132 Order ROSALES 
Styles lateral, flowers white. 
Caulescent; leaves pinnate; receptacle dry. 
2. Drymocallis. 
Acaulescent; spreading by runners; leaves trifoliolate; 
receptacle fieshy, edible. 3. Fragaria. 
Styles elongating in fruit, often plumose and jointed. 
4, Geum. 
Fruits drupelets, aggregated into berry-like clusters; calyx 
not bracted. 5. Rubus. 
Pistils enclosed in the receptacular cup or hypanthium. 9. Rosa. 
Carpels few, often only one. 
Herbs; achenes enclosed in the dry urn-shaped receptacle. 
Petals none, sepals petaloid, without prickles; flowers in 
dense heads or spikes, with one carpel. 7. Sanguisorba. 
Petals yellow, calyx prickly, flowers in racemes, carpels 2. 
8. Agrimonia. 
Trees or shrubs; flowers with one carpel. 
Petals none, style persistent, long and plumose; fruit an 
acnene. 6. Cercocarpus. 
Petals present, fruit a drupe. 14. Prunus. 
Carpels united to each other and to the receptacular cup; fruit a 
ome. 
Inner wall of the ripe carpels bony; ovule one in each carpel, or 
if 2, dissimilar. 12. Crategus. 
Inner wall of the ripe carpels papery. 
Pome 5-6 cm. in diameter, cells as many as the styles, 2- 
seeded. 11. Malus. 
Pome less than 1 cm. in diameter, cells twice as many as the 
styles, 1-seeded. 13. Amelanchier. 
Carpels with several ovules, 2—4-seeded, dehiscent. 10. Opulaster. 
1. Potentilla. 502. 
Flowers terminal, cymose. 
Leaves pinnate. 
Leaves white tomentose, especially so beneath. 
Leaves glabrous above; stipules pectinately parted. 
1. P. pennsylvanica. 
Leaves silky above; stipules entire or nearly so. 2. P. hippiana. 
Leaves not white tomentose. 6. P. paradoxa. 
Leaves digitate, 3-5-foliolate. 
Stamens 10-20. 
Plant erect; flowers 6-12 mm. broad. 3. P. monspeliensis. 
Plant decumbent or ascending; flowers about 4 mm. broad. 
5. P. millegrana. 
Stamens 5-8. 4, P. pentandra. 
Flowers solitary on axillary peduncles. 7. P. anserina. 
1. Potentilla pennsylvanica L. Prairie Cinquefoil. 
Common throughout the state. Deuel county; Dismal River; Ken- 
nedy; Saunders county; Sheridan county; Thedford; Weeping Water. 
2. Potentilla hippiana Lehm. Woolly Cinquefoil. 
In the northwestern part of the state. Belmont; Ft. Robinson; Har- 
rison. 
3. Potentilla monspeliensis L. Rough Cinquefoil. 
Common, probably over most of the state. Belmont; Cass county; 
Cherry county; Dakota county; Lincoln; Ponca; Walton; Whitman. 
