310 ICOSANDRIA. rOLYGTNIA. 



Jlorum. Ph. Obs. Stem mostly S-flowered, producini^ 

 about 2 pair of small leaves, which are connate at the base, 

 having larg-e divaricate and adnate stipules; peduncles 

 elongated, bracteolate; calix subcampanulatc, smaller seg- 

 ments longest, petals white, subovate; awns of the seed 

 straight, conspicuously villous, twice as long as the calix. 

 Hae. Around Port Mandan on the Missouri. A remark- 

 able species, allied to G. AnemoyioideSy but having pilose 

 leaves and a villous stem and calix. 



A North American genus, of which there are also 6 spe- 

 cies in Europe, 1 in Japan, 1 in Barbary, 2 at the Straits of 

 Magellan, and 2 equally indigenous to Kamtschatka and 

 Korth America. 



349. POTENTILLA. X. (Cinquefoil.) 



Calix 10-cleft, inferior, spreading, 5 of tl»e 

 segments alternately' smaller. Petals 5. Seeds 

 mostly rugose, roundisli, naked, attached to a 

 small jiiiceless receptacle. 



A numerous genus of herbaceous plants (only 3 species 

 shrubby,) with pinnate, digitate or ternately divided 

 leaves; petioles aluted towards the base by the adnate sti- 

 pules; flowers often corymbosely fasciculated and termi- 

 nal, yellow, rarely white. 



Species. 1. V . tridentata. 2. emarginata. Ph. o-ni- 

 •vea. 4. villosa. Pallas. 5. }iirsuta. 6. norivegica. 



7. recta? Leaves all in sevens, digitate, villous beneath; 

 leaflets cuneate-oblong, semipinnatifid, obtuse; stipules 

 subovate; stem erect, many-flowered, panicle divaricate; 

 flowers subfastigiate; petals roundish, yellow. Hab. In 

 depressed situations, on the plains of tlie Alissoun near 

 Fort Mandan. Flowering in May or June. ^. pumila. 9. 

 canadensis. 10. simplex. 11. opaca. 12. dissecta. 13. ar- 

 gentea. From Canada to the state of New-York. 



14. * humif%isa. Leaves digitate, quinate, leaflets cune- 

 ate-oblong, obtuse, incisely dentate, beneath white and to- 

 mentose; flower-stems short and filiform, procumbent, not 

 creeping. Hab. On high gravelly hills near Fort Man- 

 dan, Missouri. Flowering" about April or May. Obs. 

 Root subcespitose not creeping; leaves all radical, deep 

 green and pubescent above, white and tomentosi beneath; 

 flowering stems 4 or 5 inches long, filiform, flagellate, 

 without leaves, producing a few yellow? flowers but no 

 roots. 



15. fruticosa. 16. Au'^erina. 17- pensyJvanica. In Cana- 

 da, and on the plains of tiie Missouri. 18. siipina. 



A genus ()f near 60 sptcies, almost exclusively indige- 

 nous to the northern regions of Europe, America, and 



