106 FARM WKEDS OF CANADA 



UPRIGHT CINQUEFOIL (Potentilla monspeliensis L.) 



Other English name: Rough Cinquefoil. 

 Other Latin name: Potentilla hirsuta Michx. 



Native. Annual. Erect, branching, rough-hairy. The 3 

 leaflets of each leaf are obovate; those of the top leaves, which 

 are stalkless are toothed nearly the whole length. The mode 

 of flowering is a leafy, rather close cyme of yellow flowers. The 

 seeds are grouped together on the receptacle, which is long, 

 thin and downy. 



The seed (Plate 74, fig. 45) when ripe is leather-brown, 

 dull, about 1/30 of an inch long, bluntly comma-shaped, with 

 curved branching veins running longitudinally. Commonly 

 found in timothy seed. 



Time of flowering: June-July; seeds ripe July to September. 



Propagation : By seeds. 



Occurrence : Widely distributed throughout Canada. 



Injury: A weed of secondary importance, common in old 

 meadows and worn-out sandy soils. 



Remedy: Repeated close cutting will keep it in check in 

 waste places. It will not long give trouble on land worked under a 

 short rotation of crops, including clover and hoed crops once 

 every four years. Good drainage and enrichment of the soil 

 will stimulate a more vigorous growth of cultivated crops and 

 choke out this weed. 



ALLIED SPECIES: The genus Potentilla is widely distrib- 

 uted, comprising many species closely related to the Upright 

 Cinquefoil, as Potentilla monspeliensis L., var. norvegica (L.) 

 Rydb., also commonly called Upright or Rough Cinquefoil. It 

 is distinguished by less hairyness and by somewhat more narrow- 

 ly oblong leaves. Both occur in similar situations and have 

 about the same distributive range. 



The seeds of the cinquefoils are very similar and their 

 identification is sometimes difficult. They vary only slightly 



