Class XII. Order V. 205 



during the summer. Leaves quinate with hairy petioles. Leaf- 

 ets obovate, obtuse, their upper half deeply serrated, glabrous 

 above, paler >and hairy underneath. -Stipules hairy, acute, those 

 of the stem about six cleft. Peduncles solitary, slender, hairy, 

 longer than the petiole which springs from the same joint. 

 Calyx segments hairy, acute, some of them furnished with a 

 small tooth or two. Petals roundish, retuse, a little longer than 

 the calyx. Anthers sagittate. 



During the summer a fleshy thickening often takes place in 

 various parts of the stem, apparently caused by insects. The 

 flowers reappear in October. 



Very distinct from P. simplex, though quoted by Pursh as 

 synonymous. 



POTENTILLA NoRVEGicA. L. Norway Cinquefoil. 



Leaves ternate ; stem dichotomous ; peduncles axil- 

 lary. L. 



An erect, hairy plant. Stem round, straight, forked at top. 

 Leaves in threes, oval, cut-serrate, their petioles and veins cov- 

 ered with long hairs. Stipules ovate, acute, somewhat toothed. 

 Flowers numerous, axillary, and terminal, somewhat crowded. 

 Petals yellow, shorter than the calyx. By road sides and thick- 

 ets. July Perennial. 



POTENTILLA TRIDENTATA. L. Mountain Pofentilla. 



Leaves ternate, evergreen ; leafets wedge shaped, 

 three toothed at the end ; peduncles few flowered. 



A suffruticose alpine plant of all our northern mountains. The 

 lower pare of the stem is woody, prostrate, rooting, with subu- 

 late stipules at top, below the leaves. Petioles short, slightly 

 hairy. Leafets three, sessile, smooth, coriaceous, oblong-wedge 

 shaped, uniformly ending in three nearly equal teeth. Flowering 

 stalk hairy, with several small, ternale, lanceolate leafets. 

 Flowers few, in a sort of irregular corymb. Calyx acute, the 

 narrow segments more obtuse. Petals oblong, white, longer 

 than the calyx. Abundant on the summit of VVachusett. On the 

 White mountains, Moosehillock, &c. In the college yard at 

 Brunswick. June. 



