Colorado VVkkd Sekds 
, ;Many-spined Opuntia 58 
Marsh Elder 
Common 72 
Rough 72 
Small-flowered ... 72 
j Maruta corula 78 
-i May- weed 78 
j Meadow Buttercup . . 45 
f Meadow Grass 3 3 
Fowl 33 
Reed 33 
|: Medicago .... 20, 52, 54 
; lupulina 54 
Medick 54 
Black 54 
Melilotus 20, 52 
alba 54 
indica 54 
i officinalis 54 
' Milfoil 75 
! Milk Thistle 81 
Milkweed 
Family 59 
\ Showy 60 
Whorled 60 
Mint 
j Cat 65 
I Family 64 
Motherwort 
Common 64 
Mouse-ear Chick weed 42 
Mullein 67 
Common 67 
Great 67 
Mustard 46 
Black 47 
Family 46 
Hare’s-ear 49 
Hedge 49 
Indian 47 
Tumble 49 
I White 47 
Wild 47 
Narrow-leaved Puc- 
COON 62 
Nepeta 20, 64, 65 
cataria 65 
Nettle 34 
I Family 34 
Horse 66 
Slender 45 
Night-flow'ertng 
Catchfly 44 
. Nightshade 
Beaked 66 
Black 66 
Common 66 
, Cut-leaved 66 
Family 66 
Three-flowered ....66 
Nodding Wild Rye . . 32 
Nonesuch 54 
Norta 
altissima 4 0 
Northern Bedstraw . .70 
Oat 28 
Grass 28 
Wild 28 
Oenothera .... 20, 58, 59 
strigX'Sa 59 
Old Witch Grass .... 23 
ONAGRACEAE 58 
Opuntia 20, 58 
■ Many-spined 58 
missouriensis ..... 58 
polycantha 58 
Orache 39 
Halberd-leaved ... 40 
OX ARID ACE AE 56 
Oxalis 2 0, 56 
stricta 56 
Ox-eye Daisy 78 
Panic-grass 2 3 
Panicularia .... 20, 22, 33 
grandis 33 
nervata 3 3 * 
Panicum 20, 22 
. capillare 23 
Tall Smooth 24 
virgatum 23 
PAPAVERACEAE ... 46 
PAPILIONACEAE . . 52 
Pasture Sage-brush . .78 
Pea 52 
Family 52 
Wild 53 
Pear 58 
Prickley 58 
Penny Cress 48 
Pennsylvania Smart- 
weed 37 
Peppergrass 48 
Apetalous 48 
Peritoma 51 
serrulatum 51 
Pigweed 41 
Common 41 
Prostrate 41 
Rough 41 
Trailing 41 
Winged 38 
Pink 
Family 43 
Prairie 81 
Sand 81 
PLANTAGINACEAE. .68 
cSg 
Plantago 20 
lanceolata 21, 68 
major 21, 68 
Purshii 21, 68 
Rugelii 21, 68 
I’LANTAIN 
Broad-leaved 69 
Buckiiorn 21, 69 
Common 68 
Family 21, 68 
Pursh’s 21, 69 
Red- STEM 68 
Ru GEL’S 68 
Snake 69 
Plumed Thistle .... 76 
POLYGONACEAE ... 35 
Polygonum. .2 0, 35, 36, 37 
aviculare 37, 36 
convolvulus . . . .21, 36 
pennsylvanicum 36, 37 
persicaria 36 
Pomme-de-Prairie . . 53 
Poppy 46 
Family 46 
Prickley 46 
Thistle 46 
White 46 
Porcupine Grass .... 29 
Portulaca 20, 41 
oleracea 4l 
PORTULACACEAE ..41 
Potato Family 66 
Potentilla 20, 52 
monspeliensis 51 
Poverty Weed. .21, 70, 72 
Prairie 
Cone-flower 74 
Pink 81 
Pretty Dodder 61 
Prickley 46 
Lettuce 79 
Pear 58 
Poppy 46 
Primrose 58 
Evening 58, 59 
Family 58 
Prostrate Pigweed. . .41 
Prunella 2 0, 64 
vulgaris 65 
Psoralea .... 20, 52, 53 
Few-flowered .... 52 
tenuiflora 53 
PUCCOON 62 
Narrow-leaved .... 62 
Pulse Family 52 
Pursh’s Plantatn ... 21 
Purslane 41 
Common 41 
Family 41 
