Jan., 1915.] 
The Roses of Ohio. 
421 
18. Leaves pinnate with smaller leaf segments between the larger ones; 
calyx with hooked prickles; flowers with petals in narrow racemes. 
Agrimonia (18). 
18. Leaves pinnate without the smaller leaf segments; calyx without 
prickles; flowers without petals in heads or spikes. 19. 
19. Leaves %-2^2 in. long; stamens!; inflorescence a spike. Sanguisorba.( 19) 
19. Leaves in- long; stamens numerous; inflorescence a head. 
Poterium. (20). 
1. Geum. Avens. 
Perennial herbs with pinnate or pinnatified leaves with stipules; 
flowers solitary or cymose—corymbose; perianth segments 5 
each; stamens numerous; achenes numerous on a dry receptacle, 
the persistent styles being straight or jointed, naked or plumose; 
seed erect, testa membranous. 
1. Flowers purple; calyx lobes erect or spreading; style plumose below. 
G. rivale. (1). 
1. Flowers white or yellow; calyx lobes strongly reflexed in fruit; style 
not plumose. 2. 
2. Calyx without bracts; flowers less than in. broad, yellow; head of 
fruit long stalked. G. vernum. (6). 
2. Calyx bracteolate; flowers in. broad. 3. 
3. Petals white. 4. 
3. Petals yellow or cream yellow. 5. 
4. Plants glabrate or softly pubescent; receptacle bristly. G. canadense. (2). 
4. Plants rough-pubescent; receptacle glabrous or downy. G. virginianum. (4) 
5. Stems bristly-hairy, lj^-3 ft. tall; petals cream-yellow, small, rarely 
exceeding the sepals. G. flavum. (3). 
5. Stems pubescent, 2-5 ft. tall; petals yellow, large, much exceeding the 
sepals. G. strictum. (5). 
1. Geum rivale L. Purple Avens. Erect herbs, Ip2-2J^ ft. 
high; basal leaves pinnate, the side leaflets being much smaller 
than the terminal leaflets, irregularly lobed and dentate; stem 
leaves simple or 3-parted; flowers purple, styles becoming plumose 
in the fruit. Geauga, Champaign. 
2. Geum canadense Jacq. White Avens. Erect, softly 
pubescent or glabrate herbs, branched at the top, 1^-3 ft. high; 
leaves 3-parted, ovate or obovate, velvety pubescent or glabrate 
beneath; flowers, white. General. 
3. Geum flavum (Port.) Bickn. Cream-colored Avens. 
Stems erect, kK-3 ft. tall, bristly-hairy below; stipules large, 
foliaceous; leaves usually pinnate, those above sometimes entire; 
flowers cream-yellow; head of fruit sessile. No specimens. 
4. Geum virginianum L. Rough Avens. Stems with bristly 
hairs 1 / 4-2 ft. high; petals creamy-white, rather inconspicuous, 
being exceeded by the sepals; receptacle glabrous or downy. 
Lorain, Wyandot, Highland, Wayne, Fulton, Madison, Mercer, 
Licking, Richland, Knox, Clinton, Huron, Gabon, Defiance, 
Harrison, Fayette, Morrow, Tuscarawas, Williams. 
