145 



3- Rosa hlanda. Ait. var. Arkausaiia, (Porter). Although 

 frequently observed before, it was first described by Dr. Porter as 

 Rosa Arkansaiia* from specimens collected on the banks of the 



Arkansas River by Mr. Prandagee. The original specimen, in 



flower, is in the herbarium of Lafayette College. Bush apparent- 

 ly low, I to 2 feet high ; stem, foliage and fruiting receptacles 

 glaucous ; flowers corymbose ; sepals entire ; bracts lanceolate > 

 leaflets /to li, mostly 9, oblong- elliptical to oblanceolate, some- 

 what cuneate at base; stipules rather broad ; stem prickly. 



The stipules are as often broad as narrow ; the outer sepals 

 are rarely lobed, probably not much more frequently than in R. 

 blanda, from which it is distinguished by its habit of growth, its 

 glaucousness, by one or two pairs more of leaflets, its prickly 

 stem and by its being more or less glandular. It would there- 

 fore appear that the characters relied upon to differentiate it from 

 the type lack specific distinctness. 



Var. Arkansaiia ranees 



t» 



M 



ward to British America and westward to the Rockies and proba- 

 bly beyond. It undergoes many modifications. On dry prairies it 

 becomes markedly surculose ; its rhizomes are transformed into 

 in-ground stems which give off annual shoots like flowering 

 branches. Since these rhizomes have no leaves, the demand for 

 more foliage is met by an extra pair of leaflets on the suckers. 

 In protected locations, as margins of woods and thickets, it at- 

 tains a height of from three to five feet, with stem either smooth 

 or prickly, and lives for years. It is sometimes found densely 

 resinous. Like R. blanda, rudimentary glands on the sepals and 

 stipules and under surfaces of the leaflets are rarely absent. 

 When its flowers are solitary, as sometimes happens, the low 

 prickly forms bear some resemblance to Rosa acicidaris, from 

 which it is readily distinguished by its glaucous stem and foliage, 

 leaflets more numerous and of another sheipe. 



4. Rosa acicularis, Lindley, 1820, ranges through the north- 

 ern I'ortions of Europe, Asia and North America. In the New 



it extends from Alaska south to about 45° latitude ; from 

 the Pacific eastward to Michigan and James Bay. Its synonyms 

 appear to be R. aciailaris, var. Boiirgcauiana, Crcpin ; A'. Sayi, 



World 



*Synopsis of the Flora of Colorado, 1874. 



