ROSACEAE 117 



in old sand regions in Kankakee County, and in Pulaski County 

 & in the extreme southern part of the state. 



I Additional Bramble Species. — Besides the above important 

 Her relatively abundant species, others have been recorded occa- 

 Fsionally. One, Rubus pubescens Rafinesque, is herbaceous and 



■ is sometimes called the Dwarf Raspberry. It bears globose, 



■ edible, dark red fruit and is a low, unarmed perennial some- 

 times slightly woody at the base. It has been extensively col- 

 lected in a few northeastern counties, the only part of the state 

 in which it is known to occur. Rare collections of southern 

 species have been recorded from the southern part of Illinois. 

 Among these are R. betulifoUus Small, R. pergratiis Blanchard.' 

 R. recurvans Blanchard and R. rubrisetiis Rydberg. The bram- 

 bles of the state have not been completely studied, and both 



I occurrence and distribution remain to be demonstrated for these 

 and other species. 



I ROSA (Tournefort) Linnaeus 



The Roses 



The roses are a group of erect or widely spreading shrubs 

 with stems generally armed with prickles, alternate, compound, 

 odd-pinnate leaves, and stipules adnate to the petioles. Flowers 

 have 5 sepals, which are united at the base and more or less 

 foliaceous, 5 showy petals, and many stamens. The several to 

 numerous pistils develop bony seeds or achenes inside of small, 

 apple-like fruits called hips, which are the fleshy receptacles of 

 the flowers. 



The rose genus is represented by great numbers of species 

 widely distributed over the northern hemisphere, and the 

 popularity of the flower has led to its cultivation in an ever- 

 increasing number of varieties. Distinctions between even wild 

 species are not easily made, and there is perhaps as much dis- 

 agreement among authorities concerning the rose species as 

 there is concerning Rubus species. 



Key to the Rose Species 



Old stems trailing or climbing; leaves on old stems mostly 3- 



foliate, on new growth 3- or 5-foliate R. setigera, p. IIS 



Old stems essentially erect; leaves on old and new stems 5- to 

 9-foliate. 

 Calvx lobes reflexed after flowering, and deciduous. 



