38 LEAFLETS. 



nodes about 2 inches long ; leaves 5 to 8 inches long including 

 the f-inch petiole, the blades exactly elliptical as to general 

 outline, but the narrow base subcordate, the apex acuminate, 

 vivid though deep green above, and glabrous except a single 

 series of minute hair-points along midvein and veinlets, beneath 

 sparsely short-hairy everywhere, but the hairs of the midvein 

 stouter and closely appressed, those of the veinlets more spread- 

 ing, the margin also beset with longer stiffer but closely ap- 

 pressed hairs. 



Aquatic state. Internodes longer and stem stouter, rooting 

 at the nodes though floating : leaves cordate-oblong, 4 to 6 

 inches long, the largest 3 inches broad, all acute, but with broad 

 cordate base and on stout petioles of 3 or 4 inches, in every part 

 glabrous. 



This plant is doubtless common on moist or wet wooded bot- 

 toms and shady banks of the upper Mississippi between Iowa 

 and Minnesota and Wisconsin, where at various places I have 

 seen it, though never in flower. My type specimens were taken 

 near LaCrosse, 9 July, 1898, from a colony of plants growing 

 on a stone embankment, and near the water's edge. The 

 sheets before me are three, one showing the terrestrial state, 

 and two the floating- aquatic condition. The three specimens 

 are from one and the same main stem ; parts of one plant ! 



P. VESTiTA. Stoutish, ascending, 2 feet high : leaves ovate- 

 lanceolate and lanceolate, acute or acuminate, subcordate at base, 

 4 to 6 inches long on stout suberect petioles of about 2 inches, 

 both faces canescent with a dense short strigose pubescence, 

 that of the midvein beneath longer than that of the surface 

 but equally slender and closely appressed ; ocreee more canescent 

 than the leaves and with a similar hairiness ; internodes sparsely 

 strigose: flowers rather small, in spikes IJ to 3 inches long 

 borne scarcely above the leaves on somewhat shorter stout glan- 

 dular-hispid peduncles; bracts with back and margin loosely 

 long-hairy. 



Next of kin to P. pratincola, but of more westerly range, and 

 easily distinguished by its smaller stature and dense almost sil- 

 very indument. The best specimen seen is one made by my- 



