Complete list of species
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| scientific name | common name(s) | image gallery |
| Arctostaphylos ×laxiflora | Lazyflower Manzanita Manzanita | |
| Arctostaphylos ×media | Intermediate Manzanita Manzanita | |
| Arctostaphylos ×parvifolia | Gravel Manzanita Small-leaf Manzanita | |
| Arctostaphylos ×repens | PMC Manzanita | |
| Ardisia escallonioides | Island Marlberry Marbleberry Marlberry | |
| Arenaria aberrans | Mount Dellanbaugh Sandwort Mt. Dellenbaugh Matted Sandwort Mt. Dellenbaugh Sandwort | |
| Arenaria aculeata | Prickly Sandwort | |
| Arenaria benthamii | Hilly Sandwort | |
| Arenaria capillaris | Beautiful Sandwort Slender Mountain Sandwort | |
| Arenaria capillaris ssp. americana | Fescue Sandwort | |
| Arenaria capillaris ssp. capillaris | Slender Mountain Sandwort | |
| Arenaria congesta | Ballhead Sandwort | |
| Arenaria congesta var. cephaloidea | Sharptip Sandwort | |
| Arenaria congesta var. charlestonensis | Charleston Sandwort | |
| Arenaria congesta var. congesta | Baldhead Sandwort Ball-head Matted Sandwort Ballhead Sandwort Capitate Sandwort | |
| Arenaria congesta var. crassula | Ballhead Sandwort Rough Sandwort | |
| Arenaria congesta var. glandulifera | Gland Sandwort | |
| Arenaria congesta var. lithophila | Loosehead Sandwort Rock-loving Sandwort | |
| Arenaria congesta var. prolifera | Ballhead Sandwort | |
| Arenaria congesta var. simulans | Ballhead Sandwort Capitate Sandwort | |
| Arenaria congesta var. subcongesta | Ballhead Sandwort Capitate Sandwort Loosehead Sandwort | |
| Arenaria congesta var. suffrutescens | Suffrutescent Sandwort | |
| Arenaria congesta var. wheelerensis | Ballhead Sandwort Wheeler's Sandwort | |
| Arenaria eastwoodiae | Eastwood's Matted Sandwort Eastwood's Sandwort | |
| Arenaria eastwoodiae var. adenophora | Eastwood's Sandwort | |
| Arenaria eastwoodiae var. eastwoodiae | Eastwood's Matted Sandwort Eastwood's Sandwort | |
| Arenaria fendleri | Fendler's Sandwort | |
| Arenaria fendleri var. brevifolia | Fendler's Sandwort | |
| Arenaria fendleri var. fendleri | Fendler's Sandwort | |
| Arenaria fendleri var. porteri | Fendler's Sandwort Porter's Sandwort | |
| Arenaria fendleri var. tweedyi | Fendler's Sandwort Tweedy's Sandwort | |
| Arenaria franklinii | Franklin's Matted Sandwort Franklin's Sandwort Fringed Sagewort | |
| Arenaria franklinii var. franklinii | Franklin's Sandwort | |
| Arenaria franklinii var. thompsonii | Thompson's Sandwort | |
| Arenaria hookeri | Hooker's Sandwort Hooker's Matted Sandwort | |
| Arenaria hookeri ssp. desertorum | Hooker's Desert Sandwort | |
| Arenaria hookeri ssp. hookeri | Hooker's Sandwort | |
| Arenaria hookeri ssp. pinetorum | Hooker's Sandwort | |
| Arenaria humifusa | Creeping Sandwort Low Sandwort | |
| Arenaria kingii | King's Matted Sandwort King's Sandwort | |
| Arenaria kingii ssp. compacta | King's Compact Sandwort King's Smooth Sandwort | |
| Arenaria kingii ssp. kingii | King's Matted Sandwort King's Sandwort | |
| Arenaria kingii ssp. plateauensis | King's Plateau Sandwort | |
| Arenaria kingii ssp. rosea | King's Rosy Sandwort | |
| Arenaria kingii ssp. uintahensis | King's Uinta Sandwort Uinta Sandwort | |
| Arenaria lanuginosa | Spreading Sandwort | |
| Arenaria lanuginosa ssp. lanuginosa | Spreading Sandwort | |
| Arenaria lanuginosa ssp. saxosa | Spreading Sandwort | |
| Arenaria lanuginosa var. lanuginosa | Spreading Sandwort | |
| Arenaria lanuginosa var. longipedunculata | Spreading Sandwort | |
| Arenaria livermorensis | Livermore Sandwort | |
| Arenaria longipedunculata | Longstem Sandwort Low Sandwort | |
| Arenaria ludens | Trans-Pecos Sandwort | |
| Arenaria macradenia | Mojave Sandwort Shrubby Sandwort | |
| Arenaria macradenia ssp. ferrisiae | Ferris' Sandwort | |
| Arenaria macradenia ssp. macradenia | Mojave Sandwort Shrubby Sandwort | |
| Arenaria macradenia var. arcuifolia | Mojave Sandwort Forest Camp Sandwort | |
| Arenaria macradenia var. kuschei | Forest Camp Sandwort | |
| Arenaria macradenia var. macradenia | Mojave Sandwort Shrubby Sandwort | |
| Arenaria paludicola | Marsh Sandwort Swamp Sandwort | |
| Arenaria pumicola | Crater Lake Matted Sandwort Crater Lake Sandwort | |
| Arenaria stenomeres | Meadow Valley Matted Sandwort Meadow Valley Sandwort | |
| Arenaria ursina | Bear Valley Matted Sandwort Bear Valley Sandwort Big Bear Valley Sandwort | |
| Arethusa bulbosa | Dragon's Mouth Swamp Pink | |
| Argemone aenea | Golden Pricklypoppy Golden Prickly Poppy | |
| Argemone albiflora | Bluestem Pricklypoppy White Pricklypoppy White Prickly Poppy | |
| Argemone albiflora ssp. albiflora | Bluestem Pricklypoppy White Prickly Poppy | |
| Argemone albiflora ssp. texana | Texas Bluestem Pricklypoppy Bluestem Pricklypoppy White Pricklypoppy White Prickly Poppy | |
| Argemone arizonica | Arizona Prickly Poppy Arizona Pricklypoppy Roaring Springs Prickly-poppy | |
| Argemone aurantiaca | Texas Pricklypoppy Texas Prickly Poppy | |
| Argemone chisosensis | Chisos Mountain Prickly Poppy Pink Prickly Poppy | |
| Argemone corymbosa | Mojave Pricklypoppy Mojave Prickly Poppy | |
| Argemone corymbosa ssp. arenicola | Mojave Prickly Poppy Mojave Pricklypoppy | |
| Argemone corymbosa ssp. corymbosa | Leafy Prickly Poppy Mojave Prickly Poppy Mojave Pricklypoppy | |
| Argemone glauca | Beach Poppy Hawaiian Prickly Poppy Naule Pokalakala Pua Kala Smooth Pricklypoppy | |
| Argemone glauca var. decipiens | Hawaiian Prickly Poppy Naule Pua Kala Smooth Pricklypoppy | |
| Argemone glauca var. glauca | Beach Poppy Hawaiian Prickly Poppy Naule Pua Kala Smooth Pricklypoppy | |
| Argemone gracilenta | Sonoran Pricklypoppy Sonoran Prickly Poppy Sonoran Prickly-poppy | |
| Argemone hispida | Rough Pricklypoppy Rough Prickly Poppy | |
| Argemone mexicana | Mexican Prickly Poppy Mexican Prickly Poppy Yellow Prickly Poppy | |
| Argemone munita | Flatbud Pricklypoppy Flatbud Prickly Poppy | |
| Argemone munita ssp. argentea | Flatbud Pricklypoppy Prickly Poppy | |
| Argemone munita ssp. munita | Chicalote Flat-bud Prickly Poppy Flatbud Prickly Poppy Flatbud Pricklypoppy | |
| Argemone munita ssp. robusta | Flatbud Prickly Poppy Flatbud Pricklypoppy Robust Prickly-poppy | |
| Argemone munita ssp. rotundata | Flatbud Prickly Poppy Flatbud Pricklypoppy | |
| Argemone pleiacantha | Southwestern Prickly-poppy Bluestem Pricklepoppy Southwestern Prickly Poppy | |
| Argemone pleiacantha ssp. ambigua | Southwestern Prickly Poppy Southwestern Pricklypoppy | |
| Argemone pleiacantha ssp. pinnatisecta | Sacramento Prickly Poppy Southwestern Pricklypoppy | |
| Argemone pleiacantha ssp. pleiacantha | Southwestern Pricklypoppy Southwestern Prickly Poppy | |
| Argemone polyanthemos | Crested Pricklypoppy Annual Pricklepoppy Bluestem Pricklepoppy Bluestem Prickly Poppy Pricklypoppy Thistle Poppy White Prickly Poppy White Pricklypoppy | |
| Argemone sanguinea | Red Pricklypoppy Rose Prickly Poppy Red Prickly Poppy | |
| Argemone squarrosa | Hedgehog Pricklypoppy Hedgehog Prickly Poppy | |
| Argemone squarrosa ssp. glabrata | Hedgehog Pricklypoppy Hedgehog Prickly Poppy | |
| Argemone squarrosa ssp. squarrosa | Hedgehog Prickly Poppy Hedgehog Pricklypoppy | |
| Argentina anserina | Silverweed Cinquefoil Common Silverweed Silverweed Goosefoot | |
| Argentina egedii | Pacific Silverweed | |
| Argentina egedii ssp. egedii | Pacific Silverweed Beach Silverweed | |
| Argentina egedii ssp. groenlandica | Pacific Silverweed | |
| Argusia gnaphalodes | Sea Lavender Bay Lavender Sea Rosemary Beach Heliotrope | |
| Argyrochosma dealbata | Powdery False Cloak Fern Powdery Cloak Fern False Cloak Fern | |
| scientific name | common name(s) | image gallery |
