Potentilla Rosaceae 565 



fact that I had published a correction. There is, however, a specimen 

 collected by T. G. Yuncker in the herbarium of DePauw University. It 

 was collected along a roadside near Greencastle, Putnam County, where it 

 was established. There is a specimen from Montgomery County in the 

 herbarium of Wabash College. It was collected by A. R. Bechtel in 

 Crawfordsville, where it has escaped and become established. This species 

 is a rare introduction since there are only four records from this state 

 and only one report from Ohio. 



Nat. of Eurasia; s. N. Y. to Mo., southw. to Fla. and Ark. 



3356. POTENTlLLA L. Cinquefoil 



Stems distinctly woody, usually 3-10 dm high; leaves pinnate, leaflets 5-7, entire. 

 1. P. fruticosa. 



Stems herbaceous. 

 Leaves pinnate. 



Mature plants erect, stout, villous-pubescent; leaflets 7-11, thick, double-serrate; 

 terminal leaflet of lower leaves usually 3-4 cm wide ; plants of a moist prairie 



or dry habitat 2. P. argata. 



Mature plants decumbent or in age with runners rooting at the nodes; leaflets 

 5-25, thin, serrate; terminal leaflet of lower leaves less than 3 cm wide; plants 

 of a wet habitat. 

 Calyx green within; leaflets 7-25, with smaller intermediate ones, silvery- 

 pubescent beneath but not glaucous; flowers solitary, axillary. 3. P. Anserina. 

 Calyx maroon within; leaflets 5-7, without smaller intermediate ones, glaucous 



beneath; flowers cymose 4. P. palustris. 



Leaves palmate. 



Flowers cymose; peduncles short. 

 Leaflets green beneath. 



Leaflets 5-9; plants tall, not divided at the base. 



Petals 7-10 mm long, exceeding the calyx, pale yellow; stems green 



5. P. recta. 



Petals 3-7 mm long, usually shorter than the calyx or scarcely exceeding it, 

 deep yellow; stems reddish; leaflets wider and deeper green than those 



of the preceding. (See excluded species no. 366, p. 1062.) 



P. recta var. obscura. 



Leaflets 3; petals shorter than the sepals, deep yellow 6. P. monspeliensis. 



Leaflets silvery-pubescent beneath, 5 ; plants much divided at the base, the lower 



branches often prostrate; petals small, about 4 mm long 7. P. argentea. 



Flowers solitary, axillary; stem soon becoming procumbent and usually rooting 

 at the tips if in contact with soil. 

 First flower borne in the axil of the leaf from the first well-developed node 

 when the stem is 1-1.5 dm high; mature stems 0.5-1 mm in diameter at 



the base. (See excluded species no. 367, p. 1063,) P. canadensis. 



First flower borne in the axil of the leaf from the second well-developed node 



when the stem is generally 1-4 dm high; mature stems 1-3 mm in diameter 



at the base. 



Leaves green and more or less strigose-pubescent or slightly whitened but 



not copiously silvery-sericeus beneath. 



Stems (especially when young) hirsute or villous-hirsute, with spreading or 



somewhat appressed hairs 8. P. simplex var. typica. 



Stems strigose with short, appressed hairs or glabrate. (This form to be 



sought in Indiana.) P. simplex var. calvescens. 



Leaves densely silvery-sericeus beneath; pubescence of stems spreading, 

 usually dense 8a. P. simplex var. argyrisma. 



