John's-wort, 195; Fig. 105.

Stock, 192.

Stoma. See "Breathing-pore."

Stonecrop, 202; Fig. 113.

Stone-fruit, 206.

Stone-wort. See "_Characeae_."

Stony-tissue, 110.

Stramonium, 215.

Strawberry, 171, 202, 206; Fig. 113.

Style, 148, 175, 179.

_Stylophorum_, 187; Fig. 103.

Sugar, 8, 145.

Sulphur, 2.

Sumach, 198; Fig. 108.

Sun-dew, 192, 193; Fig. 104.

Sunflower, 224.

Suspensor, 180.

Sweet-flag, 157.

Sweet-potato, 214.

Sweet-scented shrub. See "_Calycanthus_."

Sweet-william, 185.

Sycamore, 183.

_Sympetalae_, 210.

_Symphoricarpus_. See "Snowberry."

_Symplocarpus_. See "Skunk-cabbage."

Synergidae, 144.

_Syringa_, 199; Fig. 111. See also "Lilac."

Tamarack, 142.

Tap-root, 131, 173.

_Taraxacum_. See "Dandelion."

_Taxodium_. See "Cypress."

_Taxus_. See "Yew."

Teasel, 224; Fig. 124.

_Tecoma_. See "Trumpet-creeper."

Teleuto-spore, 80, 81.

Tendril, 171.

_Terebinthinae_, 198.

Tetraspore, 51, 52.

Thistle, 173, 223; Fig. 125.

Thorn, 172.

Thyme, 215.

_Thymeleaceae_, 206.

_Thymelinae_, 206.

_Tilia_, _-aceae_. See "Linden."

_Tillandsia_, 156; Fig. 84.

Tissue, 8.

Tissue system, 115.

Toadstool, 82.

Tobacco, 215.

_Tolypella_, 40.

Tomato, 215.

Touch-me-not. See "Jewel-weed."

Tracheary tissue, 110, 121, 177.

Tracheid, 110, 138.

_Tradescantia_. See "Spiderwort."

Trailing arbutus, 211.

_Tremella_, 81; Fig. 51.

_Trichia_, 13, 14; Fig. 5.

Trichogyne, 51.

_Tricoccae_, 199.

_Triglochin_. See "Arrow-grass."

_Trillium_, 146, 154, 155; Fig. 83.

_Triphragmium_, 81.

_Tropaeolum_. See "Nasturtium."

Trumpet-creeper.

Tuber, 120, 153, 172.

_Tubiflorae_, 213.

Tulip, 146.

Tulip-tree, 187; Fig. 100.

Turnip, 192.

Twin-leaf, 187; Fig. 101.

_Typha_, _-aceae_. See "Cat-tail."

_Ulmaceae_. See "Elm."

_Ulva_. See "Sea-lettuce."

_Umbelliferae_. See "Umbel-wort."

Umbel-wort, 202.

_Umbelliflorae_, 202.

_Uredineae_, 77.

_Uromyces_, 81; Fig. 47.

_Urticinae_, 183.

_Usnea_, 75; Fig. 45.

_Ustillagineae_. See "Smut."

_Ustillago_, 65; Fig. 38.

_Utricularia_. See "Bladder-weed."

_Uvularia_. See "Bellwort."

_Vaccinium_. See "Cranberry."

Vacuole, 8.

Valerian, 224; Fig. 124.

_Valeriana_, _-eae_. See "Valerian."

_Vallisneria_. See "Eel-grass."

_Vanilla_, 166.

_Vaucheria_, 34-37; Figs. 21, 22.
structure of plant, 35.
_racemosa_, 35.
non-se