Creeping, 224 Low, 268 Solidago, 284 canadensis, 288 decumbens, 287 missouriensis, 287 multiradiata, 286 Solomon’s Seal, False, 47 Star-flowered, 47 Sonchus, 276 arvensis, 279 Sophia, 112 intermedia, 123 Sorbus, 165 sambucifolia, 166 Sorrel, Mountain, 76 Spatularia, 130 brunoniana, 142 Spearwort, Creeping, 98 Speedwell Alpine, 253 Thyme-leaved, 253 Spiræa, 150 densiflora, 152 lucida, 152 Beech-leaved, 152 Pink, 152 Spleenwort, Green, 9 Spring Beauty, 80 Small-leaved, 81 Spruce Alberta, 31 Douglas’s, 28 Engelmann’s, 31 Squaw-root, Northern, 309 Stachys, 245 palustris, 246 Staff-tree Family, 184 Star-flower, Arctic, 230 Stenanthella, 37 occidentalis, 39 Stenanthium, 39 Stickseed, 242 Stitchwort Glaucous, 86 Long-stalked, 85 Northern, 86 Stone-crop Family, 125 Narrow petaled, 125 Strawberry, Wild, 158 Streptopus, 46 amplexifolius, 48 curvipes, 49 Sunflower Nuttall’s, 302 Stiff, 301 Symphoricarpos, 264 pauciflorus, 268 racemosus, 267 T Taraxacum, 276 montanum, 278 Taraxacum, 278 TAXACEÆ, 34 Taxus brevifolia, 34 Tellima, 129 grandiflora, 132 Tetragonanthus, 232 deflexus, 235 Thalictrum, 91 megacarpum, 96 occidentalis, 96 Thistle Family, 283 Milk, 279 Wavy-leaved, 321 White, 321 Thlaspi, 112 arvense, 117 Thuja, 24 plicata, 33 Tiarella, 129 unifoliata, 136 Tofieldia, 37 intermedia, 40 occidentalis, 41 palustris, 40 Trientalis, 226 arctica, 230 Trollius, 91 albiflorus, 105 Tsuga, 24 heterophylla, 29 Mertensiana, 30 Twayblade Broad-lipped, 60 Heart-shaped, 60 Northern, 61 Twin-flower, 266 Twisted stalk Smaller, 49 Tall, 48