FLOWERING PLANTS. 21 



RHUS, L. sumach. 



typhina, L. stag's-horn sumach. 



glabra, L. smooth sumach. 



copallina, L. wing rib. 



vernix, X. poison sumach. 



toxicodendron, L. poison vine. 

 RIBES L. currant ; gooseberry. 



cynosbati, L. prickly gooseberry. 

 ROBINIA, L. locust-tree. 



pseudacacia, L. common locust. 

 ROSA, Tourn. rose. 



rubiginosa, L. sweet-briar. 



setigera, Michx. climbing prairie rose. 



Carolina, L. swamp rose. 

 RUBUS, L. bramble ; raspberry. 



occidentalis, L. black raspberry. 



canadensis, L. dewberry. 



villosus, Ait. common blackberry. 

 RUDBECKIA, L. coneflower. 



fulgida, Ait. 



hirta, L. rough coneflower. 



triloba, L. 



laciniata, L. tall coneflower. 

 RUMEX, L. dock sorrel. 



acetosella, L. sheep sorrel. 



s. 



SABBATIA, Adans. American centuary. 



angularis, Pursh. 

 SAGITTARIA, L. arrowhead. 



variabilis, Englm. 

 SAMBUCUS, Tourn. elder. 



canadensis, L. common elder. 

 SAMOLUS, L. brookweed ; water pimpernel. 



floribundus, Kunih. 

 SANICULA, Tourn. sanicle. 



marilandica, L. 

 SANGUINARIA, Dill, bloodroot. 



canadensis, L. 

 SAPONARIA, L. soapwort. 



officinalis, L. common soapwort ; bouncing bet. 

 SASSAFRAS, Nees. sassafras-tree. 



officinale, Nees. 

 SAURURUS, L. lizard's-tail. 



cernuus, L. 



