134 ROSE FAMILY 



long; panicles terminal, large, pyramidal, 15-30 cm. long; flowers white, 

 7-8 mm. broad : sorbifolia, with leaves like sorbus. 



Frequently cultivated and occasionally growing wild. Native of 

 northern Asia, extending from the Ural mountains to Japan. 



Rosa Linne 1753 Rose 

 (Rosa, classical L. name for the rose) 



Bushes sometimes with very long canes which take a semi-climbing 

 or vine-like habit; stems usually armed with prickles, often with a pair 

 of unusually large ones just below each node (infrastipular prickles) ; 

 buds scaly; leaves deciduous or in warm climates sometimes evergreen, 

 pinnately compound with 3-11 leaflets (simple in one Asiatic species), 

 stipules persistent, large, adherent to the petiole with short free auricles 

 at the top; flowers perfect, receptacle deeply cup-shaped, sepals 5, petals 5, 

 stamens many, pistils many, the ovaries free, becoming achenes in fruit, 

 the styles sometimes united, sepals, petals and stamens borne on the upper 

 edge of the receptacle cup, ovaries borne on its inner surface completely 

 concealed by the cup, fruit a "hip" formed by the fleshy receptacle con- 

 taining the numerous bony achenes ; seed solitary, with endosperm. 



A very large genus of the northern hemisphere. The limits of the 

 species are exceedingly difficult to define owing to the variability of the 

 species themselves, and the hybridizing of different species whenever they 

 occur together. These two characteristics of rose species have served as 

 a foundation for the great and ever increasing number of cultivated forms 

 of roses. Our native roses need much further study especially in the 

 living state. In collecting roses for study it is well to have all parts 

 of the plant, flowering branches, fruit, and young non-flowering shoots. 

 Roses which have been cut down at or before the usual flowering time 

 often flower late in the season on new rapidly grown shoots, which differ 

 greatly in appearance from the normal type of the species. 



Key to the Species 



1. Vines; styles united to form an exserted 

 column ; flowers white, pink, or red ; culti- 

 vated 



a. Stipules nearly entire; leaves with 3-5 leaflets R. setigcra 



b. Stipules fringed; leaves with about 9 leaflets R. multiflora 



