I

Iberis umbellata = Iberis amara (CANDYTUFT) -- VIII 409

Ictodes foetidus = Symplocarpus foetidus (SKUNK CABBAGE) -- II 158

Ilex spp. (WINTERBERRY) -- see Alder (Red-berried), Prinos, Winterberry

Ilex glabra (INKBERRY) -- see Ink-berry, Prinos (Evergreen), Prinos glabra

Ilex laevigata (SMOOTH WINTERBERRY) -- see Prinos laevigatus, Prinos (Single-berry), Winterberry (Smooth)

Ilex opaca (AMERICAN HOLLY) -- II 348

see also Holly (American)

Ilex verticillata (COMMON WINTERBERRY) -- see Alder (Black), Alder (Speckled Black), Prinos, Prinos (Common), Prinos verticillatus, Winterberry

Ilysanthes = Lindernia spp. (FALSE PIMPERNEL) -- V 315, VI 386, VIII 414

Ilysanthes gratioloides = Lindernia spp. (FALSE PIMPERNEL) -- IV 208

Impatiens = Impatiens capensis (SPOTTED TOUCH-ME-NOT) -- II 389, XII 260, 305

Impatiens capensis (SPOTTED TOUCH-ME-NOT) -- see Impatiens, Impatiens fulva, Noli-me-tangere, Touch-me-not

Impatiens fulva = Impatiens capensis (SPOTTED TOUCH-ME-NOT) -- IV 218

Indian Grass = Sorghastrum nutans (WOOD GRASS) -- XI 147

Indian-pipe = Monotropa uniflora (INDIAN PIPE) -- IV 247, XI 90, 118,

INDIAN PLANTAIN = Cacalia spp.

Indian-tobacco = Lobelia inflata (INDIAN TOBACCO) -- II 409, IV 232

INDIAN TURNIP = Arisaema spp.

Indigo = Baptisia tinctoria (WILD INDIGO) -- IV 183, V 269, 335, VI 375, VII 438, IX 8, XI 76, XIV 211

Indigoweed = Baptisia tinctoria (WILD INDIGO) -- II 65, 70, 123, 227, 286, 299, 300, 396, IV 132, 231, IX 481, XI 205, XII 291, 418, XIII 167, XIV 99, 223

__ (shoot) -- XIII 280

Ink-berry = Ilex glabra (INKBERRY) -- II 366, IV 69

Innocence = Houstonia caerulea (BLUETS) -- IV 71

Intermediate Fern = ¹⁶³ -- XIII 292

Interrupted Fern = Osmunda claytoniana (INTERRUPTED FERN) -- VI 266, (306), 324, VII 5, 338, X (48), 417, 494, XIII (331), 342, 343

__ (fruit) -- XIII 307; __ (pollen) -- VII 388, XII 191; __ (scroll) -- XII 166

Inula = Inula helenium (ELECAMPANE) -- V 355, VIII 450

Inula helenium (ELECAMPANE) -- II 467

see also Elecampane, Inula

Iris = Iris spp. (IRIS) -- IX 407

Iris (Boston) = Iris prismatica (SLENDER BLUE FLAG) -- IV 123

Iris (Common) = Iris versicolor (LARGER BLUE FLAG) -- VI 334, VIII 378, IX 489

Iris prismatica (SLENDER BLUE FLAG) -- IV 123, VIII 118

see also Iris (Small), Iris virginica

Iris (Small) = Iris prismatica (SLENDER BLUE FLAG) -- VI 345, VIII 389

Iris versicolor (LARGER BLUE FLAG) -- II 277, 424, IV 91, 258, VII 413

see also Flag (Blue), Flag (Common Blue), Iris (Common)

Iris virginica = Iris prismatica (SLENDER BLUE FLAG) ¹⁶⁴ -- IV 173, 258, V 238, VI 363

Iron-weed = Vernonia noveboracensis (NEW YORK IRONWEED) -- IV 276

Iron-wood = ¹⁶⁵ -- V 227, 452

Isnardia = Ludwigia palustris (WATER PURSLANE) -- VI 432

Isotria verticillata (WHORLED POGONIA) -- see Arethusa (Whorled), Pogonia verticillata

Iter canadense = ¹⁶⁶ -- III 198

Iva frutescens (MARSH ELDER) -- VII 480

Ivy = Hedera helix (ENGLISH IVY) -- VII 126

Ivy = Rhus radicans (POISON IVY) -- II 217, 434, III 5, 6, IV 91, V 368, 516, VI 390, VII 24, VIII 215

__ (berry) -- V 403, IX 10; __ (leaf) -- II 450, V 117, VII 5; __ (pass) -- V 390; __ (tree) -- V 165, VII 24, 390, 424, VIII 53, 253

Ivy (American) = Parthenocissus quinquefolia (VIRGINIA CREEPER)/Parthenocissus inserta (THICKET CREEPER) ² -- II 501

Ivy (Climbing) = Rhus radicans (POISON IVY) -- VI 303

Ivy (Ground) = Glechoma hederacea (GILL-OVER-THE-GROUND) -- IV 322, VI 259

IVY (POISON) = Rhus radicans

Ivy (Tree-climbing) = Rhus radicans (POISON IVY) -- V 245