Jones: Flora of Illinois, 83. Rosaceae 153 



8. Peduncles and pedicels pubescent and sometimes prickly, but 

 without stalked glands. 

 9. Inflorescence elongate-racemose, leafy-bracted only at the 

 base; young stems (primocanes) angled and grooved; 



thickets. May-June. Tall Blackberry R. argutus Link 



9. Inflorescence short-corymbiform, conspicuously leafy-bracted 

 throughout; primocanes nearly terete; thickets. May-June. 

 [R. recurvans Blanch.} R. frondosus Bigel. 



6. Stems setose or hispid, not or only weakly prickly; sometimes nearly 

 unarmed. 

 10. Leaflets glabrous, or sparsely pubescent on veins on lower sur- 

 face; pedicels smooth or nearly so; sepals glandless; in sandy 

 swales eight miles e. of St. Anne, Kankakee Co., R. A. 



Schneider 1661 (not seen) R. offectus Bailey 



10. Leaflets softly pubescent beneath; pedicels and calyx setulose 

 and glandular; seven miles s.e. of Momence, Kankakee Co., 

 R. A. Schneider 1689 (not seen) R. schneideri Bailey 



5. Stems trailing or decumbent, slender, only the floral branches erect 

 (Dewberries). 



11. Stems retrorsely bristly (or nearly unarmed), not prickly; 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. 



11. Stems usually with weak curved prickles; petals 10-15 mm. long; 

 fields, roadsides and woods, common. Apr.-June. \R. villosus 



Ait., non Thunb.; R. procumbens Muhl., nom. nud.J 



R. flagellaris Willd. 



12. Rosa L. — Rose 



1. The leaflets 3 (or 5), ovate or lanceolate, acute, sharply serrate, glabrous 



above; stems trailing or climbing; flowers corymbose; styles cohering in an 



exserted column; hypanthium globose. 



2. Leaflets glabrous beneath, glossy above; moist thickets and hedgerows. 



June-July. Climbing Rose R. setigera Michx. 



2. Leaflets softly pubescent beneath, dull above; pastures and borders of 



woods, common. June-July. [^R. setigera var. tomentosa T. & G.} 



R. rubifolia R. Br. 



1. The leaflets 5-11; stems erect or arching; styles separate, not exserted or 

 only slightly so. 



3. Leaflets glandular beneath, fragrant, the margins doubly serrate with 



gland-tipped teeth; sepals glandular-setose on the back, more or less 

 lobed, in fruit spreading or reflexed and tardily deciduous; prickles 

 curved, flattened; roadsides and fields, nat. from Eur. May-June. [R. 

 rubiginosa L.} Sweetbriar R. eglanteria L. 



3. Leaflets pubescent or glabrous beneath but not noticeably glandular or 

 fragrant; margins simply serrate. 



