470 
INDEX 
Rhamnus cathartica, 359 
Frangula, 96, 359 
Purshiana, 359 
Rheum, 322 
officinale, 322 
palmatum, 321, 322 
tanguticum, 322 
Rhinanthus, 392 
Rhizoids, 283, 286, 2Q£> 
Rhizome, defined, 139 
Rhizopora, 410 
Rhizopus, 249 
nigricans, 248 
Rhododendron, 191 
Rhodophyceae, 246 
Rhodymenia palmata, 247 
Rhceadales, 332 
Rhubarb, 322 
Rhus, cotinus, 356 
fruit of, 209 
Glabra N. F., 356 
japonica, 356 
semialata, 356 
toxicodendron, 356 
typhina, 356 
venenata, 356 
Ribes, 336 
Riccia, 283, 409 
Ricciocarpus, 409 
Ricinus communis, 355 
Rocella, 281 
Rock Rose Family, 369 
Root, defined, 121 
adventitious, 123 
anomalous, 123 
California Privet, 12 7-131 
cap, 121, 122 
classification as to form, 123 
conical, 123 
distinction from stem, 123 
duration of, 124 
epiphytic, 123 
functions, 121 
fusiform, 123 
Root, generative tissues of, 122 
hairs, 121, 122 
histology, 124-13 2 
lateral, 123 
primary, 123 
secondary, 123 
system, 133 
tubercles, 13 2-135 
Roots, Dicotyledon, 125 
abnormal structure in, 132 
of parasitic plants, 123 
of primary growth, 125, 126 
of secondary growth, 126, 127 
Monocotyledon, 124 
multiple, 123 
napiform, 123 
nodule producing, 132 
Rootlet, cross section of in region of 
root hairs, 122 
Roridula, 335 
Rosa canina, 341 
centifolia, 341 
gallica, 338 
Rosa Gallica, 338 
Rosaceae, 338 
Rosales, 336 
Rose, 338 
family, 338 
Rosette aggregates, 86, 87 
Rosmarinus officinalis, 397 
Rubber, 94 
Rubi Fructus, 340 
Rubi Idaei Fructus, 340 
Rubiaceae, 398 
Rubiales, 398 
Rubus N. F., 338 
cuneifolius, 338 
Idaeus, 340 
nigrobaccus, 338 
strigosus, 340 
villosus, 338 
Rue Family, 349 
Ruellia ciliosa, 395 
Rumex N. F., 270 
