ICOSANDRIA. POLYGYNIA. 309 



minate; petals oblong- -ovate, white. Hab. On the island 

 of Miciiiiimackinak, lake Huron, 14. saxatilis. 15. obovaUs. 

 16. arcticus. 17 . piatiUatus. 18. pedaius. 19. Chamcemorus. 

 A widely dispersed genus of about 50 species, extend- 

 ing from the arctic circle, throughout Europe to the West 

 Indies, and passing the equator, species are also found 

 in Peru, Chili, Japan, China, the islands of the Pacific, 

 and on the continent of India. 



346. DALIBARDA. L, 



Calix inferior 5-cleft, spreading. Petals 3, 

 Styles 5 to 8, long and deciduous. Seeds dry. 



Small herbaceous plants with creeping perennial roots; 

 scapes 1 or few flowered, flowers white or yellov/; leaves 

 entire or ternateiy divided. 



Species. 1. D. repens. 2. Fragarieides. Flowers 

 yellow. This species is also found in Siberia. — Of 

 this genus there is but another species indigenous to the 

 Straits of Magellan. 



347. DRYAS. L. (Mountain Avens.) 



Calix inferior, simple, 8-cleft. Petals 8. 

 Seeds many, caudate, plumose. Receptacle de- 

 pressed. 



Low and suffruticose alpine plants, partly cespitose; 

 leaves alternate undivided, margin entire or serrated, un- 

 der, side white and tomentose; stipules adnate to the pe- 

 tiole; peduncles solitary, 1 -flowered; flowers white. 



Species. 1. D. octopetala. 2. integrifoUa. (D. tenella. 

 Ph.) On the White Hills of New Hampshire. 



A genus of 2 species, comraonto the northern parts of 

 Europe and America. 



S48. GEUM. L. (Avens.) 



Calix 10-cleft, inferior, segments alternately 

 smaller. Petals 5. Seeds awned, awn naked 

 or bearded, mostly geniculate. 



Herbaceous plants mostly producing pinnately divided 

 alternate leaves, with the terminal segment usually larger, 

 stipules adnate to the petiole; peduncles terminal or ax- 

 illary fiew-flowered. 



Species. 1. Q. stnctum. 2. agrimonoides. Ph. 3. al- 

 bum. A. virginiamim. 5. geniculatum. 6. rivale. 7- cilia- 

 turn. Ph. 8. radiatum. 9. Peckii. Ph. Radical leaves 

 reniform. Is this plant ind.-ed a Genm? 10. Anemonoideg, 

 Also indigenous to Kamtschatka as well as No. 8. 1 J . tn- 



