90 
Coi.ORADo Agricultural College 
(JUACK GUA«S 31 
(JuiTCii Grass 30 
Kadish 50 
Wild 50 
Ragweed 70 
I3UR 70 
Family 71 
Great 71 
RANUNCUl.ACG'lAF ..45 
Ranunculus 2 0, 45 
acris 45 
l)ulbosus 4.5 
sceleratus 45 
Raphanus .... 20, 46, 50 
raphanistrum 50 
Ratibiaa 2 0 
co'umnaris 74 
volumnifera 7 4 
1:ld-seeded Dandelion . 82 
Red-stem Plantain ..6 3 
Reed Meadow Grass.. 3 3 
Resin Weed 7 7 
Rib-grass 6 ] 
Rice 2 4 
Jungle 2 4 
Rocky Mountain Bee 
Plant 51 
Roman Wormwood. . . .71 
Rosa 2 0, 51 
arkansana 51 
ROSACEAF 51 
Rose 51 
Arkansas 51 
Family 51 
Rough 52 
Cinquefoil 52 
Marsh Elder 72 
Pigweed 41 
RUBIACEAE 69 
Rugel’s Plantain ... 68 
Rumex 2 0, 35, 36 
acetosella 35 
crispus 35, 36 
persicarioide.s ..35, 36 
Rush 32, 34 
Family 34 
Crass 32 
Slender 34 
Russian Thistle .... 39 
Rye Grass 31 
Rye 
Nodding Wild- 32 
Wild 32 
Sage 
Eance-leaved 65 
Salt 71 
M'ood ■ 65 
Wormwood .... 71, 78 
Sage-brush 
Pasture 78 
Salsola 20, 38, 39 
pestifer 39 
Salt Bush 39 
Australian 3 9 
Salt Sage 71 
Saltwort 39 
Salvia 2 0, 65 
lanceolata 65 
Sand 32 
Drop-seed 32 
Pink 81 
Sandbur 2 3 
Saponaria 20, 43 
officinalis 43 
Scarlet 57, 5 9 
Butterfly- weed ... 59 
Mallow 57 
SCROPHULARI ACE A E 
67 
Sedge Family 33 
Self-heal 61 
Setaria 20, 22, 25 
glauca 25 
viridis 25 
Shad-scales 39 
*Sharp-fringed Sow- 
thistle 80 
Sheep Sorrel 35 
Shepherd’s Purse .... 50. 
Showy Milkweed ..60 
Silene 2 0, 43 
antirrhina 43 
noctiflora 43 
vulg-aris 4 3 
SiLKW'EED 60 
Sisymbrium . . 20, 4 6, 4 9 
altissimum 49 
officinale 4 9 
Skeleton Weed . . : . . 81 
Skunk Grass 32 
Sleepy Catchfi.y .... 4.3 
Slender 31, 3 4, 35 
Nettle 35 
Rush 34 
Wheat Grass 31 
Small Crab Grass . . 21 
Small-flowered 5 9 
Butterfly-weed . . . 59 
Marsh Elder 72 
Small-seeded Alfalfa 
Dodder 60, 21 
Smartweed 3 7 
Penn SYLVAN LA 37 
Snake Plant \in .... 69 
Snakfroct 73 
Putt ON 73 
Dotted Button ... 73 
Snapdragon 
Wild 6 7 
Snow-on-the- 
Mountain .... 57 
Soap wort 43 
Solanaceae 66 
Solanum 20 
nigrum 66 
rostratum 67 
triflorum 66 
Sonchus 20 
arvensis 21, 81 
aspcr 21, 80 
oleraceus 21, 80 
Sorrel 35 
Field 35 
Sheep 35 
Wood 56 
Yellow Wood .... 56 
Sow-thistle 21 
Annual 80 
Common 80 
Corn 81 
Field 81 
Sharp-fringed 80 
Spiny-leaved . . 21, 80 
Spear 2 9 
Grass 2 9 
Thistle 2 9 
Sphaeralcea 
coccinea 
Spiny Sow-thistle 21, 80 
Sporobolus .... 20, 22, 32 
cryptandrus 32 
Spurge 56 
Family 56 
White Margined . . 56 
Squirrel-tail Grass.. 37 
Starwort 4 2 
Stellaria 20, 42 
media 42 
Stickseed 62 
Hairy 62 
Sticktight 62 
Stink 32. 50 
Flower 50 
Grass 32 
Stipa 2 0. 2 2, 29 
comata 29 
spar tea 2 9 
Western 29 
Succory 
Wild 79 
Sunflower 
Common 7 7 
PRA’R’E 77 
Sweet Alyssuu .... 48 
Wild IS 
