176 MASS. EXPERIMENT STATION BULLETIN 267 



Rhus toxicodendron. Poison Ivy. A nati\e sliruhhy vine everywhere abun- 

 dant and everywhere beautiful in s]>ite of its bad social habits. The only 

 effective method of eradication is l)y ii})rootino:. This is an endless job 

 since birds scatter the seeds over wide areas and seedling i)lants are abun- 

 dant everywhere. 



Rhus ti/phino. Stagiiohn Suimac. A large, coarse, very common native 

 species used in park work and broad naturalistic plantings; good autumn 

 colors. Fairly easy to trans})lant; suckers considerably. 



Rhus tjiphhui Inclnlata, Shredded Su.-mac. A variety of the above with very 

 much dissected foliage; interesting as a curiosity l)ut of little value other- 

 wise. 



Rhus verniciffua. LAcciUEii-TitEE. A small tree from Japan and Cliina, showy 

 in foliage. This species was grown for several years on the campus but 

 had to be suppressed because it proved unusually poisonous — much more 

 aggressive in tliis respect than tlie well-known i)()is()n ivy. (Otherwise it is 

 desirable. 



Rhus vfnii.v. Poison Su.'mac. Nati\e shrub growing in swam])s, beautiful 

 but very ])oison()us, colors finely in autumn, white or light buff berries. 



Rilies odorntum, Golden Cuurant. An attractive little shrub with fra- 

 grant yellow flowers, now generally interdicted as an intermediate host in the 

 v.hite pine blister-rust. 



Roiniiia pseudoacacia, Co."m.-mon LocrsT. This rather weedy tree has some 

 value for general j)ark ])lanting, moi-e especially on waste land. It is per- 

 fectly hardy here but does not show with such comjiarative favor as in some 

 of the sandier seacoast towns. Suckers badly. 



Robinin viscosa, Clamjiy Locust. A large shrub with attractive jiink 

 flowers. Has minor value for mass planting. "S'ery susceptible to injury by 

 locust-twig borer. Like the conunon locust it suckers very freely. 



Rosa hlfindfi, Meadow Rose. An attractive native rose suitable for wild 

 garden use, preferably in moist, somew iiat simny meadow locations. S])reads 

 freely by root suckers. 



Rose hybrid, F. J. Grootendorst. This rose has been tried as a hedge 

 plant. A])])arently it can be used for tiiis ])urpose exactly as Rosa rugosa, 

 one of its parents, is frequently used; that is, to make a hedge border to 

 be left imsheared. It is more floriferous and has a much longer flowering 

 season than R. rugosa and is to be preferred on this account. 



Rosa mulfi/Jora, Japanese Rose. A strong, lusty-growing jilant, rather 

 coarse. Flowers abundant, in large clusters, usually with a rather unpleas- 

 ant odor. This is, however, a strikingly satisfactory shrub for many sorts of 

 ])lantings, both because the ])lant is strong and hardy and because it is dis- 

 tinctly floriferous. The bright hi])s lasting far into the winter are also orna- 

 mental and may ])ossibly be attracti\e to birds. 



Rosa palustris. Swa:\ii> Rose. A iiati\c s])ecies, usually of low growth, best 

 ada])te(l \i) wet soil in large plantations. 



Rosa rugosa, RiuiosA Rose. 'J'his hardy and ))0])ular Ja])anese rose has 

 been extensively used on the college camj)us. It has substantial value in 

 general plantings but appears to special advantage on exposed .seashore loca- 

 tions. The white-flowering variety is quite attractive; and several of the 

 hybrids are distinctly promising. 



