Genus i. ROSE FAMILY. MS 



** Carpels opposite the sepals ; stipules persistent (Sorearieae). 



Petals obovate or spatulate. imbricated : leaves pinnate. 4. Schiconotns. 



Petals strap-shaped, convolute in the bud ; leaves trifoliolate. 5, Porteranlhus. 



B. Fruit indehiscent, of achenes or drupelets. 



* Carpels not enclosed in the fleshy calyx-tube (hypanthium). 



I. Fruit of dry achenes. 



Ovaries 2-ovuled (Ulmarieae). 6. Filifendula. 



Ovaries i-ovuled. 



Seed pendulous or ascending, borne in the ovary opposite to the base of the style. 



Style articulated with the ovary: calyx-tube from campanulate to nearly flat (Potentilleae). 

 Style terminal or nearly so ; ovule and seed pendulous. 7. Potentilla. 



Style lateral : ovule and seed ascending. 

 Herbs : achenes glabrous. 



Achenes numerous : stamens about 20. 

 Leaves odd-pinnate. 



Receptacle not enlarged in fruit ; petals yellow, obtuse or retuse. 



8. Argentina. 

 Receptacle somewhat enlarged in fruit, spongy ; petals red, acute or acuminate. 



9. Comarum. 

 Leaves 3-foliolate : receptacle much enlarged in fruit. 



Receptacle not pulpy: petals yellow. 10. Duchesnea. 



Receptacle very pulpy : petals w'hite or pinkish. 11. Fragnria. 



Achenes 10-1.=; ; stamens 5: leaves 3-foliolate. 12. Sibbaldia. 



Shrubs : achenes hairy. 



Style filiform : leaves 3-foliolate. 13. Sihhaldiofisis. 



Style club-shaped : leaves pinnate. 14. Dasifhora. 



Style nearly basal : ovule and seed ascending. 



Stamens numerous; flowers bracteolate ; leaves pinnate. i.e;. Drymocallis. 



Stamens 5 ; flowers ebracteolate : leaves 2-3-ternateIy compound. t6. Chamaerltodos. 

 Style not articulated with the ovary : calyx-tube urn-shaped or cup-shaped, contracted at the 

 throat or mouth. 

 Style nearly basal ; inflorescence cymose : petals none CAlchemilleae'), 



Perennial herbs : stamens 4, alternate with the sepals. 17. Alchemilla. 



Small annual herbs; stamen i, opposite a sepal, rarely 2-5. 18. .4phanes. 



Style terminal ; inflorescence spicate. racemose or capitate CSanguisorbeae). 

 Calyx-tube not prickly ; petals none. 

 Stamens 2-4, not declined : pistil i. 



Perennial herbs; stigma papillose: leaflets toothed. ig. Sangiiisorba. 



Annual or biennial herbs : stigma brush-like : leaflets pectinate-pinnatifid. 



20. Potcridium. 

 Stamens of staminate flowers numerous, declined : pistils 2. 21. Potcrium. 



Calyx-tube and fruit prickly ; petals present, yellow. 22. .igrimonia. 



Seed erect, basal. 



Style wholly deciduous (Colurieae). 23. Waldsteinia. 



Style persistent in whole or in part. 



Calyx-tube hemispheric to turbinate, persistent ; herbs CDryadeae). 

 Calyx-lobes and petals 5 : leaves pinnate. 



Styles jointed, the upper part deciduous. 24. Geitm. 



Styles not jointed, wholly persistent, mostly plumose. 25. Sicvcrsia. 



Calyx-lobes and petals 8 or q ; leaves simple ; styles plumose. 26. Dryas. 



Calyx-tube salver-shaped, the limb deciduous ; the tube persistent, investing the achene : 

 shrubs or trees ( Cercocarpeae). 27. Cercocarpus. 



2. Fruit of fleshy or nearly dry drupelets : ovary j-ovuled (Rubeae). 



Drupelets very pulpy. 28. Ruhus. 



Drupelets nearly dry. enclosed by the calyx. 29. Dalibarda. 



** Carpels enclosed in the fleshy calyx-tul)e (Roseae). 30. Rosa. 



I. OPULASTER Medic. Pfl. Anat. 2: 109. 1799. 



[Physocarpa Raf. New Fl. N. .A. 3: 73. 1836.I 

 fPHYSocARPrs Maxim. Acta Hon. Pctrop. 6: 219. 1879.] 



Branching shrubs, with petioled simple palmately lobed leaves, and white flowers in ter- 

 minal corymbs. Calyx campanulate, 5-lohed. Petals 5, rounded, inserted in the throat of 

 the calyx. Stamens 20-40. inserted with the petals. Pistils 1-5, short-stipitate, when 5 alter- 

 nate with the calyx-lobes. Stigma terminal, capitate. Pods 1-5. inflated, in our species at 

 length dehiscent along both sutures, 2-4-seeded. Seeds ovoid or globose, crustaccotis, shin- 

 ing; endosperm copious. [Greek, resembling Opnlns, the cranberry-tree.] 



Species about 12, of North America, and i in Mantchuria. Type species: Spiraea opuIifoUa L. 

 Follicles glabrous, shining. r. O. opulifolius. 



Follicles stellate-pubescent. 2. O. intennedius. 



