522 
INDEX. 
Page. 
Senecio Andinus, Nutt 1S9 
aureus, L 189 
canns, Hook 190 
eremoiiliilus, Eicli 191 
ejcaltdtusi, jSutt 188 
Feudleri, Gray 190, 422 
filifolius, Nutt 191 
Fr6montii, T.&G 192 
hydvophilus, Nutt 189 
multilobatus, T. & G 191 
lugens, Eich 188 
Serra, Hook 189 
triangularis, Hook 189 
Sesuvium Portulacastrum, L 120 
Sc'taria viridis, Beauv 394 
Senhertia, Ktb 490 
crocea, Wood 490 
Shepherdia argentoa, Nutt 318 
Caundcnsia, Nutt 318 
Sibhaldia prociimhens, L 89 
Sida liedoracea, Torr 48 
malv(rJiora, DC 46 
Sidalcea, Gray 46 
fail dida, Gray 46 
uialvieflora, Gray 46 
Silene, L 430 
acaulis, L 36,432 
autirrliiua, L. 36,432 
Bakhvinii, Nutt 431 
Bolaudori, Gray 431 
Bridgesii, Eolir 432 
Californica, Dur 431 
Douglasii, Hook 36,431 
Drummondii, Hook , 37,432 
Engelmanni, Eolir 432 
Greggii, Gray 431 
Hookeri, Nutt 431 
jnconipta, Gray 432 
laciuiuta, Car 431 
Meuziesii, Hook 36,432 
nivea, DC 431 
ovata, Pursli 432 
Pennsylvauica, Mx 431 
rcgia, Sims 431 
rotuiidifolia, Nutt 431 
Scouleri, Hook 432 
stellata, Ait 432 
Wriglitii, Gray 431 
Sn^KNEJE 430 
Simsia, Pers 423 
canesceus, Gray 423 
Siiiajm, L 28 
SiiiDiion djjmoidcfi, Eaf. 391 
Sisymbrium Californicum, S. Watson 23 
canescens, Nutt 23 
junceum, Bieb 23 
reflexum, Kell 18 
Sisyrinchium Bermudiana, L 342 
grandifioniin, Dougl 342 
Siiim aiignstifolium, L 121 
Page. 
Sium linearc, Mx 121 
Smelowskia, Meyer 24 
Californica, Gray 23 
calyeina, Mey 24 
Smilaciua anqilcxicauUs, Nutt 345 
racemosa, Desf. 345 
stellata, Desf. 345 
SOLAXACE^ 274 
Solauum nigrum, L 274 
umbelliferum, Esch 274 
Solidago elougata, Nutt 155 
gigantea, Ait 156 
Guiradonis, Gray 154 
lanceolata, L 156 
nana, Nutt 155 
nemoralis, Ait 155 
occidentalis, T. & G 156 
pumila, T. & G 155 
Eadula, Nutt 155 
speciosa, Nutt - 155 
stricta, Ait 154 
Yirga-aurea, L 154 
Sonclius aaper, Vill 208 
Sparganium eurycarpum, Eng 337 
minimum, Bauli 337 
Spartina gracilis, Trin 381 
Specularia pcrfoliata, DC 209 
Spergnlaria media, Prcsl 42 
SphaiwHciadiitm capitellatum, Gray 126 
Spha ralcea, St. Hill 48 
acerifolia, Nutt 48 
angustifolia, Spach 48, 417 
Emoryi, Torr 48 
Fendleri, Gray 48,417 
incana, Torr 47, 48, 417 
Lindbeiineri, Gray 48 
JV)-if/htii, Gray 48 
Spiraea ariaifolia, Sm 81 
ca}spitosa, Nutt 81 
dumosa, Nutt 80 
opalifolia^ L 80 
Spirantbes Eomanzoffiaua, Cham 341 
Sj>orol}olus airoides, Torr 375 
asjycrif alius, Tluirb 375 
cryptandrus, Gray 375 
ramulostis, Kth 376 
Spraguea, Torr 44 
paniculata, Kell 44 
umbellata, Torr 44 
Stacbys palustris, L 237 
Stanleya, Nutt 24 
fruticom, Nutt 24 
hcterophj/Jla, Nutt 24 
intef/rifolia, J iiiuca 24 
pinLuitifida, Nutt 24 
viridiflora, Nutt 25 
Stellaria borealis. Big 38, .39 
crassifolia, Ebrb 38, 417 
gracUi.s, Kicb 39 
Jamesii, Torr 38 
