132 NEW YORK STATE MUSEUM 



Silverweed; Wild or Goose Tansy 



Argentina anserina (Linnaeus) Rydberg 



Plate pzb 



Stems and leaves herbaceous and tufted from a perennial root ; spreading 

 by slender runners, 8 inches to 3 feet long. Leaves pinnate, 3 to 18 inches 

 long; leaflets seven to twenty -five, oblong, oblanceolate or obovate, obtuse, 

 the lower leaflets usually smaller, often with still smaller ones interspersed, 

 all sharply toothed, nearly glabrous above, white or silky-pubescent beneath. 

 Flowers yellow, three-fourths to i| inches broad, solitary on erect axillary 

 peduncles; petals five, broadly oval or obovate, longer than the five ovate, 

 pointed sepals and the five oval bractlets; stamens about twenty, borne 

 around the base of the hemispheric, villous receptacle. 



Lake shores, sandy fields and salt meadows, New Jersey to Greenland, 

 west to Nebraska, British Columbia and Alaska, south in the Rocky 

 mountains to New Mexico and California; also in Europe and Asia. 

 Flowering from May to September. Consists of several or numerous 

 races, differing in the size and shape of the leaflets, and slightly in the 

 achenes. Small northern plants have been referred to A . e g e d i i of 

 Greenland, and a form from Oneida lake has been described as A. b a b- 

 c o c k i a n a Rydberg. 



Purple or Marsh Cinquefoil; Purplewort 



Comarum palustre Linnaeus 



Plate 963 



Stems decumbent, often rather long, somewhat woody and perennial 

 at the base; pubescent above. Leaves pinnate, upper leaves three to 

 five-foliate, nearly sessile, lower ones successively longer petioled, five 

 to seven -foliate; leaflets oblong or oval, sharply toothed, blunt or pointed 

 at the apex, narrowed at the base, i to 3 inches long; petioles sheathed 

 at the base by large membranous stipules. Flowers conspicuous, three- 

 fourths to i inches broad; calyx deeply five-lobed with five narrow bractlets, 



