150 
Sedum divergens 116 
spathulifoliuim 92, 116 
stenopetaluin 116 
Selaginella detisa 70 
rupestris 85, 103 
struthioloides 85 
Senecio canus 77 
pauciflorus 131 
Riddellii 52 
triangularis 131 
vulgaris 131 
Sericocarpus rigidus loo 
Shepherdia canadensis 122 
Sidalcea Hendersoni 121 
Silene anglica 113 
noctiflora 113 
Sisyinbrium altissimum 58, 116 
officinale 116 
Sophia 116 
Sisyrinchium septentrionale 47 
Sitanion Hystrix 34 
Sium cicutaefolium 123 
Solanum Dulcamara 128 
interior 50 
nigrum 128 
Solidago concinna 76 
elongata 38, 130 
mollis 52 
nana 38 
Pitcheri 52 
trinervata 52 
Sonchus asper 130 
Sophia pinnata 72 
Sorbus sitchensis 94 
Sorghastrum nutans 46 
Sparganium simplex 1o5 
Spergula arvensis 57, 90, 114 
Muhlenbergia, Volume g 
Sphaerostigma deserti 68 
Spiraea densiflora 118 
Douglasii 93, 118 
Sporobclus brevifolius 34, 46 
cryptandrus 35 
Stachys ciliata 126 
Streptopus amplexifolius 11lo 
Struthiopteris spicant 85, 103 
Subularia aquatica 116 
Suida stolonifera 49 
Symphoricarpos racemosus 128 
Syrmatium Bioletti 67 
Davidsonii 67 
eriophorus 67 
Fremontii 67 
Haydoni 67 
nanum 67 
Tanacetum huronense loo, 131 
Taraxacum erythrospermum 52 
Taraxacum 129 
Taxus brevifolia 104 
Thalictrum occidentale 91 
Thelypodium lasiophyllum 116 
Thermopsis montana 37 
Thuja plicata 104 
Tiarella trifoliata 92 
unifoliata 117 
Tissa macrotheca 114 
marina 89, 114 
rubra 114 
Tithymalus mancus 67 
Tofieldia intermedia 1o9 
Townsendia grandiflora 52 
Tragopogon pratensis 39 
Trientalis arctica 97, 125 
latifolia 97, 125 
Triglochin maritima 86 
