206 ROSACEAE (ROSE FAMILY) 
rather small, the five rounded, pale yellow petals being less 
than half as long as the hairy, pointed, persistent calyx-lobes which 
are subtended by bracts still longer; stamens many. After the 
flower has been fertilized the long calyx-lobes close protectingly 
over the cone-like heads until the many small achenes have 
ripened and are ready to be scattered by the swaying of the tall 
weed in the wind. (Fig. 148.) 
Means of control 
Close cutting while in first bloom; cultivation of the ground for 
one or two seasons. 
SILVERY CINQUEFOIL 
Poteniilla argéntea, L. 
Native. Perennial. Propagates by seeds. 
Time of bloom: May to September. 
Seed-time: Late June to November. 
Range: Nova Scotia to the Dakotas, southward to Maryland and 
Kansas. Native also to Europe and Asia. 
Habitat: Dry soil; fields, meadows, and pastures. 
The plant from which this description 
is written was pulled from a sidehill grass 
lot, on which the grass was burned brown 
and apparently dead from the drought — 
but the weed did not appear to be suffer- 
ing. Root deep, hard, and woody, with 
branching, fibrous rootlets. Stems tufted, 
spreading, three inches to a foot in length, 
also coarse and woody, covered with woolly 
white hair. Leaves palmately five-foliate, 
usually less than an inch broad, smooth 
and green above but silver-white beneath 
with woolly hair; leaflets wedge-shaped, 
deeply cut, entire toward the base, with 
margins revolute. Flowers in cymose clus- 
; ters, terminal on short pedicels, about a 
Re ie eae quarter-inch broad, the calyx white-woolly, 
argentea). x}. the five rounded petals greenish yellow, 
