448 BICKNELL: FERNS AND FLOWERING PLANTS OF NANTUCKET 
in color more of a lemon yellow, the petals not emarginate; larger 
leaves 2.5 dm. long with leaflets over 5 cm.; young leaves silvery 
sericeous on the upper surface, becoming bright light green and 
glabrate; roots simpler, stouter, and more woody than in A. 
litoralis, often subtuberous thickened. 
*ARGENTINA LITORALIS Rydb. 
Local about the borders of salt marshes along the harbor from 
Quaise to Polpis, also by Sachacha Pond; common ina brackish or 
nearly fresh meadow at Shawkemo; not found on the south shore. 
In full flower June 2, 1909, June 7, 1908, June 20, 1910; some 
plants still in bloom Aug. 5, 1906. Flowers variable in size, the 
largest having a spread of 3~-3.5 cm.; petals deeper yellow than 
those of the preceding species, emarginate; leaves bright green 
and glabrous on the upper surface. Occasionally in moist places 
where the soil has been enriched by deposits of eelgrass, the plant 
takes on an unusually strong growth, the leaves becoming over 
3 dm. long, with leaflets over 5 cm.; in harder or drier soils it is 
often notably reduced in size. 
POTENTILLA ARGENTEA L. 
Common in sandy fields, especially in the town region, but 
extending across the island from Madequet to Quidnet. Just in 
flower May 31, 1909, June 3, 1911, June 15, 1910; late flowers 
at one locality Sept. 19, 1909. 
POTENTILLA MONSPELIENSIS L. 
Not common, but occurring in nearly all quarters of the island, 
usually, however, solitary plants or only a few together. Found 
in waste spots and near cultivated land, as well as in low grounds 
at remoter places, as at Pout Pond, Wigwam Pond, and Pocomo 
Head Pond. Not yet in flower June 7, 1909; freshly in bloom 
June 18, 1909; a single plant bearing flowers Sept. 21, 1907. 
POTENTILLA CANADENSIS L. 
Common in fields and thickets. Freshly in flower May 30, 
1909, June 3, IQII. 
POTENTILLA SIMPLEX Michx. 
Frequent in damp thickets and low grounds; first flowers June 
2, 1909, June 7, 1908. 
