_ Sepals, 266 
epigynous, 269 
hypogynous, 269 
perigynous, 269 
Sequoia, 465 
height of, 186 
Serenoa serrulata, 487 
Serpentaria, 512 
Serpyllum, 596 
Service Berry, 535 
Sesame Family, 601 
Sesamum indicum, 602 
Sesuvium maritimum, 514 
Shad Bush, 535 
Shell bark, 130 
Shepherd’s Purse, 302 
Shoots, 180, 247 
fertile, 437 
spur, 446 
sterile, 437 
Shrub, 191, 582 
Sideritis, 596 
Sieve, 133 
callus of plates, 109 
plates, 133 
Sieve tubes, 133, 134 
stages in development of, 134 
Silica, 91 
bodies, 91 
Siliceous Earths, 350 
Silicule, 302 
Siliqua, 302 
Silphium, 615 
Simaruba, 547 
Simaruba amara, 547 
officinalis, 547 
Simarubacea, 546 
Sinapis alba, 530 
Sinapis Nigra U.S.P., 530 
Sinigrin, 103 
Siphon Algz, 346 
Siphonales, 346, 376 
Siphonostele, 145, 199 
Sitotaxy, 34 
Sitotropism, 34 
Skunk Cabbage, 487 
Slime Molds, 362, 374 
Fig. of, 353 
Response to water, 34 
INDEX 785 
Slime plugs, 134 
Slippery Elm, leaf of, 221, 241 
Smilax, 490 
histology of root, 165, 166 
medica, 490 
modified stipules of, 246 
officinalis, 489, 490 
ornata, 490 
Smuts, 397 
Snapdragon, 272, 600 
stamens of, 275 
Snowberry, 606 
Soap Bark, 84 
Soapwort Family, 553 
Soft bast, 202 
Saja max, 540 
Solanaceae, 596 
development of stomata in, 254 
placentation in, 288 
Solanee, anther dehiscence in, 279 
Solanine, 87 
Solanum, 598 
Solanum, 596 
Solanum carolinense, 87, 598 
Dulcamara, 87, 596, 598, 599 
nigrum, 87 
tuberosum, 87, 203 
Solidago odora, 615 
Solomon’s Seal, 192 
Sorbinose, 74 
Sorbus, 535 
Soredia, 416 
Sorghum, 484 
Sorosis, defined, 307 
Sorus, 433 
Sour Gum, 575, 577 
Soy Bean, 540 
Spadix, 259 
Sparganium, 618 
Spathe, 259 
Spearmint, 595 
Species, defined, 326 
Species Plantarum, 325 
Specific epithet, 330 
Specific name, 329 
Spermacia, 401 
Spermagonia, 401 
Spermatium, 358 
Spermatocyte, 68 
