Prunus demissa, 167 Pseudotsuga, 24 mucronata, 28 Pteridium, 3 aquilinum pubescens, 6 Puccoon, Narrow-leaved, 243 Pulsatilla, 91 hirsutissima, 94 occidentalis, 95 Purslane Family, 80 Pyrola, 207 asarifolia, 208 chlorantha, 207 minor, 209 secunda, 209 uliginosa, 208 PYROLACEÆ, 207 R Ragwort Giant, 311 Western Golden, 308 RANUNCULACEÆ, 90 Ranunculus, 91 alpeophilus, 100 eremogenes, 99 Eschscholtzii, 100 eximeus, 102 inamœnus, 101 montanensis, 103 pedatifidus, 99 Purshii, 98 reptans, 98 saxicola, 101 Suksdorfii, 102 Raspberry Arctic, 154 Creeping, 153 Dwarf, 155 Wild Red, 156 Rattlesnake Plantain, 62 Northern, 63 Razoumofskya americana, 73 Rhododendron, White Mountain, 218 Ribes Howellii, 149 lacustre, 147 oxyacanthoides, 148 setosum, 148 Romanzoffia, 238 sitchensis, 240 Roripa, 112 nasturtium, 124 Rosa, 150 Macounii, 165 ROSACEÆ, 150 Rose Family, 150 Macoun’s, 165 RUBIACEÆ, 263 Rubus, 150 americanus, 155 arcticus, 154 parviflorus, 156 pedatus, 153 strigosus, 156 Rudbeckia, 285 hirta, 301 Rumex, 76 acetosa, 77 salicifolius, 77 Rush, Common Scouring, 16 S Sagina, 82 saginoides, 87 St. John’s-wort Family, 186 Scouler’s, 186 SALICACEÆ, 68 Salmon-berry, 156 Sambucus, 264 melanocarpa, 265 pubens, 264 Sandalwood Family, 73 Sandwort Alpine, 89 Blunt-leaved, 87 Rock, 88 Vernal, 89 SANTALACEÆ, 73 Sarsaparilla, Wild, 199 Saussurea, 285 densa, 322 Saxifraga, 130 cernua, 138 rivularis, 137 SAXIFRAGACEÆ, 128 Saxifrage Alpine, 140 Alpine Brook, 137 Common, 145 Family, 128 Fleshy, 144 Golden, 130 Lyall’s, 141 Nelson’s, 142 Nodding Bulbous, 137 Purple, 146 Tall, 142 Tufted, 139 Scouring Rush, Common, 16 SCROPHULARIACEÆ, 248 Scutellaria, 244 galericulata, 245 Sedum stenopetalum, 125 Selaginella densa, 23 selaginoides, 22 Family, 22 Low, 22 SELAGINELLACEÆ, 22 Self-heal, 245 Senecio, 285 canus, 310 discoideus, 309 flavovirens, 309 lugens, 311 pseudaureus, 308 triangularis, 311 Shooting-Star, 231 Slender, 230 Sibbaldia, 151 procumbens, 157 Sieversia, 151 ciliata, 163 Silene, 82 acaulis, 82 Lyallii, 83 Silver-Berry, 191 Silver-weed, 159 Sisymbrium, 112 altissimum, 122 Sisyrinchium, septentrionalis, 53 Skullcap, Marsh, 245 Skunk-Cabbage, Western, 36 Smelowskia, 112 calycina, 121 Snowberry, 267