42 2 The Ohio Naturalist. [Vol. XV, No. 3, 



5. Geum strictum Ait. Yellow Avens. Stems hairy, l>^-2^ 

 ft. high. Stem leaves pimiate, much incised, leaflets 3-5, rhombic- 

 ovate; stipules large, foliaceous; flowers yellow; petals longer than 

 the sepals, orbicular in shape. Knox, Ashtabula, Summit, Wayne, 

 Lake, Stark, Lorain, Cuyahoga, Fairfield, Geauga, Preble. 



6. Geum vernum (Raf.) T. & G. Spring Avens. Stem 

 erect, glabrous, or with a few scattered hairs ; basal leaves orbicular 

 or cordate, 3-5 lobed, sometimes pinnate; stem leaves narrowly 

 pinnate or pinnatified; flowers yellow, head of fruit long stalked. 

 Hancock, Montgomery, Clark, Warren, Lucas, Erie, Lorain, 

 Delaware, Greene, Hamilton, Pickaway, Crawford, Hardin, 

 Clermont, Preble, Huron, Licking, Franklin, Pike, Auglaize, 

 Washington, Madison, Morrow. 



2. Dasiphora. 



Stems shrubby, erect, with dry sheathing stipules and pinnate 

 leaves; flowers solitary or in small cymes; petals and sepals 5; 

 stamens about 25 in 5 festoons on the thickened margin of the 

 disk; achenes numerous, densely covered with hairs. 



1. Dasiphora fruticosa (L.) Rydb. Shrubby Cinquefoil. 

 Shrubs Yi-iyi ft. high, with shaggy bark; leaflets 5-7, oblong, 

 entire, with long, silky hairs; flowers yellow, f-| in. broad. 

 Erie, Champaign, Wyandot, Clarke, Montgomery, Summit, 

 Portage, Stark, Logan. 



3. Potentilla. Cinquefoil, Five-finger. 



Herbs or shrubs with digitate or pinnate, compound leaves; 



flowers cymose or solitary, yellow in ours; calyx 5-lobed (rarely 



4-lobed), 5-bracteolate (rarely 4-bracteolate) , persistent; petals 5, 



rarely 4) ; carpels inserted on a dry, usually pubescent receptacle. 



1. Flowers cymose; erect or ascending herbs. 2. 



1. Flowers solitary, axillary; prostrate or creeping herl:)s. 5. 



2. Leaves pinnately 3-11-foliate. P. paradoxa. (Ij. 



2. Leaves palmately3-7-foliate. 3. 



3. Leaflets 3. P. monspeliensis. (4). 



3. Leaflets 5-7. 4. 



4. Leaflets crenate, green beneath; lower stipules leaf-like; petals dark 



yellow. P. recta. (3). 



4. Leaflets laciniate or incised, while-i albescent beneath; stipules not 



leaflike. P. argenlea. (2). 



5. Flowers 4-parted, upper leaves 3-parted. P.reptans. (7). 



5. Flowers .o-parted; leaves usually all 5-foliate. 6. 



G. Stems long, a.scending at first, 5-14 in. high, later decumbent; pubescence 

 of petioles, stems and peduncles spreading. P. canadensis. (5). 



6. Plants low, not more than 4 in. high with very slender runners; 



pubescence of petioles, stems and peduncles oppressed. P. pnmila. (6). 



1. Potentilla paradoxa Nutt. Bushy Cinquefoil. Plants 

 stout, bushy; stems decumbent or erect; leaves pinnately 5-11- 

 foliate; leaflets obovate or oval, deeply incised; flowers borne 

 in leafy cymes. Erie County. 



