ROSACEAE 5J7 



sparingly branched, closely armed with straight prickles : leaves 4-11 cm. long ; stipules 

 relatively broad ; leaflets 5-9, the blades oval or oval-lanceolate, 3-5 cm. long, obtuse, 

 sharply and doubly serrate, very thin, pale beneath, more or less copiously resinous-pubes- 

 cent : flowers normally solitary : sepals lanceolate, acuminate or somewhat dilated above, 

 entire or with few teeth : corolla 6-7 cm. broad : fruit about 2 cm. long, elongated, with 

 a conic base and manifest neck. 



In open woods, Michigan to South Dakota, Texas and Colorado. Summer. 



4. Rosa Arkansana Porter. A branching shrub 3-6 dm. tall. Stems and branches 

 more or less densely armed with bristle-like prickles : leaves 5-10 cm. long, often numer- 

 ous ; stipules rather narrow ; leaflets 7-11, the blades oval, obovate or cuneate, 1-2.5 cm. 

 long, rounded at the apex, simply serrate, sometimes tomentose beneath : flowers in ter- 

 minal corymbs, rarely solitary : hypanthium glaucous : sepals lanceolate, acuminate, glan- 

 dular without, tomentose within, spreading or reflexed at maturity, persistent : corolla 4-5 

 cm. broad : styles distinct : fruit subglobose, red, 10-12 mm. long, glabrous. 



On prairies, Minnesota to Colorado, Missouri, Texas and New Mexico. Spring and summer. 



5. Rosa Woodsii Lindl. A bushy shrub 3-10 dm. tall. Stems with slender, mostly 

 straight, prickles, or unarmed above : leaves 3-10 cm. long ; stipules entire, rather broad ; 

 leaflets 5-9, the blades oval or obovate, 1-2 cm. long, rather obtuse, simply serrate, cuneate 

 or narrowed at the l»ase, somewhat glabrous beneath : sepals erect at maturity: corolla 3-5 

 cm. broad : fruit globose or ovoid-globose, 8-10 mm. high, glabrous and sometimes glaucous. 



On prairies, Minnesota to the Northwest Territory, Missouri, Texas and New Mexico. Summer. 



6. Rosa lancif olia Small. A branching shrub 1-2 m. tall. Stems and branches 

 terete, armed with short, stout, straight prickles : leaves 5-8 cm. long ; leaflets 3-7, the 

 blades leathery, lanceolate or oblong-lanceolate, 2-6 cm. long, acute or slightly acuminate, 

 finely serrate, glabrous, somewhat lustrous above, the lateral ones sessile : flowers clustered : 

 hypanthium somewhat glandular-pubescent : sepals narrowly linear-lanceolate, slightly 

 dilated at the apex, often with 1 or 2 lateral teeth : fruit somewhat depressed. 



About cypress swamps, central peninsular Florida. Spring and summer. 



7. Rosa Carolina L. A bushy shrub 1-3 m. tall. Stems and branches armed with 

 rather stout recurved prickles : leaves 6-14 cm. long ; leaflets 5-9, commonly 7, the blades 

 membranous, ellii^tic to elliptic-obovate or oblanceolate, 2.5-7 cm. long, acute or obtuse at 

 the apex, finely serrate, glabrous or pubescent beneath : flowers in terminal corymbs, or 

 rarely solitary : hypanthium glandular : sepals lanceolate or linear-lanceolate, acuminate, 

 often dilated at the apex, rarely lobed, spreading or reflexed at maturity, deciduous : style 

 distinct : fruit subglobose or depressed, 7-9 mm. in diameter, red, more or less glandular. 



In swamps and low situations, Quebec to Minnesota, Florida and Mississippi. Spring and summer. 



8. Rosa foliosa Nutt. A branching shrub, about 1 m. tall. Stems and branches 

 armed with straiglit or slightly curved prickles : leaves 3-7 cm. long ; leaflets 7-11, the 

 blades firm, usually acute, serrate, glabrous or nearly so: flowers solitary, or a few in cor- 

 ymbs : hypanthium hispid : sepals lanceolate, acuminate, glandular-pubescent, often lobed, 

 spreading at maturity, deciduous : corolla 3-4 cm. broad : styles distinct : fruit subglobose, 

 8-10 mm. in diameter, red, glabrous or nearly so. 



On plains or prairies, Arkansas and the Indian Territory to Texas. Spring and summer. 



9. Rosa hiimilis Marsh. A bushy shrub 2-24 dm. tall. Stems and branches armed 

 with straight prickles : leaves 5-15 cm. long ; leaflets 5-7, usually 5, the blades rather 

 leathery, elliptic, oval or ovate-lanceolate, or sometimes cuneate, 1.5-5 cm. long, acute or 

 rarely rounded at the apex, serrate, sometimes pubescent beneath : flowers solitary, or few 

 in corymbs : hypanthium more or less densely glandular-pubescent : sepals lanceolate, 

 acuminate, dilated or lobed above, spreading deciduous : corolla 4-6 cm. broad : styles 

 distinct : fruit subglobose or depressed, 12-15 mm. in diameter, red. 



In dry soil, Ontario to Wisconsin, Georgia and Louisiana. Spring and summer. 



10. Rosa rubiginosa L. A straggling aromatic shrub. Stems and branches often 



wand-like, 1-3 m. long, armed with recurved prickles : leaves 2-8 cm. long ; leaflets 5-7, 



the blades elliptic, oval or suborbicular, sometimes varying to ovate or obovate, 1.5-3 cm. 



long, acute or obtuse at botli ends, sharply serrate, resinous beneath : flowers solitary, or few 



in corymbs : hypanthium glabrous or bristly : sepals lanceolate, with an acuminate pinnatifid 



apex : corolla white or pink : styles distinct : fruit oval to narrowly ovoid, 1-2 cm. long, 



deep red, shining. 



In waste places, Nova Scotia and Ontario, Georgia and Tennessee. Spring and summer. Natural- 

 ized from Europe. Swketbrier. 



11. Rosa canina L. A straggling shrub. Stems and branches 1-3 m. long, armed 

 with slightly curved prickles : leaves 5-8 cm. long ; leaflets 5-7, the blades usually ovate 

 or oval, 1-3 cm. long, often obtuse at both ends, sometimes acuminate at the apex, serrate, 

 glabrous or slightly pubescent beneath : flowers solitary, or a very few in corymbs : sepals 

 lanceolate or oblong-lanceolate, acuminate, lobed near the apex, reflexed at maturity, 



