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| scientific name | common name(s) | image gallery |
| Balsamorhiza hookeri | Hooker's balsamroot Hairy balsamroot | |
| Balsamorhiza incana | Hoary balsamroot | |
| Baptisia lanceolata | Gopherweed Pineland baptisia | |
| Balsamorhiza macrolepis | California balsamroot | |
| Baileya multiradiata | Desert marigold Showy desert marigold Paper daisy Desert baileya | |
| Baptisia nuttalliana | Nuttall's wild indigo | |
| Baccharis pilularis | Coyotebrush Chaparral broom Coyote bush | |
| Balsamorhiza sagittata | Arrowleaf balsamroot Arrow-leaf balsamroot | |
| Baccharis salicifolia | Mule's fat Seep willow | |
| Baptisia sphaerocarpa | Bush pea Green wild indigo Yellow wild indigo Yellow wisteria | |
| Baptisia tinctoria | Horseflyweed Yellow Wild Indigo | |
| Bidens alba | Common Beggarticks Shepherd's Needles Spanish Needles Butterfly Needles Hairy Beggarticks Romerillo | |
| Bidens alba var. radiata | Romerillo | |
| Bidens aristosa | Bearded beggarticks Tickseed sunflower | |
| Bidens beckii | Beck's watermarigold | |
| Bidens bigelovii | Bigelow's beggarticks | |
| Bidens cernua | Nodding beggartick Bur marigold Nodding beggarticks Nodding bur marigold Nodding burmarigold Nodding burr-marigold Sticktight | |
| Bidens coronata | Crowned beggarticks | |
| Bidens connata | Purplestem beggarticks | |
| Bidens discoidea | Small beggarticks | |
| Bidens eatonii | Eaton's beggarticks | |
| Bidens frondosa | Devil's beggartick Spanish needles | |
| Bidens heterodoxa | Connecticut beggarticks | |
| Bidens hyperborea | Estuary beggarticks | |
| Bidens hyperborea var. hyperborea | Estuary beggarticks | |
| Bidens laevis | Smooth beggartick Smooth bidens Smooth bur marigold Larger bur marigold | |
| Bidens leptocephala | Fewflower beggarticks | |
| Bidens vulgata | Big devils beggartick | |
| Blephilia ciliata | Downy pagoda plant Sunny woodmint Ohio horsemint | |
| Castilleja affinis | Coast Indian paintbrush | |
| Campanulastrum americanum | American bellflower American-bellflower Tall bellflower | |
| Calandrinia ciliata | Fringed redmaids Redmaids | |
| Callirhoe involucrata | Winecup Purple poppy mallow | |
| Camassia leichtlinii | Large camas Leichtlin's camas | |
| Camassia quamash | Small camas Common camass Swamp sego | |
| Ceanothus americanus | New Jersey tea Redroot | |
| Centaurea americana | American star-thistle Basket-Flower Star thistle Shaving brush American basket-flower | |
| Ceanothus arboreus | Feltleaf Feltleaf ceanothus Island ceanothus Island mountain lilac | |
| Cercis canadensis | Eastern redbud Redbud | |
| Cercis canadensis var. canadensis | Eastern redbud | |
| Cercis canadensis var. mexicana | Mexican redbud | |
| Cercis canadensis var. texensis | Texas redbud | |
| Ceanothus cordulatus | Mountain whitethorn Snow bush Whitethorn ceanothus | |
| Ceanothus cuneatus | Buckbrush | |
| Ceanothus fendleri | Fendler ceanothus Fendler's ceanothus | |
| Ceanothus gloriosus var. exaltatus | Point Reyes ceanothus Glory brush | |
| Ceanothus gloriosus var. gloriosus | Point Reyes ceanothus Glory mat | |
| Ceanothus greggii | Desert ceanothus | |
| Ceanothus griseus | Carmel ceanothus Carmel creeper Yankee Point ceanothus | |
| Ceanothus greggii var. vestitus | Mojave ceanothus Desert ceanothus | |
| Ceanothus herbaceus | Redroot Prairie redroot Jersey tea Inland Ceanothus Fuzzy Ceanothus | |
| Ceanothus hearstiorum | Hearst Ranch buckbrush | |
| Ceanothus impressus | Santa Barbara ceanothus Santa Barbara buckbrush | |
| Ceanothus integerrimus | Deerbrush | |
| Ceanothus leucodermis | Chaparral whitethorn Jackbrush | |
| Ceanothus maritimus | Maritime ceanothus Bluff california lilac | |
| Ceanothus megacarpus | Big-pod buckbrush Big-pod ceanothus Bigpod ceanothus | |
| Cephalanthus occidentalis | Common buttonbush Buttonbush Button willow | |
| Cercis orbiculata | California redbud Western redbud Arizona redbud Pata de vaca | |
| Ceanothus parvifolius | Littleleaf ceanothus | |
| Ceanothus purpureus | Hollyleaf ceanothus | |
| Ceanothus sanguineus | Oregon Teatree Redstem ceanothus Wild lilac | |
| Ceanothus spinosus | Redheart Greenbark ceanothus Red-heart mountain lilac | |
| Ceanothus thyrsiflorus | Blue blossom Blueblossom Bluebrush | |
| Ceanothus tomentosus | Woolyleaf ceanothus Woolly-leaf mountain lilac Ramona lilac | |
| Ceanothus velutinus | Snowbrush Snowbrush ceanothus Tobacco-brush Mountain balm Buckbush | |
| Chamerion angustifolium | Fireweed Willow herb | |
| Chamaecrista fasciculata | Partridge pea Sleepingplant Sensitive plant | |
| Chamaecrista fasciculata var. fasciculata | Partridge pea Showy Partridge-pea Beeflower | |
| Chamerion latifolium | Broad-leaf fireweed Dwarf fireweed | |
| Cirsium arizonicum | Arizona thistle | |
| Cirsium brevistylum | Clustered thistle Indian thistle Short-style thistle | |
| Cirsium canescens | Prairie thistle | |
| Cirsium cymosum | Peregrine thistle | |
| Cirsium discolor | Field thistle | |
| Cirsium drummondii | Dwarf thistle | |
| Cirsium edule | Edible thistle | |
| Cirsium engelmannii | Engelmann's thistle | |
| Cirsium flodmanii | Flodman's thistle | |
| Cirsium foliosum | Elk thistle | |
| Cirsium horridulum | Yellow thistle | |
| Cirsium mohavense | Mojave thistle | |
| Cirsium muticum | Swamp thistle | |
| Cirsium neomexicanum | New Mexico thistle Utah thistle | |
| Cirsium occidentale | Cobwebby thistle | |
| Cirsium ochrocentrum | Yellowspine thistle | |
| Cirsium occidentale var. candidissimum | Snowy thistle | |
| Cirsium occidentale var. occidentale | Cobwebby thistle | |
| Cirsium peckii | Steen Mountain thistle Ghost thistle | |
| Cirsium pitcheri | Sand dune thistle | |
| Cirsium pumilum | Pasture thistle | |
| Cirsium scariosum | Meadow thistle | |
| Cirsium texanum | Texas thistle | |
| Cirsium turneri | Cliff thistle | |
| Cirsium undulatum | Wavyleaf thistle Plumed Thistle | |
| Cirsium wheeleri | Wheeler's thistle | |
| Clethra alnifolia | Coastal sweet pepperbush Clethra Summer sweet | |
| Clarkia amoena | Farewell to spring Farewell-to-spring Herald-of-summer | |
| Clarkia biloba | Twolobe clarkia | |
| Clarkia concinna | Red ribbons Redribbons | |
| scientific name | common name(s) | image gallery |