11 O S 



^ 53. RHUS, 43. 94, 



typhinum (sumach, y-g. Ju. h ) branches and petioles 

 'very villose. glabrum (sleek sumach.) g. r. Ju. I? .) 

 b ranches, petioles and leaves glabrous. copnUinum (wing- 

 rib sumach, mountain sumach.; vcrnix( poison sumach.) 

 cotinus (Aaron's beard, false fringe tree. E. g-y. J. ^ .) 

 toxicodendron (poison vine, poison ash.) Var. rndicans 

 (poison ivy.) Var. qitercifobum (poison oak.) Var. mi- 

 erocarpon. aroinaticum. 



31. RHYNCHOSPORA, 3. 9. 

 sparsa (false bog-rush.) glomerata. alba* ciliata. 



51. RIBES, 36. 85. 

 1. Currant-like. Flowers racemed. 



rubrum (currant. E. g. M. ^ ) unarmed : racemes 

 glabrous, nodding : corol flat ; petals obcordate. ni- 

 grum (black currant.) albinervium. trijidum. ringens. 

 glandulosum. recurvatum. Jioridum (wild black-cur- 

 rant. 



S. Gooseberry -like. Peduncles mostly fetv-f lowered ; rare- 

 ly subracemed. 



grossularia (englisli gooscbei-i-y. ) trifloritm (wild goose- 

 berry.) hirlellum. oxyacaulhdides. gracile. lacustris. 

 conabasti. 



223, RICCIA, 57. 3. 



natans (floating liverwort.) fluitans (forkstems,) 

 glauca. 



2016. RICINUS, 38. 96. 



communis (caster-oil plant, pahna christi. E. OO leaves' 

 jpeltate, palmate. 



41. RIVINA, 12. 29. 



laems (rough-seed.) 



1710. ROBINIA, 32. 93. 



pseudo-acacia (locust tree, false acacia, w. M. h ) leaves 

 pinnate, with a terminal leat'et. -viscosa( clammy locust.) 

 iiispida (rose locust.) caragana (Siberian locust.) 



1213. ROSA, 35. 92. 

 corymbosa (swamp rose.) parviflora (wild rose. r. w. 



