THE ROSES OF OHIO. 



Rose Gormley. 



RosACEiE — Rose Family. 



Herbs, shrubs, or trees with bisporangiate, rarely diecious, 

 actinomorphic, perigynous flowers, and alternate, simple or 

 compomid, usually stipulate leaves; perianth usually pentam- 

 erous, the calyx often bracteolate; stamens usually numerous, 

 anthers with four microsporangia; carpels one to many, distinct 

 or united with each other and the hypanthium; ovulary uni- 

 locular or in cases of united carpels 2-10-locular; style terminal 

 or lateral; ovules one to several, anatropous; fruit usually follicles, 

 achenes, drupes or pomes ; endosperm usually none, rarely copious. 



Subfamily, Rosat^e. 



Carpels several or numerous or occasionally only one and 

 then the fruit a dry, one-seeded achene ; hypanthium free from the 

 carpels, usually membranous, but sometimes becoming dry or 

 fleshy in the fruit, fruit follicles, achenes, aggregates of drupelets, 

 or with fleshy receptacle. 



SYNOPSIS. [ 



I. Carpels not enclosed in the hypanthium; calyx not enclosing the 

 carpels. 



a. Carpels numerous, ripening into 1-2-seeded achenes or 

 drupelets. 



1. Style persistent; fruit an achene. 



1. Geum. (1). 



2. Style deciduous; fruit an achene. 



2. Dasiphora. (2). 



3. Potentilla. (3). 



4. Argentina. (4). 



5. Comarum. (5). 



6. Drymocallis. (6) 



7. Waldsteinia. (7). 



8. Fragaria. (8). 



3. Style persistent; fruit a drupelet. 



9. Rubus. (9). 



b. Carpels usually not more than 10, ripening into 1-4-seeded 

 follicles. 



1. Flowers bisporangiate. 



10. Porteranthus. (10). 



11. Schizonotus. (11). 



12. Fihpendula. (12). 



13. Opulaster. (13). 



14. Spiraea. (14). 



2. Flowers diecious. 



15. Aruncus. (15). 



II. Carpels at length enclosed in the connivant, zygomorphic calyx 

 segments; styles deciduous; with normal or cleistogamous flowers. 



16. Dalibarda. (16). 



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