A Abies, 24 lasiocarpa, 27 Aceraceæ, 185 Acer glabrum, 185 Achillea, 285 lanulosa, 314 Actæa, 91 arguta, 108 eburnea, 109 Adder’s-Tongue Family, 1 Adiantum, 3 pedatum, 6 Agoseris, 276 aurantiaca, 277 glauca, 276 graciliens, 277 Large-flowered, 276 Orange-flowered, 277 Slender, 277 Alder, Slender-leaved, 72 Alexanders, Heart-leaved, 203 Allium, 42 recurvatum, 42 sibericum, 43 Alnus tenuifolia, 72 Alsine, 82 borealis, 86 læta, 86 longipes, 85 Alum-root, Smooth, 134 Round-leaved, 135 Amelanchier alnifolia, 166 Anaphalis, 285 subalpina, 320 Androsace, 226 carinata, 228 diffusa, 229 septentrionalis, 229 Alpine, 229 Spreading, 229 Sweet-flowered, 228 Anemone, 91 Drummondii, 93 globosa, 93 parviflora, 92 Alpine, 93 Northern, 92 Western, 95 Antennaria, 285 Howellii, 318 lanata, 317 parvifolia, 319 pulcherrima, 317 racemosa, 318 rosea, 320 Antiphylla, 130 oppositifolia, 146 APIACEÆ, 201 APOCYNACEÆ, 237 Apocynum, androsæmifolium, 237 Apple Family, 165 Aquilegia, 91 brevistyla, 105 flavescens, 106 formosa, 106 Arabis, 112 Drummondii, 120 hirsuta, 119 Holboldii, 119 Lyallii, 120 ARACEÆ, 35 Aragallus, 168 deflexus, 176 inflatus, 176 Lamberti, 174 monticola, 173 splendens, 175 viscidulus, 175 ARALIACEÆ, 199 Aralia nudicaulis, 199 Arctostaphylos, 212 uva-ursi, 214 Arenaria, 82 capillaris nardifolia, 88 sajanensis, 89 verna equicaulis, 89 Argentina, 151 anserina, 159 Arnica, 285 Chamissonis, 306 cordifolia, 304 eradiata, 308 fulgens, 307 gracilis, 304 latifolia, 305 louiseana, 306 Alpine, 307 Broad-leaved, 305 Chamisso’s, 306 Heart-leaved, 304 Pale-flowered, 306 Rayless, 308 Slender, 304 Artemisia, 285 discolor, 316 frigida, 316 Arum Family, 35 Aruncus, 150 Aruncus, 153 Aspen, American, 69 Asphodel, False, 40 Scottish, 40 Western False, 41 Asplenium, 4 Filix-fœmina, 9 viride, 9 Aster, 285 ciliomarginatus, 298 conspicuus, 296 frondeus, 299 Lindleyanus, 298 major, 297 Richardsonii, 296 Engelmann’s, 300 Great Northern, 297 Hispid Golden, 286 Large Purple, 296 Leafy-bracted, 299 Lindley’s, 298 Richardson’s, 296 Astragalus, 168 adsurgens, 169 alpinus, 170 convallarius, 171 hypoglottis, 169 Macouni, 171 Atragene, 90 columbiana, 91 Avens, Drummond’s Mountain, 164 Large-leaved, 162