 

 POTENTILLA ANSERiNA. L. Silver weed. Wild tansey. 



Leaves interruptedly pinnate, serrate, silky un- 

 derneath, stem creeping, peduncles one flowered. 

 Sm. 



A handsome plant common on the marshes at South Boston 

 and Cambridge. Stems hairy and reddish, creeping extensive- 

 ly among the grass. Leaves pinnate, the large Icafcts alternat- 

 ing with small ones, green above and of a fine silvery appear- 

 ance beneath. Flowers yellow, solitary, on long, axillary pe^- 

 duncles. June. Perennial. 



POTENTILLA ARGENTEA. L. Hoary cinquefoil. 



Leaves quinate, wedge form, cut, downy under- 

 ueath, stem nearly erect. 



A small, humble species, frequent on Boston common and 

 elsewhere in dry soils. Stems spreading, half erect, white and 

 downy. Leaves alternate, consisting of five wedge form or 

 spatulate leafets, cut into a few lobes or large teeth at the end, 

 white and downy underneath. Flowers numerous, on the ends 

 of the branches, small, yellow. From June to September-- 

 Perennial. 



POTENTILLA SIMPLEX. Mich. Common Cinquefoil, or Five- 

 finger. 



Erect, simple, hairy ; leaves five- digitate, ob- 

 long, oval ; peduncles lateral, solitary, elongated, 

 one flowered. Mich, 



