Secale, 459 Sedges, 457 Seed-leaves, 233 Segments of the perianth, 8 Sempervivum, 365 Senna, 35, 46 Sensitive Plant, 35, 40, 44 Sepals, 7 Seville Orange, 308 Shaddock, 307 Shepherd’s Club, 154 Shield Fern, 462 Shrubby Trefoil, 341 Sideroxylon, 399 Side-saddle Plant, 259 Sieversia, 58 Silene, 292 Silk Cotton Tree, 299 Sillicle (_fig._ 114), 267 Sillique (_fig._ 115), 267 Silver Fir, 206, 214 Simarubaceæ, 342 Sinningia, 395 Siphocampylos, 392 Siphonia, 430 Sisyrinchium, 443 Sloe (_fig._ 25), 62 Smilax, 448 Snake Gourd, 361 Snapdragon, 411 Snowberry, 384 Snowdrop, 446 Snowdrop Tree, 398 Soap Tree, 327 Soapwort, 292 Soda, 422 Solandra, 153 Solanum, 142 Soldanella, 418 Sollya, 288 Sophora, 40 Sorbus, 68 Sorrel, 423 Sorus, 461 Sour Sop, 246 Southern-wood, or Old-man, 107 Sow-bread, 417 Sowthistle (_fig._ 43), 101 Spanish Broom, 40 Sparaxis, 443 Spearwort, 14 Spiderwort, 452 Spleenwort, 462 Spinach, 422 Spindle Tree, 343 Spiræa (_fig._ 24), 59 Spiral vessels, 232, 336 Sporules, 461 Spruce Fir, 206, 212 Spurge Laurel, 426 Squills, 449 Squirting Cucumber, 361 Stackhousia, 431 Staff Tree, 343 St. Dabeoc’s Heath, 117 St. John’s Bread, 46 St. John’s Wort, 312 Stamens (_fig._ 1), 5 Standard, 37 Stapelia, 403 Stapylæa, 343 Star of Bethlehem, 449 Statice, 418 Sterculia, 300 Stigma, 5 Sting of the Nettle, 159 Stipes, 470 Stipules (_fig._ 20), 53 Stocks, 270 Stone Pine, 211 Stonewort, 465 Storax, 398 Stratiotes, 436 Strawberry, 55 Strawberry Blite, 422 Strawberry Tree, 118 Strelitzia, 443 Streptocarpus, 412 Strobile, 210 Strychnos, 401 Stuartia, 303 Stump of the Silver Fir, 215 Stump Tree, 48 Style, 5 Stylideæ, 393 Styrax, 398 Succory, 101 Sugar Cane, 458 Sugar Maple, 320 Sun-dew Tribe, 284 Sun Flower, 107 Sun Rose, 279 Suwarrow Nut, 327 Sweet Bay Tree, 424 Sweet Briar, 53 Sweet Gale, 203 Sweet Pea (_fig._ 13), 36 Sweet William, 292 Swietenia, 329 Sycamore (_figs._ 123 & 124), 315 Sycamore Tree of Holy Writ, 172 Symplocos, 397 Symphoria, 384 Syringa, 358 T. Tacamahac Tree, 187 Talauma, 245 Talinum, 364 Tamarind, 35, 46 Tamarisk, 357 Tamus, 448 Tanghina, 402 Tapioca, 431 Tap-root (_fig._ 11), 30 Tar, 209 Taxodium, 224 Taxus, 228 Teak, 415 Teasel, 389 Tea Tree, 306 Tecoma, 404 Tectona, 415 Tendrils, 24 Terebinthaceæ, 347 Ternate leaves, 55 Ternstrœmiaceæ, 303 Testudinaria, 447 Thalia, 442 Thallus, 468 Thalamifloræ, 237 Thalamus, 5 Theca, 461 Thea Bohea, 307 Theobroma, 300 Theophrasta, 399 Thistle Down, 104 Thomasia, 300 Thorn Apple, 153 Thorny Acacia, 47 Thread, 495 Thrift, 418 Thunbergia, 416 Thyme, 412