336 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Poterium annuum Nutt.; Hook. Fl. Bor. Am. 1: 198. 1834. 
Tyre Looaity: ‘Red River in Louisiana.” 
Ranae: Vancouver Island to California and Arkansas. 
SPECIMENS EXAMINED: Klickitat County, Howell; Fourth Plain, Piper, July 14, 1899; 
Pullman, Piper 1537; Clarks Springs, Kreager 106. 
ZONAL DISTRIBUTION: Arid Transition. 
2. Sanguisorba latifolia (Hook.) Coville, Contr. Nat. Herb. 3: 339. 1896. 
Sangquisorba canadensis latifolia Hook. Fl. Bor. Am. 1: 198. 1834. 
Sanquisorba sitchensis C. A. Meyer; Trautv. & Meyer, Fl. Ochot. 35. 1856. 
Poterium sitchense S. Wats. Bibl. Ind. 303. 1878. 
Type Locatity: ‘Observatory Inlet.’ Collected by Scouler. 
RanGe: Alaska to Oregon and Idaho. 
SPECIMENS EXAMINED: Silverton, Bouck in 1889; Snoqualmie Pass, Piper; Big Creek 
Prairie, Lamb 1394; Fort Vancouver, collector not indicated; Skamania County, Suksdorf 
966; Blue Mountains, Horner 415. 
ZONAL DISTRIBUTION: Canadian. 
The red-flowered form of this species is referred by Howell to S. officinalis L. The 
white-flowered ordinary form was referred to S. media L. in Hooker’s Flora. It is also 
the basis for the entry ‘ Poterium canadense B. & H.?”’ of Suksdorf’s list. 
POTENTILLA. 
Cymes leafy; annuals or biennials with small flowers. 
Lower leaves pinnate, upper ternate ............------------ 1. P. rivalis. 
Leaves all ternate. 
Petals as long as the sepals ...... .- - Le eee ee eee ee ee eee 2. P. monspeliensis. 
Petals much shorter than the sepals. 
Cymes loose, rather broad; leaflets oblanceolate... - - - 3. P. millegrana. 
Cymes narrow, elongated; leaflets obovate... ....-.-- 4, P. biennis. 
Cymes not leafy; perennials. 
Leaves pinnate. 
Flowers white; receptacle long-bristly .....-...--------- 16. P. newberryi. 
Flowers yellow; receptacle not long-bristly. 
Calyx silky; leaflets 1 to 2 cm. long..........-..---- 14. P. cascadensis. 
Calyx hairy; leaflets 2 to 6 cm. long .............-.. 15. P. drummondii. 
Leaves digitate. 
Leaflets 3. 
Plant densely silky-villous ......-..---------------- 12. P. villosa. 
Plant glabrous or nearly so .........-.------------- 13. P. flabellifolia. 
Leaflets 5 to 9. 
Low alpine plant, 20 to 30cm. high; cyme few flowered. 5. P. disseeta. 
Taller lowland plants, 40 to 80 cm. high; cymes many 
flowered. 
Leaflets pubescent on both sides. 
Pubescence tomentose .-....-.------------ 6. P. permollis. 
Pubescence grayish-silky .........-.---.--. 7. P.fastigiata. 
Leaflets glabrous at least above. 
Under side of leaves white tomentose. 
Teeth of the leaflets triangular ........- 8. P. gracilis. 
Teeth of the leaflets elongate ...-...-.- 9. P. blaschkeana. 
Under side of leaves green. 
Leaflets slightly tomentose beneath .... 10. P. viridescens. 
Leaflets glabrous on both sides .......-- 11. P. nuttallii. 
a}k\.N. W. Am. 170. 1898. 
