Jan., 1915.] The Roses of Ohio. 429 



17. Rosa. Rose. 



Erect or climbing shrubs, usually with prickly stems; leaves 

 odd-pimiate; stipules adnate to the leaves ; flowers showy, bisporan- 

 giate; hypanthium urn-shaped, becoming fleshy in the fruit; 

 ovularies hairy, ripening into bony achenes. 



1. Leaflets mostly 3; styles united in a slender exserted column; prickles 

 very stout, almost as broad at the base as long. R. setigera. (6). 



1. Leaflets 5-9; styles distinct; prickles recurved or straight and slender, 



not nearly so broad as long. 2. 



2. Leaflets small, V2-% in- long, orbicular to ovate, pale beneath and 



very glandular. R. riibiginosa. (4). 



2. Leaflets larger, %-2 in. long, ovate to narrowly oblong, not glandular, -i. 



3. Leaflets ovate, rounded at the base, doubly and glandular serrate; 



flowers deep pink to crimson, 2-3 in. broad. R. gallica. (5). 



3. Leaflets oblong, acute at the base, not prominently glandular, serrate; 



flowers pink, 1-2 in. broad. 4. 



4. Stems smooth or with very few weak prickles; flowers on smooth 



peduncles; sepals erect on the fruit, not deciduous. R. blayida. (1). 



4. Stems with straight prickles, usually in pairs; sepals spreading, decid- 



uous. 5. 



5. Prickles stout and recurved; leaflets finely serrate; stipules convolute; 



hypanthium bristly. R. Carolina. (2). 

 5. Prickles slender and straight; leaflets coarsely dentate; stipules flat. 



R. virginiana. (3). 



1. Rosa blanda Ait. Smooth Rose. Stems 1-5 ft. high, 

 usually without prickles; leaflets 5-7, ovate or 9blong-lanceolate, 

 thin; flowers pink, about 2 in. broad. Lorain, Mercer, Clennont, 

 Erie, Clinton, Wilhams, Lake. 



2. Rosa Carolina L. Swamp Rose. Stems l-8>2 ft. tall 

 with stout, straight or curved prickles; leaflets 5-9, usually 

 7, dark green, narrowly oblong, flnely serrate, usually pubescent 

 beneath; flowers pink, 1^ in. broad, corymbose or rarely solitary. 

 Franklin, Holmes, Trumbull, Hocking, Stark, Logan. Defiance, 

 Gallia, Crawford, Shelby, Monroe, Ottawa, Huron, Lake, Ash- 

 tabula, Auglaize, Cuyahoga, Tuscarawas, Fairfield, Geauga, 

 Clarke, Medina, Licking, Miami, Knox, Fulton, WilHams, Lorain, 

 Summit, Brown. 



3. Rosa virginiana Mill. Virginia Rose. Stems >^-6 ft. 

 high, densely set with long, straight prickles; leaflets 5-7, small, 

 obovate, sharply serrate; flowers pink. General. 



4. Rosa rubiginosa L. Sweetbrier (Rose). Stems 3-Q}4 ft. 

 high, with stout, recurved prickles; leaflets 5-7, ovate or oval, 

 doubly serrate, very glandular beneath; frtiit oval, glandular. 

 Ottawa, Lorain, Highland, Ashtabula, Madison, Hancock, Brown, 

 Preble, Jefferson, Morrow, Monroe, Morgan, Licking, Miami, 

 Greene, Wayne, Ross, Montgomery, WilHams, Warren, Coshoc- 

 ton, Noble, Guernsey, Knox. 



