118 American Midland Naturalist Monograph No. 7 



1 1. Inflorescence short-corymbiform, conspicuous- 

 ly leafy-bracted throughout; primocanes 

 nearly terete; thickets. May- June. [R. re- 



curvans Blanch. ; R. jrondosus Bigel.] 



R. pennsylvanicus Poir. 



8. Sterns setose or hispid, not or only weakly prickly, some- 

 times nearly unarmed; swales, rare, Kankakee Co., 

 R. A. Schneider. [R. offectus Bailey; R. schneideri 



Bailey] R. setosus Bigel. 



7. Stems trailing or decumbent, slender, only the floral 

 branches erect. (Dewberries.) 



12. Stems retrorsely bristly (or nearly unarmed), not prick- 

 ly; leaflets firm, oblanceolate, glabrous on both sides, 

 glossy above, paler and dull beneath; petals 5-8 mm 

 long; meadows or low woods, n. 111. June-July. 

 Swamp Dewberry R. hispidus L. 



12. Stems usually with weak curved prickles. 



13. Stems bearing glandular bristles among the prickles; 

 leaves coriaceous, often persistent; dry soil, s. 111. 



Apr. -May. Southern Dewberry 



R. trivialis Michx. 



13. Stems with few, firm, flat-based prickles along the 

 angles; leaves deciduous; fields, roadsides, and 

 woods, common. April-June. Dewberry. [R. vil- 

 losus Ait., non Thunb.; R. procumbens Muhl., 

 nom. nud.; R. canadensis sensu auth., non L.] 

 R. flagellaris Willd. 



12. Rosa L. — Rose 



I. Styles united in a protruding column about as long as the stamens; 

 sepals reflexed, deciduous from the fruit; stems recurving, 

 climbing or trailing; prickles curved. 



2. Leaflets 5-9 (usually 9); flowers numerous, small, white, fra- 

 grant, 1.5-2 cm in diameter, paniculate; sepals ovate, often 

 with narrow appendages; stipules deeply fringed or pectinate; 

 iruits 5-8 mm in diameter; often planted and more or less 

 persi.stent; native of Japan. May-June. Japanese Rose 

 R. mult i flora Thunb. 



2. Leaflets 3 (or 5) ; stipules entire or denticulate; flowers 3-8 cm 



in diameter; borders of woods, moist thickets, pastures, and 

 hedgerows, common throughout 111. June-July. Climbing 

 Rose. Var. tomentosa T. & G. {R. rubifolia R.Br.) has the 



leaflets pubescent beneath R. setigera Michx. 



1. Styles distinct, not exserted; leaflets 5-11; stems erect or arching. 



3. Achenes lining the inner wall as well as the base of the 



receptacle. 



4. Stems with bristles and slender prickles; leaflets usually 3 or 



