216 CLASS XII. ORDER V. 



224. COMARUM. 

 CoMARUM PALUSTRE. L. MavsTi CinquefoU. 



A genus nearly related to the last, with only one species. 

 Stem round, rising from one to two feet. Leafets three, five or 

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

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

 ment larger. Corolla of five small petals. Fruit enclosed in the 

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

 Found in Neponset river and in Brighton. — June. — Perennial. 



225. POTENTILLA. 



POTENTILLA FLORIBUNDA. PursJl. JBusTiy PotcntUla. 



Shrubby, erect, branching, hairy ; stipules ovate, 

 entire ; leaves five-pinnate, leafets Hnear-oblong, revo- 

 lute; corymbs terminal, dichotomons, dense-flowered, 

 cal^rx-segments snbequal, as long as the petals. 



Syn. POTENTILLA FRUTICOSA. Auct. 



Stems erect or ascending, shrubby, a foot high, covered with 

 a deciduous, reddish bark, and with long fine hairs. Stipules at 

 the base of the leaves and branches ovate, nerved, scarious, 

 clasping, some bifid. Leaves pinnate, with slender, hairy peti- 

 oles ; leafets five, in a sort of tuft, sessile, lanceolate, revolute at 

 the edges, hairy, paler underneath. Flowers in close, compound 

 corymbs on the ends of the branches. Calyx hairy, its segments 

 subequal. Petals obovate, as long as the calyx. — In low grounds, 

 Danvers; sent by Dr. Nichols. 



On comparison with specimens of P. fruticosa, it has smaller 

 and more numerous flowers. Drs. Hooker and Torrey consider 

 the two as indentical. 



PoTENTiLLA ANSERiNA. L. Silvcr Wct'cl. Wild Tmispy. 

 Leaves interruptedljr pinnate, serrate, silky under- 

 neath, stem creeping, peduncles one flowered. Sin. 



A handsome plant, common on the marshes at South Boston 

 and Cambridge. Stems hairy and reddish, creeping extensively 

 among the grass. Leaves pinnate, the large leafets alternating 

 with small ones, green above and of a fine silvery appearance 



