176 CONTRIBUTIONS FBOM THE NATIONAL HERBARIUM. 



3. Geum cana dense Jacq. 



Borders of woods; common. June-July. Eastern U. 8. (0. album Gmel.) 



4. Geum meyerianum Ilydb. 



Moist ground; infrequent. July-Aug. Northern states, south to Md . 



5. Geum hirsutum Muhl. 



Woods and banks; rare; Seven Locks (Steele), July. Conn, to Ga. 



6. Geum strictum Ait. 



Low meadows; frequent. June. Northern states, south to Md. 



10. POTENTILLA L. Five-finger. 



Leaves pinnately compound 6. P. anserina. 



Leaves palmately compound. 

 Flowers solitary on long axillary peduncles. Plants with prostrate shoots or run- 

 ners. 

 Earliest flower from the node above the first well-developed internode. 



1. P. pumila. 

 Earliest flower from the node above the second or third well-developed internode. 



2. P. canadensis. 

 Flowers in cymes. 



leaflets 3 3. P. monspeliensis. 



Leaflets 5-7. 



Leaflets green beneath 4. P. recta. 



Leaflets silvery beneath 5. P. argentea. 



1. Potentilla pumila Foir. 



Dry ground and <dd fields; frequent. May. Me. to Md. (P. canadensis of Ward's 

 Flora.) 



2. Potentilla canadensis L. Five-finger. 

 Open ground; frequent. May. Eastern U. S. (P. canadensis simplex of Ward's 



Flora.) 



3. Potentilla monspeliensis L. 



Moist open ground; frequent. July. Nearly throughout N. Amer. ; also in Eur. 

 (P. norvegica i^.) 



4. Potentilla recta L. 



Fields; rare. June. Northern states, south to Md.; adventive from Eur. 



5. Potentilla argentea L. 



Barren places; rare. June. Northern states, south to Md. 



6. Potentilla anserina L. Silver- weed. 



Moist open ground; rare. Northern* states, south to Md. (Argentina anserina 



Rydb.) 



11. AGRIMONIA L. Agrimony. 



Axis of racemes villous. Fruit (5 mm. wide; root not thickened 1. A. gryposepala. 



Axis of racemes appressed-pubescent and often glandular, but not villous. 

 Leaflets glabrous beneath or with a few scattered spreading hairs; fruiting calyx 



hemispheric 2. A. rostellata. 



Leaflets pubescent beneath; fruiting calyx topshaped. 



Leaflets narrowly lanceolate, the principal ones 9-13 or more; root not tuberous. 



3. A. parviflora. 

 Leaflets oblong or elliptic, mostly 5-7; root tuberous-thickened.. 4. A. pubescens. 



1. Agrimonia gryposepala Wallr. 



Dry woods; infrequent. Aug. Xbrt hern states, south to Va. (.1. hirsuta Bicknell.) 



2. Agrimonia rostellata Wallr. 



Pocky woods; frequent. Aug. Conn, to Ga. (A. eupatoria of Ward's Flora.) 



