INDEX. 
Page. Page. 
Sensitive brier............cccecececeeeeeenene 330 | Sophora.........00. we eeeceenees ws ec eeececens 339 
Sericotheca..........-.---+---- wee eeeeeeeeeee 310 | Sorbus. . 2.2.2.2... eee eee eee cece cece eee 324 
Service Derry.........-sseeeeececeeeecececeee 322 | Sorghastrum................0.2.- cece ee eeeee 52 
STE) | 485 | Sorghum...........cccececseecececccenesceces 52 
Sesleria... 2.222222... eee eee eee ee eee eee ee eee 83 | Sorilla... 22.2... ec eee cece e ence eee 390 
Sesuvium. .........eceee cece cee eeeeeeeeereee 229 | Sorrel, mountain. ..........2.....2.22..20005 190 
Setariad . . 2... ecw cence ccc nsec cnsccccecccceee 60 sheep......--... 2. eee e eee ence ee ee eecees 191 
Shad scale. ........--0-- 2. eee eee eee eee ee 204 | Sotol........ 0. cece cece cece cece eeeenees 138 
Sheep Sorrel. ..........-20.00- eee ce cece ee ceee 191 | Southern Canary grass.............---.-.---- 61 
Sheepweed ............-.-2-.eeeeeeeeeeceeeee 658 | Sow thistle.........02. 2 ee eee eee eee eee ee 623 
Shepherdia...........-0-020 2 cece cece eee e ee eee 458 | Speargrass, low. ...........20eee cece cence ees 99 
Shepherd’s-purse. ......--.------------0----- 273 | Spearmint.............-..0.02ece ce eeeeeeeeee 554 
Shinleaf................20ee cece eee e ee cees .- 488 | Spectacle-pod.............2.--.2.-2-2-20 20 ee 269 
Shinnery oak.....-....-.-2-2-eeeeeee eee ee eee 172 | Specularia...........20-2 2. eee eee eee eee 616-617 
Shin-oak. ....... 0... eee eee cee eee eee ees 172 | Speedwell. .............. 22... c cece eee ee ee ee 588 
Shoestrings. ........--.------2--ee eens eeeeees 349 alpine. .......-..2..2.2 2-22 e eee ee eee ee eee 589 
Shooting star............---------2---eeeeeee 492 purslane... 2.22.2. 2 2.2 eee ee eee eee eee 589 
Shrubby cinquefoil......................004. 316 thyme-leaved.............2--..0-02-e0eee 590 
ts) (0) | 388 A a 589 
Sibbaldia.................2-22 222-2 e eee eee 315-316 | Spergula..........-2-..2.222 2. eee eee eee eee 238 
Sicydium. .............-. 0-2 e ee eee ee eee eee 615 | Spermacoce.......-...--.....0- eee cece eee eee 606 
Sicyos......-.2-.-.-- cece ee ee ee eee wee eeeeeeee 614 | Spermatophyta.........-...-----.------- ee 30-753 
Sida. ..............-222---- 418, 419, 493, 424,425-426 | Spermolepis...........-0-.eeeesceeececues 478-479 
Bidalcea... 2.2... eee eee eee eee e cee eens 418 | Sphaeraleea..........0-22 eee eee eee ee eee 420-424 
Sidanoda.............0 cece cece eee nese eeeees 427 | Sphaerostigma.............-.-..200eeeeeeeee 465 
Sideranthus. ......--...--.-0-. cee eee ee eens 663-665 | Sphenopholis. ................2- se eec eee eeeee 92 
Sieglingia. ........0- cence cece eee eee eee eeee 90,91 | Spiderwort................cc cece cece een eeeee 126 
Sieversia. .. 2.2.22... 2.2... e cece eee eee eee 316-317, 318 family.....-..--.-2----- eee eee eee eee eee 125-126 
Silenacese.........-0-.-- 22 eeee ee eee eee eee 240-242 | Spike rush.............--.. 02 -e eee eee eee eee 112 
Silene...........--- eee ee eee eee ee eee eee 241-242 | Spiny aster............. 002. c cece eee eeeeee 686 
Simarubacene. ..........- eee eee cece eee eee 390 | Spiraea..........-. cence cece cee eeeeeee $09, 310, 324 
Simsia. . 2.2... eee eee cee eee ee eee ee 712 | Spirodela......-.....-.-22- eee eee eee eee eee 124 
Simapis....-.--...---- 2. eee ee eee ee eee ee eens 281 | Spirostachys. -.......2-0.... eee eee e eee een eee 201 
Sisymbrium.............---------- 284, 285-286, 287 | Spleenwort........-....2cseecceeenceeeeeeees 24 
Sisyrinchium............-.-.--2------+- 0 147-148 | Sporobolus. .............-.....e2e2e eee 71,74, 75-77 
Sitanion. ............. 0. eee eee eee eee eee eee 107-108 | Sprangle........-2-..2-- eee eee eee eee eee 83 
Sitilias. 22... eee cee cece cece ewe eeee 624 | Spring beauty...........-...--2 ee eee ee ee eee 233 
Bium... 2... eee eee eee eee eee 479 | Spruce. ...- cece ee eee eee ee ee ee see eens 33 
Six-weeks grama. .........-.-------0--ee eee 86 Colorado blUC...-.2222seceeeeeeececeeees 34 
Needle Brass. .....--.-e cece nee e cece eeeeee 63 Douglas. .........cccc cee ee ees ceceeeesees 35 
Skullcap. .. 2.2... 20-2 ee eee eee eee eee eee 555 Engelmann.............20.0202ceeee scene 34 
Skunk cabbage........-..--0--ee cece eee ee eee 128 | Spurge... 2.2222... e eee eee cece cece ec eeeee 397 
Sleepy catchfly..........----seeee eee e eee eee 241 family............2--2..2- sence eens 393-405 
a cece wee een ee ce neeeseneeeeneenece 67 | Squaw root.......------2-- eee eee eee eee ee = 599 
Slender foxtail............-0-.2- ee eee ee eee 74 | Squirrel-tail grass........--...----------2--- 107 
wheat £TASS.. 2.1... ee cece cece e cece e eee 105 | Stachys......-....--2.0. 222 ee eee eee eee eee 565-566 
Slough grass. ........-.2... eee eee eee ee eee eens 84 | Staff-tree family..........-.-..---------0 409-410 
Small, J. K...2-. 2. eee eee cece eee 11 | Standley, Paul C., botanical work in New 
Smartweed....-....---2...---- eee eee ee eee eee 195 1) (-) 6 (0 5 
Smilacind. ........--2 cece c eee e eee cece eens 139 | Stanleya.... 2.2... cess c cee eee eeeeeenes 266-267 
Smooth scouring rush. ...........----.------ 28 | Stanleyella.......... 22... cece cece e eee cence 267 
Snakeweed.............. bec eeeccccceeccees 656,658 | Star thistle........2... 2... cece eee eee eee 749 
Sneezeweed . .... 2... eee wwe e ee cee eens 726,733 | Starwort......----------- eee eee eee eee neces 235 
SnowberTy . ......- 2-2-2 e eee e cece e cece ne eeees 610 V0) 405 
Snow-on-the-mountain............000eee eee 396 | State flower of Colorado.............------+- 248 
Soap, substitute............. 2s cece eee eee eee 136 | Statice.........- ween eee e cece ee eeneereeeeeees 490 
Soapberry.......---.- eee ences cee w ewe ee eees 412 | StegnocarpuS.............eeeeeceeeeeeeeeeres 536 
family...-...-.--- 22. ee eee eee eee eee eee 412 | Steironema..............0 2 cece eee e ee en sees 491 
Soapweed. ..........-.. cece eee eee ee eee eee 136 | Stellaria......-.0+---- 22 eee eee eee ence eens 235, 236 
Solanaceae... 2.2... eee eee eee e cece eee e eens 566-574 | Stenactis........cccececec cece eee ee cece eeenee 681 
Solanum........ eee e ence cence eeeeeeee 572-578, 674 | Stemandrium............---eeeeee eee eeeeeeeee 598 
Solidago. ...... Latte eee eee eee e eee e eee 667, 668-671 | Stemogonum.........--.---eeee cece eeeec eee 187 
Solomon’s seal..........---------0- eee eee eee 139 | Stenolobium.............. eee seen eee eeneee 601 
false... 2... e eee e cece cence eee eee ee eee eene 139 | Stemophyllus.......... sce eee eee ween eee 114 
Sonchus.......-0-cceeeeccn eee e cence eeeeees 622,623 | Stenotus......-..--cceeeeceneeeceeecnreres 666, 667 
Sophia. ..... weeeeewees wvecccceeccceeeences 286-288 | Stephanomeria.......+-++++ weeeeceee sereceeee 620 
