| grass pondweed | 2 |
| gravel forget-me-not | 1 |
| gravel milkvetch | 4 |
| gravel-ghost | 2 |
| gray alder | 2 |
| gray fleabane | 1 |
| gray tansy aster | 3 |
| gray wild buckwheat | 1 |
| grayleaf draba | 2 |
| grayleaf willow | 5 |
| Gray's biscuitroot | 15 |
| Gray's licorice-root | 1 |
| Gray's wild buckwheat | 2 |
| graystem rubber rabbitbrush | 4 |
| gray-stem rubber rabbitbrush | 4 |
| graythorn | 2 |
| greasewood | 16 |
| Great Basin bristlecone pine | 8 |
| Great Basin cushion-daisy | 1 |
| Great Basin desert parsley | 5 |
| Great Basin Desert wild buckwheat | 1 |
| Great Basin desertparsley | 3 |
| Great Basin fishhook cactus | 1 |
| Great Basin gumweed tansy aster | 4 |
| Great Basin Indian potato | 7 |
| Great Basin langloisia | 12 |
| Great Basin sagebrush, big sagebrush | 3 |
| Great Basin shaggy fleabane | 5 |
| Great Basin wild buckwheat | 6 |
| Great Basin wildrye | 6 |
| Great Basin woollystar | 5 |
| Great Basin woollywhite | 6 |
| greater bladderpod milkvetch | 1 |
| greater rushy milkvetch | 11 |
| greater yellowthroat gilia | 1 |
| green bristlegrass | 6 |
| green ephedra | 22 |
| green molly | 12 |
| green needlegrass | 2 |
| green princesplume | 2 |
| Green River milkvetch | 2 |
| Green sedge | 1 |
| Greene's bird's-foot trefoil | 1 |
| Greene's rabbitbrush | 1 |
| green-flowered wintergreen | 4 |
| Greenland bluegrass | 3 |
| Greenland northern rockcress | 1 |
| greenleaf five eyes | 2 |
| greenleaf manzanita | 17 |
| greenleaf willow | 5 |
| greenstem paperflower | 8 |
| greenthread | 1 |
| grey aster | 4 |
| grey goldenaster | 1 |
| grey spreading fleabane | 2 |
| groundcover milkvetch | 4 |
| Ground-ivy | 1 |
| grouse whortleberry | 9 |
| gumbo milkvetch | 2 |
| gumweed | 1 |
| Gumweed aster | 1 |
| gumweed tansy aster | 12 |
| Gunnison's gilia | 11 |
| gypsum scorpionweed | 2 |
| gypsyflower | 16 |
| hair-like sedge | 1 |
| hairspine pricklypear | 8 |
| hairy arnica | 10 |
| hairy bigleaf lupine | 1 |
| hairy clematis | 8 |
| hairy crabgrass | 2 |
| hairy crinklemat | 1 |
| hairy desert-sunflower | 3 |
| hairy evening primrose | 1 |
| hairy fiddleleaf hawksbeard | 1 |
| hairy goldenaster | 21 |
| hairy northern rockcress | 1 |
| hairy rockcress | 2 |
| hairy Townsend-daisy | 1 |
| hairy turtleback | 2 |
| Hairy wheatgrass | 1 |
| hairy woollygrass | 10 |
| hairy yellow rabbitbrush | 1 |
| Hall's milkweed | 1 |
| Hall's panicgrass | 1 |
| Hall's rush | 1 |
| Halogeton | 1 |
| Hammerwort | 1 |
| Hansen's summer clover | 1 |
| hare's ear mustard | 1 |
| Harkness' flaxflower | 1 |
| Harrison's milkvetch | 2 |
| Harrison's stickseed | 3 |
| harsh paintbrush | 1 |
| hawksbeard | 3 |
| hawthorn | 1 |
| Hayden's rimmed navel lichen | 1 |
| Hayden's two-grooved milkvetch | 1 |
| Head sandwort | 1 |
| heart-leaf Alexanders | 1 |
| heartleaf arnica | 3 |
| heart-leaf arnica | 17 |
| heart-leaf bittercress | 16 |
| heart-leaf buttercup | 3 |
| heart-leaf four o'clock | 1 |
| heart-leaf twistflower | 17 |
| hedge false bindweed | 1 |
| Heermann's wild buckwheat | 3 |
| Heller's draba | 1 |
| Heller's rosette grass | 1 |
| hemlock water parsnip | 2 |
| henbit deadnettle | 5 |
| Henderson's rock parsley | 14 |
| heppia lichen | 2 |
| hermit milkvetch | 1 |
| hidden-flower scorpionweed | 2 |
| Higgins' beardtongue | 2 |
| Higgins' milkvetch | 1 |
| Hill's silvery lupine | 1 |
| hilograss | 1 |
| Himalayan blackberry | 2 |
| hoary sandmat | 1 |
| hoary scorpionweed | 3 |
| hoary tansyaster | 1 |
| hoary tansyaster, grey tansyaster | 8 |
| hollyhock | 1 |
| hollyleaf clover | 3 |
| hollyleaf redberry | 1 |
| Holm sedge | 1 |
| Holm's ragwort | 3 |
| Holostem | 1 |
| Holosteum | 2 |
| honey mesquite | 5 |
| honeylocust | 2 |
| hooded coralroot | 5 |
| Hooded ladies tresses | 3 |
| Hooded ladies-tresses | 1 |
| Hood's sedge | 10 |
| hooked bristlegrass | 3 |
| Hooker's balsamroot | 12 |
| Hooker's evening primrose | 2 |
| Hooker's sandwort | 5 |
| Hooker's wild buckwheat | 3 |
| hook-spur violet | 25 |
| Hoover's biscuitroot | 3 |
| hop | 1 |
| hop sedge | 1 |
| hophornbeam | 1 |
| Hopi blanketflower | 13 |
| Hopi milkvetch | 1 |
| horehound | 4 |
| horned spurge | 17 |
| Hornemann's willowherb | 10 |
| horse chestnut | 1 |
| horsehair lichen | 2 |
| horsetail | 4 |
| horsetail milkweed | 4 |
| hot-rock beardtongue | 1 |
| houndstongue hawkweed | 1 |
| Houndstoung hawkweed | 1 |
| House Range primrose | 1 |
| Howard's evening primrose | 3 |
| Howard's rabbitbrush | 1 |
| Howell's biscuitroot | 1 |
| Huntington rubber rabbitbrush | 1 |
| hybrid arnica | 4 |
| hybrid hawksbeard | 8 |
| hybrid Indianhemp | 1 |
| hybrid Indian-hemp | 2 |
| hydrothyria lichen | 1 |
| hyssop-leaf fleabane | 1 |
| Ibapah tickweed | 5 |
| Idaho blue-eyed grass | 4 |
| Idaho esslingeriana lichen | 1 |
| Idaho fescue | 3 |
| Idaho licorice-root | 7 |
| incense cedar | 1 |
| India mustard | 2 |
| Indian Canyon fleabane | 1 |
| Indian goosegrass | 1 |
| Indian paintbrush | 2 |
| Indian ricegrass | 16 |
| Indian strawberry | 1 |
| Indianhemp | 1 |
| Indian-hemp | 6 |
| Indian's dream | 1 |
| inland sedge | 1 |
| interior bluegrass | 3 |
| intermediate barley | 2 |
| intermediate needle and thread | 2 |
| Intermediate wheat grass | 1 |
| Intermediate wheatgrass | 1 |
| Intermountain Indian breadroot | 1 |
| Intermountain mousetail | 3 |
| Intermountain rubberweed | 4 |
| iodinebush | 6 |
| iris | 1 |
| Isely's milkvetch | 1 |
| island cetraria lichen | 1 |
| Ives' four-nerve daisy | 8 |
| Ives' scorpionweed | 15 |
| Jacob's-ladder | 1 |
| Jakutsk snow parsley | 1 |
| James' beardtongue | 1 |
| James' cat's eye | 3 |
| James' galleta | 15 |
| Japanese barberry | 1 |
| Japanese bristlegrass | 1 |
| Japanese flowering cherry | 1 |
| Japanese yew | 1 |
| Japanese zelkova | 1 |
| jelly lichen | 1 |
| Jersey cudweed | 1 |
| Jerusalem oak goosefoot | 3 |
| jimsonweed | 2 |
| johnny jump-up | 2 |
| Johnsongrass | 3 |
| jointed goatgrass | 2 |
| jointleaf rush | 2 |
| Jones' beardtongue | 4 |
| Jones' bluestar | 2 |
| Jones' cat's eye | 1 |
| Jones' dalea | 1 |
| Jones' fleabane | 3 |
| Jones' goldenaster | 1 |
| Jones' indigobush | 1 |
| Jones' indigo-bush | 1 |
| Jone's oxytrope | 3 |
| Jones' pepperweed | 23 |
| Jones' southern phlox | 1 |
| Jones' spring parsley | 1 |
| Jones' Townsend-daisy | 6 |
| Jones' waxy dogbane | 2 |
| jonquil | 1 |
| Jove's buttercup | 2 |
| Judd's grass | 1 |
| jumping cholla | 1 |
| juniper biscuitroot | 2 |
| juniper leaf | 1 |
| Juniper mistletoe | 4 |
| juniper polytrichum moss | 1 |
| Kaiparowits milkvetch | 2 |
| Kamchatica rockcress | 1 |
| Kanab prairie-clover | 3 |
| Kass' draba | 9 |
| Kellogg's knotweed | 3 |
| Kellogg's sedge | 5 |
| Kentucky bluegrass | 7 |
| kidneyleaf grass of Parnassus | 1 |
| kidney-leaf wild buckwheat | 4 |
| King's angelica | 5 |
| King's birdbeak | 2 |
| King's biscuitroot | 5 |
| Kings bladderpod | 1 |
| King's bladderpod | 4 |
| King's clover | 3 |
| King's eyelashgrass | 2 |
| King's flax | 8 |
| King's lupine | 3 |
| King's ragwort | 12 |
| King's sandwort | 11 |
| kinnikinnick | 6 |
| knotgrass | 1 |
| Labrador lousewort | 1 |
| lacy germander | 1 |
| ladder wild buckwheat | 1 |
| Lake goldenrod | 1 |
| lakeshore sedge | 1 |
| Lambert's locoweed | 1 |
| lambsquarters | 4 |
| lambstongue ragwort | 1 |
| lance selfheal | 7 |
| lanceleaf goldenweed | 7 |
| lanceleaf springbeauty | 1 |
| lancepod draba | 10 |
| Lanszwert's vetchling | 9 |
| large -flowered fleabane | 5 |
| large mountain fleabane | 1 |
| largeflower skeletonplant | 1 |
| Largeflower skeletonweed | 1 |
| large-flowered triteleia | 3 |
| large-flowered wild onion | 10 |
| large-flowered wintergreen | 1 |
| largehead clover | 1 |
| large-leaf avens | 18 |
| larkspur | 1 |
| Larkspur-leaf Monkshood | 1 |
| Last Chance Townsend-daisy | 1 |
| Lavandula evening-primrose | 1 |
| lavender-leaf sundrops | 10 |
| lawndaisy | 1 |
| leadplant | 1 |
| leafless larkspur | 4 |
| leafy nama | 1 |
| least duckweed | 1 |
| least spring parsley | 1 |
| ledge stonecrop | 1 |
| Lehmann lovegrass | 1 |
| Lemmon's fleabane | 1 |
| Lemmon's sage | 1 |
| Lemmon's spring parsley | 7 |
| lens-podded whitetop | 3 |
| Leonard's beardtongue | 13 |
| leopard-lily | 8 |
| lesser bladderwort | 2 |
| lesser burdock | 5 |
| lesser rushy milkvetch | 21 |
| lesser spikemoss | 2 |
| lesser wintergreen | 3 |
| lesser yellowthroat gilia | 2 |
| Letterman's needlegrass | 5 |
| Lewis' blue flax | 8 |
| Lewis' monkeyflower | 5 |
| Lewis River suncup | 1 |
| Licorice | 1 |
| licorice bedstraw | 1 |
| Liddon sedge | 1 |
| limber pine | 17 |
| limestone bedstraw | 2 |
| Lindley's silverpuffs | 4 |
| lingonberry | 1 |
| little barley | 2 |
| little bluestem | 2 |
| little desert trumpet | 10 |
| little duckweed | 1 |
| little grapefern | 2 |
| little green sedge | 1 |
| little hogweed | 2 |
| little lovegrass | 1 |
| little redstem monkeyflower | 5 |
| little wiry suncup | 1 |
| littlecup beardtongue | 8 |
| little-leaf alumroot | 24 |
| little-leaf horsebrush | 8 |
| little-leaf linden | 1 |
| little-leaf mock orange | 5 |
| little-leaf mountain mahogany | 7 |
| little-leaf pussytoes | 30 |
| little-leaf ratany | 9 |
| littlepod false flax | 8 |
| littleseed ricegrass | 2 |
| liverleaf wintergreen | 3 |
| Loa milkvetch | 1 |
| lobeleaf groundsel | 58 |
| locoweed | 1 |
| lodgepole pine | 11 |
| Logan wild buckwheat | 2 |
| Lombardy poplar | 1 |
| London rocket | 3 |
| long-beaked streptanthella | 15 |
| long-flowered cat's eye | 1 |
| long-flowered gilia | 2 |
| long-flowered snowberry | 8 |
| longhorn plectritis | 1 |
| longhorn steer's-head | 2 |
| long-leaf brickellbush | 2 |
| long-leaf fleabane | 4 |
| long-leaf groundcherry | 3 |
| longleaf phlox | 1 |
| long-leaf phlox | 39 |
| long-leaf pondweed | 1 |
| long-leaf starwort | 1 |
| long-leaf suncup | 2 |
| longspine horsebrush | 2 |
| long-stalked spring parsley | 11 |
| longstem evening primrose | 2 |
| longstyle rush | 2 |
| looseflower sandwort | 3 |
| loose-flowered milkvetch | 10 |
| loose-flowered thelypody | 4 |
| loose-leaf wild buckwheat | 16 |
| Lori's columbine | 1 |
| Louisiana vetch | 4 |
| Louisiana wormwood | 19 |
| Louisiana wormwood, white sagebrush | 5 |
| low beardtongue | 6 |
| low cat's eye | 4 |
| low goldenrod | 20 |
| low northern rockcress | 77 |
| low penstemon | 1 |
| low pussytoes | 2 |
| low sagebrush | 2 |
| low scorpionweed | 2 |
| low Townsend-daisy | 3 |
| low woollygrass | 7 |
| lung lichen | 1 |
| lupine | 1 |
| Lyall's anemone | 1 |
| lyreleaf greeneyes | 1 |
| lyreleaf sage | 1 |
| Lyre-leaved western rockcress | 1 |
| Macdougal's bluebells | 1 |
| Macdougal's desert biscuitroot | 5 |
| Macomb's gilia | 1 |
| Macoun's buttercup | 7 |
| Maguire's fleabane | 2 |
| Mahaleb cherry | 1 |
| maiden blue eyed Mary | 20 |
| maidenhair tree | 2 |
| male fern | 2 |
| mallow ninebark | 23 |
| Mancos columbine | 8 |
| many-flowered monkeyflower | 4 |
| many-flowered stickseed | 12 |
| many-flowered stoneseed | 8 |
| many-flowered thread-leaf | 1 |
| maple | 1 |
| mapleleaf viburnum | 1 |
| marginal woodfern | 1 |
| mariola | 2 |
| mariposa lily | 1 |
| marsh arrowgrass | 2 |
| marsh elder | 1 |
| marsh felwort | 1 |
| marsh violet | 1 |
| marshland goosefoot | 1 |
| Martin's ceanothus | 7 |
| Martin's milkvetch | 3 |
| Marysvale fleabane | 2 |
| Marysvale milkvetch | 5 |
| mat beardtongue | 1 |
| mat muhly | 3 |
| mat pigweed | 1 |
| mat rockspirea | 1 |
| mat saltbush | 6 |
| mat sandbur | 1 |
| matchweed | 1 |
| matrimony vine | 3 |
| matroot beardtongue | 2 |
| matted crinklemat | 7 |
| matted wild buckwheat | 3 |
| Maule's quince | 1 |
| mayweed | 6 |
| McConnell's poppy | 1 |
| meadow barley | 6 |
| meadow fescue | 5 |
| meadow foxtail | 7 |
| meadow larkspur | 35 |
| meadow sedge | 1 |
| meadow starwort | 12 |
| meadow thistle | 2 |
| meadow thistle, elk thistle | 1 |
| meadow-beauty paintbrush | 22 |
| mealy goosefoot | 1 |
| Mecca aster | 1 |
| Menzies' campion | 4 |
| Menzies' fiddleneck | 1 |
| Menzies' spirea | 1 |
| merckia | 1 |
| Mertens' rush | 5 |
| mesa dropseed | 6 |
| mesa tansy aster | 1 |
| mesquite mistletoe | 3 |
| Mexican bladdersage | 8 |
| Mexican lovegrass | 2 |
| Mexican mosquitofern | 3 |
| Mexican windmill grass | 1 |
| Mexican xanthoparmelia lichen | 1 |
| Mexico cliffrose | 5 |
| Michaux's wormwood | 9 |
| milkvetch | 4 |
| milkweed milkvetch | 6 |
| Miners lettuce | 4 |
| miner's pepperweed | 3 |
| Miners-lettuce | 5 |
| miniature woollystar | 5 |
| Missouri goldenrod | 1 |
| Missouri gourd | 3 |
| Missouri River willow | 2 |
| Moab aster | 1 |
| Moapa bladderpod | 2 |
| modest crescent milkvetch | 3 |
| Modoc hawksbeard | 1 |
| Modoc yellowcress | 3 |
| Moenkopi milkvetch | 3 |
| moist sowthistle | 1 |
| Mojave aster | 6 |
| Mojave carveseed | 5 |
| Mojave ceanothus | 4 |
| Mojave desertstar | 2 |
| Mojave panicgrass | 1 |
| Mojave rabbitbrush | 2 |
| Mojave small-flowered milkvetch | 10 |
| Mojave suncup | 5 |
| Mojave woodyaster | 1 |
| Mojave yucca | 2 |
| money buckwheat | 3 |
| Mono ragwort | 3 |
| Montane groundsel | 1 |
| Moonpod | 2 |
| Moore's globemallow | 1 |
| Morey Peak freckled milkvetch | 1 |
| Mormon needlegrass | 2 |
| Morning lily, handkerchief plant | 1 |
| Morning lily, tuffted evening primrose | 1 |
| Morning-lily | 1 |
| moss campion | 16 |
| moss phlox | 2 |
| mound saltbush | 1 |
| Mountain alder | 1 |
| mountain bladderfern | 1 |
| mountain bluebells | 7 |
| mountain cat's eye | 1 |
| mountain dandelion | 9 |
| mountain death camas | 16 |
| mountain draba | 2 |
| Mountain foxtail | 2 |
| mountain goldenbanner | 13 |
| mountain grass of Parnassus | 2 |
| mountain gray tansy aster | 6 |
| Mountain groundsel | 1 |
| mountain harebell | 1 |
| mountain monardella | 22 |
| mountain muhly | 3 |
| mountain oxytrope | 3 |
| mountain pepperweed | 6 |
| mountain phlox | 2 |
| mountain rush | 18 |
| mountain sedge | 3 |
| mountain sneezeweed | 3 |
| mountain snowberry | 7 |
| mountain spiny milkvetch | 20 |
| mountain strawberry | 10 |
| mountain tarweed | 5 |
| mountain thistle | 1 |
| mountain-ash | 7 |
| Mountains Canada goldenrod | 4 |
| mountainspray | 21 |
| mouse barley | 5 |
| mouse-ear chickweed | 8 |
| mouseear cress | 2 |
| Mt. Hood pussypaws | 1 |
| Mt. Naomi beardtongue | 1 |
| mugo pine | 1 |
| mule-ears | 1 |
| mule's ears | 13 |
| multiflora rose | 1 |
| Muncy rockcress | 1 |
| Munroe's globemallow | 3 |
| Murdock's thistle | 1 |
| Musinea ragwort | 1 |
| musk monkeyflower | 2 |
| musky phlox | 1 |
| Mussentuchit Creek gilia | 1 |
| muttongrass | 18 |
| myrtle spurge | 3 |
| nail lichen | 1 |
| nakedstem sunray | 13 |
| narrow-fruit northern rockcress | 6 |
| narrow-leaf beardtongue | 1 |
| narrow-leaf brickellbush | 4 |
| narrow-leaf bur-reed | 5 |
| narrowleaf cottonwood | 9 |
| narrow-leaf cottonwood | 12 |
| narrow-leaf desert primrose | 2 |
| narrow-leaf dock | 1 |
| narrow-leaf goldenbush | 4 |
| narrow-leaf goosefoot | 4 |
| narrow-leaf hawksbeard | 1 |
| narrow-leaf paintbrush | 1 |
| narrow-leaf plantain | 6 |
| narrow-leaf Preuss' milkvetch | 4 |
| narrow-leaf saw-wort | 1 |
| narrow-leaf stoneseed | 13 |
| Narrowleaf umbrellawort | 1 |
| narrow-leaf wild parsley | 2 |
| narrowleaf willow | 5 |
| narrow-leaf willow | 13 |
| narrowleaf yellow rabbitbrush | 3 |
| narrowleaf yerba santa | 1 |
| narrow-leaf yerba santa | 6 |
| narrow-leaf yucca | 2 |
| narrow-stemmed forget-me-not | 10 |
| Navajo Mountain phlox | 1 |
| Navajo tea greenthread | 17 |
| Navajo tufted evening primrose | 6 |
| Nealley's sprangletop | 1 |
| Nebraska sedge | 15 |
| needle and thread | 7 |
| needle grama | 1 |
| needle spikerush | 4 |
| needle-leaf pincushion plant | 1 |
| needleleaf sedge | 2 |
| Nelson's larkspur | 1 |
| netleaf willow | 1 |
| nettleleaf goosefoot | 2 |
| nettle-leaf horse-mint | 17 |
| Nevada biscuitroot | 2 |
| Nevada dalea | 3 |
| Nevada forget-me-not | 4 |
| Nevada gilia | 8 |
| Nevada goldeneye | 4 |
| Nevada jointfir | 8 |
| Nevada rabbitbrush | 2 |
| Nevada wild onion | 11 |
| New England aster | 1 |
| New Mexico bird's-foot trefoil | 4 |
| New Mexico fleabane | 1 |
| New Mexico groundsel | 1 |
| New Mexico locust | 2 |
| New Mexico maple | 9 |
| New Mexico muhly | 1 |
| New Mexico rim lichen | 1 |
| New Mexico scorpionweed | 1 |
| New Mexico thistle | 12 |
| Newberry's milkvetch | 4 |
| Newberry's twinpod | 5 |
| nodding beggarticks | 3 |
| nodding bluegrass | 6 |
| nodding buckwheat | 2 |
| nodding chickweed | 6 |
| nodding plumeless thistle | 4 |
| nodding rockcress, low rockcress | 1 |
| nodding saxifrage | 3 |
| nodding silverpuffs | 8 |
| nodding sunray | 6 |
| nodding wild buckwheat | 9 |
| nodding wild onion | 7 |
| nodule cracked lichen | 1 |
| Nohoanu, hinahina | 1 |
| northern bedstraw | 5 |
| northern bluebells | 1 |
| northern bog orchid | 1 |
| northern bog violet | 12 |
| northern catalpa | 2 |
| northern dandelion | 1 |
| northern hollyfern | 2 |
| northern linanthus | 2 |
| northern maidenhair | 1 |
| northern primrose | 2 |
| northern sweetcetch | 1 |
| northern Sweetvetch | 22 |
| northern tansy mustard | 2 |
| northern twayblade | 1 |
| northern water-starwort | 3 |
| Northwest Territory sedge | 12 |
| northwestern shaggy fleabane | 2 |
| Norway maple | 3 |
| Norway sedge | 2 |
| Norwegian cinquefoil | 4 |
| notch-leaf scorpionweed | 32 |
| Nuttall's alkaligrass | 5 |
| Nuttall's crinklemat | 1 |
| Nuttall's horsebrush | 4 |
| Nuttall's linanthus | 8 |
| Nuttall's lobelia | 1 |
| Nuttall's povertyweed | 12 |
| Nuttall's sandwort | 6 |
| Nuttall's sunflower | 5 |
| Nuttall's toothwort | 1 |
| Nuttall's violet | 23 |
| obtuse sedge | 2 |
| oceanspray | 1 |
| ocotillo | 2 |
| Ohio buckeye | 3 |
| old man's whiskers | 10 |
| old-man-in-the-Spring | 3 |
| oleander | 3 |
| one-flowered kelseya | 1 |
| one-flowered little sunflower | 12 |
| oneseed hawthorn | 2 |
| onespike danthonia | 1 |
| onion spring parsley | 7 |
| oniongrass | 6 |
| opposite-leaf bahia | 1 |
| orange agoseris | 13 |
| orange day-lily | 2 |
| orange eye butterflybush | 5 |
| orange hawkweed | 2 |
| orange lichen | 1 |
| orange sneezeweed | 14 |
| Orchard grass | 1 |
| orchardgrass | 7 |
| Orcutt's lupine | 6 |
| oregano | 1 |
| Oregon boxleaf | 6 |
| Oregon checkerbloom | 8 |
| Oregon cliff fern | 5 |
| Oregon lung lichen | 1 |
| Oregon willowherb | 3 |
| Oregongrape | 17 |
| Oriental lady's thumb | 1 |
| Oriental virginsbower | 6 |
| Oriental virgins-bower | 8 |
| orpine stonecrop | 10 |
| osage orange | 1 |
| Osterhout's beardtongue | 1 |
| Osterhout's cat's eye | 3 |
| Owens Valley beardtongue | 5 |
| owl's-claws, orange-sneezeweed | 1 |
| Ownbey's thistle | 4 |
| ox-eye daisy | 7 |
| Pacific alpinegold | 1 |
| Pacific sagewort | 9 |
| Pacific small fescue | 1 |
| painted desert milkvetch | 1 |
| painted mat beardtongue | 4 |
| painted milkvetch | 10 |
| Paiute suncup | 6 |
| Palander's draba | 1 |
| pale agoseris | 1 |
| pale bastard toadflax | 1 |
| pale desert-thorn | 6 |
| Pale Evening Primrose | 11 |
| Pale evening-primrose | 15 |
| pale false mannagrass | 1 |
| pale Lanszwert's vetchling | 4 |
| pale madwort | 2 |
| pale narrow-leaf paintbrush | 15 |
| pale paintbrush | 1 |
| pale pigweed | 1 |
| pale purple coneflower | 1 |
| pallid egg milkvetch | 10 |
| pallid hoptree | 4 |
| pallid milkweed | 12 |
| Palmer's beardtongue | 10 |
| Palmer's desert tobacco | 1 |
| Palmer's Indian mallow | 1 |
| Palmer's onion | 4 |
| Palmer's wild buckwheat | 6 |
| Panamint spring parsley | 6 |
| Panguitch buckwheat | 1 |
| Panguitch milkvetch | 1 |
| Panguitch wild buckwheat | 1 |
| panicled bulrush | 6 |
| panther milkvetch | 1 |
| paper birch | 1 |
| Paradox breadroot | 2 |
| Paradox cat's eye | 1 |
| Paradox milkvetch | 4 |
| Paradox spiny tansyaster | 1 |
| parasol bladderpod | 3 |
| Paria spurge | 1 |
| Parish's needlegrass | 1 |
| Parish's biscuitroot | 3 |
| Parish's larkspur | 1 |
| Parish's sandmat | 1 |
| Parish's snowberry | 5 |
| Parish's umbrellawort | 7 |
| Parry pinyon | 1 |
| Parry's agave | 1 |
| Parry's arnica | 4 |
| Parry's aster | 8 |
| Parry's bellflower | 7 |
| Parry's bladderpod milkvetch | 5 |
| Parry's blanketflower | 2 |
| Parry's clover | 7 |
| Parry's desert parsley | 6 |
| Parry's gentian | 1 |
| Parry's goldenrod | 4 |
| Parry's lipfern | 2 |
| Parry's lousewort | 3 |
| Parry's oxytrope | 7 |
| Parry's primrose | 12 |
| Parry's rush | 2 |
| Parry's sandmat | 3 |
| Parry's sandpaper plant | 5 |
| Parry's suncup | 9 |
| Parry's wild buckwheat | 3 |
| parsley fern | 3 |
| Parsley-fern | 1 |
| parsnip-flowered wild buckwheat | 11 |
| patience dock | 4 |
| Patterson's bluegrass | 2 |
| pavement scorpionweed | 1 |
| pawpaw | 1 |
| Payson's draba | 2 |
| Payson's lousewort | 6 |
| Payson's sedge | 1 |
| pea | 1 |
| peach | 1 |
| peach thorn | 1 |
| peachleaf willow | 2 |
| pearly pussytoes | 1 |
| pebble pincushion | 8 |
| Pecan | 1 |
| pelotazo | 1 |
| peltula lichen | 1 |
| Pennell's beardtongue | 2 |
| Pennell's draba | 5 |
| Pennsylvania bittercress | 1 |
| Pennsylvania blackberry | 1 |
| Pennsylvania cinquefoil | 1 |
| Pennsylvania pellitory | 2 |
| Peppermint | 1 |
| pepperweed | 1 |
| perennial fringed gentian | 2 |
| perennial ryegrass | 3 |
| perennial sowthistle | 2 |
| perennial sweetpea | 4 |
| Peruvian zinnia | 1 |
| phacelia | 1 |
| phlox | 1 |
| phlox heliotrope | 2 |
| pillar gumweed | 1 |
| pin cushion flower | 1 |
| pincushion | 1 |
| pincushion beardtongue | 12 |
| pine needlegrass | 2 |
| Pine Valley milkvetch | 1 |
| pineapple weed | 3 |
| pine-barren rush | 1 |
| pineland dwarf mistletoe | 2 |
| pineland valerian | 1 |
| pinemat manzanita | 1 |
| pineywoods geranium | 8 |
| pink alumroot | 18 |
| pink funnel lily | 2 |
| pink mountainheath | 1 |
| pinkhead smartweed | 1 |
| pinkladies | 2 |
| pinnate tansy mustard | 1 |
| pinnate tansy-mustard | 1 |
| pinyon dwarf mistletoe | 1 |
| pinyon goosefoot | 1 |
| pinyon groundsmoke | 6 |
| plains blackfoot | 2 |
| plains flax | 3 |
| plains lovegrass | 1 |
| plains pricklypear | 1 |
| plains reedgrass | 1 |
| Plains scrufpea | 1 |
| Plains scurfpea | 2 |
| plains spring parsley | 1 |
| plateau catchfly | 2 |
| plateau fleabane | 6 |
| plateau scorpionweed | 7 |
| plateau vetchling | 10 |
| pleated gentian | 3 |
| plum | 3 |
| plumeweed | 1 |
| pointed gumweed | 1 |
| pointleaf manzanita | 4 |
| poison angelica | 2 |
| poison hemlock | 4 |
| polytrichum moss | 1 |
| pomegranate | 1 |
| ponderosa pine | 9 |
| Porsild's saxifrage | 1 |
| Porter's licorice-root | 4 |
| poverty brome | 1 |
| poverty rush | 3 |
| povertyweed | 5 |
| Powell's orach | 1 |
| prairie cinquefoil | 1 |
| prairie coneflower | 2 |
| prairie cordgrass | 1 |
| prairie evening primrose | 12 |
| prairie Junegrass | 7 |
| prairie sagewort | 10 |
| prairie spiderwort | 7 |
| prairie sunflower | 6 |
| prairie thermopsis | 3 |
| prairie-clover | 1 |
| pretty cinquefoil | 2 |
| pretty shooting star | 1 |
| pretty shootingstar | 2 |
| pretty shooting-star | 3 |
| pretty wild buckwheat | 9 |
| prickly currant | 1 |
| prickly lettuce | 5 |
| prickly rose | 1 |
| prickly Russian thistle | 5 |
| prickly-leaf dogweed | 1 |
| pricklypear | 2 |
| Pringle manzanita | 2 |
| pullup muhly | 2 |
| pumpkin ash | 1 |
| puncturevine | 5 |
| purple avens | 2 |
| purple bird's-beak | 3 |
| purple cat's breeches | 15 |
| purple cushion wild buckwheat | 15 |
| purple fleabane | 2 |
| purple locoweed | 4 |
| purple loosestrife | 2 |
| purple morning-glory | 1 |
| purple mountain saxifrage | 1 |
| purple poppymallow | 1 |
| purple reedgrass | 3 |
| purple sage | 9 |
| purple spring parsley | 14 |
| purple threeawn | 11 |
| purple virgins-bower | 7 |
| purpledisk little sunflower | 2 |
| purple-fringed riccia | 1 |
| purplemat | 3 |
| purple-nerved spring parsley | 1 |
| purple-rooted forget-me-not | 14 |
| purpletop tridens | 1 |
| purplish white owl's-clover | 3 |
| Pursh seepweed | 3 |
| Pursh's plantain | 1 |
| pygmy poppy | 4 |
| pygmy pussytoes | 1 |
| pygmy sagebrush | 7 |
| pygmy saxifrage | 3 |
| pygmy summer clover | 4 |
| pygmy-flowered rockjasmine | 24 |
| quackgrass | 2 |
| quaking aspen | 17 |
| Queen Anne's lace | 3 |
| Quinn Canyon Range bladderpod | 1 |
| ragged rockflower | 1 |
| ragleaf | 4 |
| ragwort | 1 |
| Rainier pleated gentian | 6 |
| rampion bellflower | 2 |
| ratany | 1 |
| rattlesnake brome | 5 |
| rattlesnake weed | 10 |
| Raup's paintbrush | 1 |
| ray hymenopappus | 1 |
| rayless alkali aster | 1 |
| rayless shaggy fleabane | 7 |
| Rayless tansyaster | 1 |
| Raynolds' sedge | 2 |
| red baneberry | 10 |
| red barberry | 1 |
| red bluet | 1 |
| red brome | 6 |
| Red Canyon beardtongue | 1 |
| red clover | 4 |
| red currant | 1 |
| red elderberry | 3 |
| red fescue | 1 |
| red fruit bearberry | 2 |
| red goosefoot | 2 |
| red grama | 1 |
| red hickory | 1 |
| Red horsechestnut | 1 |
| red maple | 3 |
| red sandspurry | 6 |
| red swampfire | 1 |
| red valerian | 1 |
| red willow | 4 |
| redclay suncup | 1 |
| red-flowered currant | 1 |
| redosier dogwood | 32 |
| redroot buckwheat | 3 |
| redroot flatsedge | 3 |
| redroot pigweed | 4 |
| redroot wild buckwheat | 15 |
| redstem stork's bill | 9 |
| red-stemmed cinquefoil | 5 |
| red-stemmed silvery lupine | 9 |
| redwool plantain | 2 |
| reed canarygrass | 5 |
| rescuegrass | 3 |
| resin birch | 7 |
| Reveal's paintbrush | 3 |
| Rhubarb, pie plant | 1 |
| ribseed sandmat | 2 |
| Richardson's bittercress | 1 |
| Richardson's geranium | 15 |
| Richardson's phlox | 2 |
| Richardson's rubberweed | 5 |
| rigid spineflower | 4 |
| rim lichen | 3 |
| rimrock milkvetch | 7 |
| ring lichen | 2
|
