Complete list of species
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| scientific name | common name(s) | image gallery |
| Arabis pendulina | Nodding Rock Cress Rabbit Ear Rockcress | |
| Arabis pendulina var. pendulina | Nodding Rock Cress Rabbit Ear Rockcress | |
| Arabis pendulina var. russeola | Russeola Rock Cress Russeola Rockcress | |
| Arabis perennans | Perennial Rockcress Perennial Rock Cress | |
| Arabis perstellata | Braun's Rock Cress Braun's Rockcress Large False Rockcress | |
| Arabis petiolaris | Brazos Rockcress Rock-cress Brazos Rock-cress | |
| Arabis pinzliae | Boundary Peak Rockcress Pinzl's Rock Cress | |
| Arabis platysperma | Pioneer Rock Cress Pioneer Rockcress | |
| Arabis platysperma var. howellii | Howell's Pioneer Rockcress Howell's Rock Cress | |
| Arabis platysperma var. platysperma | Pioneer Rock Cress Pioneer Rockcress | |
| Arabis puberula | Blue Mountain Rockcress Silver Rock Cress Silver Rockcress | |
| Arabis pulchra | Beautiful Rockcress Beauty Rock Cress | |
| Arabis pulchra var. duchesnensis | Duchesne Rock Cress Duchesne Rockcress | |
| Arabis pulchra var. gracilis | Beautiful Rockcress Bigfoot Hybrid Rockcress Desert Rock Cress | |
| Arabis pulchra var. munciensis | Munci's Rock Cress Muncy Rockcress | |
| Arabis pulchra var. pallens | Beautiful Rockcress Desert Rock Cress Pale Rockcress | |
| Arabis pulchra var. pulchra | Beautiful Rockcress Beauty Rock Cress | |
| Arabis pusilla | Fremont County Rock Cress Fremont County Rockcress | |
| Arabis pygmaea | Tulare County Rock Cress Tulare County Rockcress | |
| Arabis rectissima | Bristlyleaf Rock Cress Bristlyleaf Rockcress | |
| Arabis rectissima var. rectissima | Bristlyleaf Rock Cress Bristlyleaf Rockcress | |
| Arabis rectissima var. simulans | Bristlyleaf Rock Cress Bristlyleaf Rockcress | |
| Arabis repanda | Repand's Rock Cress Yosemite Rockcress | |
| Arabis repanda var. greenei | Greene's Rock Cress Greene's Rockcress Yosemite Rockcress | |
| Arabis repanda var. repanda | Repand's Rock Cress Yosemite Rockcress | |
| Arabis rigidissima | Trinity Mountain Rock Cress Trinity Mountain Rockcress | |
| Arabis rigidissima var. demota | Trinity Mountain Rock Cress Trinity Mountain Rockcress | |
| Arabis rigidissima var. rigidissima | Trinity Mountain Rock Cress Trinity Mountain Rockcress | |
| Arabis rollei | Klamath River Rockcress Rolle's Rock Cress | |
| Arabis schistacea | Divided Rock Cress Divided Rockcress | |
| Arabis selbyi | Selby's Rock Cress Selby's Rockcress | |
| Arabis serotina | Shale Barren Rock Cress Shale Barren Rock-cress Shale Barren Rockcress | |
| Arabis shockleyi | Shockley's Rock Cress Shockley's Rockcress | |
| Arabis shortii | Short's False Rockcress Short's Rock Cress Short's Rockcress | |
| Arabis sparsiflora | Sicklepod Rockcress | |
| Arabis sparsiflora var. arcuata | Arching Rock Cress Elegant Rockcress | |
| Arabis sparsiflora var. atrorubens | Elegant Rock Cress Elegant Rockcress | |
| Arabis sparsiflora var. californica | California Rock Cress California Rockcress | |
| Arabis sparsiflora var. columbiana | Columbian Rockcress Columbian Rockcress Hairystem Rock Cress | |
| Arabis sparsiflora var. sparsiflora | Sicklepod Rock Cress Sicklepod Rockcress | |
| Arabis sparsiflora var. subvillosa | Hairystem Rock Cress Hairystem Rockcress | |
| Arabis subpinnatifida | Klamath Rock Cress Klamath Rockcress | |
| Arabis suffrutescens | Purple Woody Rockcress Woody Rock Cress Woody Rockcress | |
| Arabis suffrutescens var. horizontalis | Horizontal Woody Rock Cress Horizontal Woody Rockcress | |
| Arabis suffrutescens var. suffrutescens | Purple Woody Rockcress Woody Rock Cress Woody Rockcress | |
| Arabis tiehmii | Carson Range Rockcress Tiehm's Rock Cress | |
| Arabis tricornuta | Rincon Mountain Rock Cress Rincon Mountain Rockcress | |
| Arabis williamsii | Wind River Rock Cress Wind River Rockcress | |
| Arabis williamsii var. saximontana | Cross Mountain Rock Cress Cross Mountain Rockcress | |
| Arabis williamsii var. williamsii | Wind River Rock Cress Wind River Rockcress | |
| Arabis ×divaricarpa | Spreadingpod Rockcress | |
| Arachniodes insularis | Santa Cruz Island Hollyfern | |
| Aralia californica | California Spikenard | |
| Aralia hispida | Bristly Sarsaparilla Pigeonberry | |
| Aralia humilis | Arizona Spikenard Spikenard | |
| Aralia nudicaulis | Wild Sarsaparilla | |
| Aralia racemosa | American Spikenard | |
| Aralia racemosa ssp. bicrenata | American Spikenard Spikenard | |
| Aralia racemosa ssp. racemosa | American Spikenard | |
| Aralia spinosa | Devil's Walking Stick Hercules Club Angelica Tree Pigeon Tree Shotbush Prickly Elder Prickly Ash | |
| Arbutus arizonica | Arizona Madrone | |
| Arbutus menziesii | Pacific Madrone Oregon Laurel Laurelwood | |
| Arbutus xalapensis | Texas Madrone Madrone Texas Arbutus Manzanita Xoxocote Amazaquitl | |
| Arceuthobium abietinum | Fir Dwarf Mistletoe Western Dwarf Mistletoe White Fir Dwarf-mistletoe | |
| Arceuthobium abietinum ssp. abietinum | Fir Dwarf Mistletoe Western Dwarf Mistletoe Western Dwarf-mistletoe | |
| Arceuthobium abietinum ssp. wiensii | Fir Dwarf Mistletoe Fir Dwarf-mistletoe Klamath Fir Dwarf Mistletoe Wiens' Dwarf Mistletoe | |
| Arceuthobium americanum | American Dwarf Mistletoe Lodgepole Dwarf Mistletoe Lodgepole Pine Dwarf Mistletoe Lodgepole Pine Dwarf-mistletoe | |
| Arceuthobium apachecum | Apache Dwarf Mistletoe Apache Dwarf-mistletoe | |
| Arceuthobium blumeri | Blumer's Dwarf Mistletoe Southwestern White Pine Dwarf Mistletoe Southwestern White Pine Dwarf-mistletoe White Pine Dwarf Mistletoe | |
| Arceuthobium californicum | Sugar Pine Dwarf Mistletoe Sugar Pine Dwarf-mistletoe | |
| Arceuthobium campylopodum | Western Dwarf Mistletoe | |
| Arceuthobium cyanocarpum | Limber Pine Dwarf Mistletoe | |
| Arceuthobium divaricatum | Pinyon Dwarf Mistletoe Pinyon Dwarf-mistletoe | |
| Arceuthobium douglasii | Douglas Fir Dwarf Mistletoe Douglas-fir Dwarf Mistletoe | |
| Arceuthobium gillii | Chihuahua Pine Dwarf Mistletoe Huachuca Mountain Dwarf Mistletoe Huachuca Mountain Dwarf-mistletoe | |
| Arceuthobium laricis | Larch Dwarf Mistletoe Larch Dwarf-mistletoe | |
| Arceuthobium littorum | Coastal Dwarf Mistletoe Coastal Dwarf-mistletoe | |
| Arceuthobium microcarpum | Western Spruce Dwarf Mistletoe Western Spruce Dwarf-mistletoe | |
| Arceuthobium monticola | Western White Pine Dwarf Mistletoe Western White Pine Dwarf-mistletoe | |
| Arceuthobium occidentale | Digger Pine Dwarf Mistletoe Digger Pine Dwarf-mistletoe Gray Pine Dwarf Mistletoe | |
| Arceuthobium pusillum | Eastern Dwarf Mistletoe | |
| Arceuthobium siskiyouense | Knobcone Pine Dwarf Mistletoe Knobcone Pine Dwarf-mistletoe | |
| Arceuthobium tsugense | Hemlock Dwarf Mistletoe Hemlock Dwarf-mistletoe | |
| Arceuthobium tsugense ssp. mertensianae | Hemlock Dwarf Mistletoe Hemlock Dwarf-mistletoe | |
| Arceuthobium tsugense ssp. tsugense | Hemlock Dwarf Mistletoe Hemlock Dwarf-mistletoe | |
| Arceuthobium vaginatum | Pineland Dwarf Mistletoe Pineland Dwarf-mistletoe Southwestern Dwarf Mistletoe | |
| Arceuthobium vaginatum ssp. cryptopodum | Pineland Dwarf Mistletoe Pineland Dwarf-mistletoe Southwestern Dwarf Mistletoe | |
| Arctagrostis latifolia | Wideleaf Polargrass Broad-leaf Arctic-bent Polar Grass | |
| Arctagrostis latifolia ssp. arundinacea | Reed Polargrass Wideleaf Polargrass | |
| Arctagrostis latifolia ssp. latifolia | Wide-leaved Polargrass Wideleaf Polargrass | |
| ×Arctodupontia scleroclada | Actodupontia | |
| Arctomecon californica | California Bear-poppy Yellow Desert-poppy Yellow Desert Poppy | |
| Arctomecon humilis | Common Bear-poppy Little Desert-poppy Little Desert Poppy | |
| Arctomecon merriamii | Desert Bear-poppy Great Desert-poppy Great Bearclaw-poppy Great Desert Poppy | |
| Arctophila fulva | Pendant Grass Pendantgrass | |
| Arctostaphylos alpina | Alpine Bearberry | |
| Arctostaphylos alpina var. alpina | Alpine Bearberry | |
| Arctostaphylos andersonii | Heartleaf Manzanita Santa Cruz Island Manzanita Santa Cruz Manzanita | |
| Arctostaphylos auriculata | Mount Diablo Manzanita Mt. Diablo Manzanita | |
| Arctostaphylos bakeri | Baker's Manzanita | |
| scientific name | common name(s) | image gallery |
