782 
Root, functions, 6, 152 
fusiform, 161 
generative tissues of, 158 
growing point of, 158 
hairs, 152, 154 
histology, 163-176 
lateral, 160 
main, 160 
moniliform, 162 
napiform, 162 — 
Phaseolus, 167 
primary, 142, 160, 319 
regions of, 158 
secondary, 160, 177, 319 
Smilax, 165 
soil and water relation of, 152 
systems, 164, 177 
tap, 160 
texture, 162 
tortuous, 162 
tubercles, 176 
Rootlet, 152 
Roots, 160 
abnormal structure in, 175 
brace, 161 
Dicotyledon, 167 
fascicled, 162 
fleshy, 162 
Monocotyledon, 165 
multiple, 162 
napiform, 162 
nodose, 162 
nodule producing, 176 
of parasitic plants, 161 
of primary growth, 167 
of secondary growth, 169 
prop, 161, 319 
secondary, 160 
tuberous, 162 
woody, 162 
Roridula, 530 
Rosa, 535 
Rosa canina, 536 
centifolia, 536 
damascena, 535 
gallica, 535 
Rosacea, 245, 534 
Rosales, 531 
INDEX 
Rose, 535 
Family, 534 
fruit of, 304 
Rosemary, corolla of, 272 
Rose of Sharon, 560 
Rosette aggregates, 89, 90 
Rosin, 465 
Rosmarinus officinalis, 595, 596 
Rotation, crop, 179 
Rubus Idzus, 535 
Rubus Idaeus, 535 
strigosus, 536 
Rue, 286, 545, 646 
Rue Family, 545 
Ruellia, 602, 603 
Ruellia ciliosa, 603 
Rumex, 612, 613 
acetosella, 512 
crispus, 513 
obtusifolius, 513 
pollen of, 283 
Runner, defined, 189 
Ruppia, 291 
Ruscus, 188 
Russian Thistle, pollen of, 283 
Rust, 399 
Cedar, 402 
Hollyhock, 401 
Wheat, 399 
White Pine Blister, 401 
Ruta, 545 
Ruta graveolens, 646, 546 
Rutacea, 545 
Rutea, 545 
Ruthenium Red and Lead Acetate 
Solution, 686 = 
Rye, 259 
starch of, 78, 79 
Sabadilla, 490 
Sabal, 305, 487 
