| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CAPE9 | Castilleja peirsonii Eastw. | Castilleja parviflora var. parviflora | Scrophulariaceae
|
| CAPIJ | Castilleja pilosa (S. Wats.) Rydb. ssp. jusselii (Eastw.) Munz | Castilleja pilosa var. pilosa | Scrophulariaceae
|
| CAPII | Castilleja pilosa (S. Wats.) Rydb. var. inverta (A. Nels. & J.F. Macbr.) Greenm. | Castilleja pallescens var. inverta | Scrophulariaceae
|
| CAPIL | Castilleja pilosa (S. Wats.) Rydb. var. longispica (A. Nels.) N. Holmgren | longspike Indian paintbrush | Scrophulariaceae
|
| CAPIP | Castilleja pilosa (S. Wats.) Rydb. var. pilosa | parrothead Indian paintbrush | Scrophulariaceae
|
| CAPIS | Castilleja pilosa (S. Wats.) Rydb. var. steenensis (Pennell) N. Holmgren | Steenes Indian paintbrush | Scrophulariaceae
|
| CAPI3 | Castilleja pilosa (S. Wats.) Rydb. | parrothead Indian paintbrush | Scrophulariaceae
|
| CAPI14 | Castilleja pinetorum Fern. | Castilleja applegatei ssp. pinetorum | Scrophulariaceae
|
| CAPL7 | Castilleja plagiotoma Gray | Mojave Indian paintbrush | Scrophulariaceae
|
| CAPO11 | Castilleja �porterae Cockerell | | Scrophulariaceae
|
| CAPR11 | Castilleja praeterita Heckard & Bacig. | Salmon Creek Indian paintbrush | Scrophulariaceae
|
| CAPRG | Castilleja pruinosa Fern. ssp. gleasoni (Elmer) Munz | Castilleja pruinosa | Scrophulariaceae
|
| CAPR14 | Castilleja pruinosa Fern. | frosted Indian paintbrush | Scrophulariaceae
|
| CAPS7 | Castilleja psittacina (Eastw.) Pennell | Castilleja pilosa var. pilosa | Scrophulariaceae
|
| CAPU19 | Castilleja puberula Rydb. | shortflower Indian paintbrush | Scrophulariaceae
|
| CAPU10 | Castilleja pulchella Rydb. | beautiful Indian paintbrush | Scrophulariaceae
|
| CAPUC | Castilleja purpurea (Nutt.) G. Don var. citrina (Pennell) Shinners | prairie Indian paintbrush | Scrophulariaceae
|
| CAPUL | Castilleja purpurea (Nutt.) G. Don var. lindheimeri (Gray) Shinners | Lindheimer's Indian paintbrush | Scrophulariaceae
|
| CAPUP5 | Castilleja purpurea (Nutt.) G. Don var. purpurea | downy Indian paintbrush | Scrophulariaceae
|
| CAPU11 | Castilleja purpurea (Nutt.) G. Don | downy Indian paintbrush | Scrophulariaceae
|
| CAPY7 | Castilleja pyramidalis Edwin | Castilleja applegatei ssp. martinii | Scrophulariaceae
|
| CARA7 | Castilleja raupii Pennell | Raup's Indian paintbrush | Scrophulariaceae
|
| CARE10 | Castilleja revealii N. Holmgren | Bryce Canyon Indian paintbrush | Scrophulariaceae
|
| CARHS | Castilleja rhexiifolia Rydb. var. sulphurea (Rydb.) Atwood | Castilleja sulphurea | Scrophulariaceae
|
| CARH4 | Castilleja rhexiifolia Rydb. | splitleaf Indian paintbrush | Scrophulariaceae
|
| CARI12 | Castilleja rigida Eastw. | rigid Indian paintbrush | Scrophulariaceae
|
| CARO16 | Castilleja roseana Eastw. | Castilleja applegatei ssp. martinii | Scrophulariaceae
|
| CARUL | Castilleja rubicundula (Jepson) Chuang & Heckard ssp. lithospermoides (Benth.) Chuang & Heckard | cream sacs | Scrophulariaceae
|
| CARUR2 | Castilleja rubicundula (Jepson) Chuang & Heckard ssp. rubicundula | cream sacs | Scrophulariaceae
|
| CARU20 | Castilleja rubicundula (Jepson) Chuang & Heckard | cream sacs | Scrophulariaceae
|
| CARUM2 | Castilleja rubida Piper var. monoensis (Jepson) Edwin | Castilleja pilosa var. pilosa | Scrophulariaceae
|
| CARU8 | Castilleja rubida Piper | little reddish Indian paintbrush | Scrophulariaceae
|
| CARU9 | Castilleja rupicola Piper ex Fern. | cliff Indian paintbrush | Scrophulariaceae
|
| CARU10 | Castilleja rustica Piper | Castilleja flava var. rustica | Scrophulariaceae
|
| CASA20 | Castilleja salsuginosa N. Holmgren | Monte Neva Indian paintbrush | Scrophulariaceae
|
| CASCB3 | Castilleja scabrida Eastw. var. barnebyana (Eastw.) N. Holmgren | Barneby's Indian paintbrush | Scrophulariaceae
|
| CASCS4 | Castilleja scabrida Eastw. var. scabrida | Zion Indian paintbrush | Scrophulariaceae
|
| CASC19 | Castilleja scabrida Eastw. | rough Indian paintbrush | Scrophulariaceae
|
| CASC20 | Castilleja schizotricha Greenm. | splithair Indian paintbrush | Scrophulariaceae
|
| CASE4 | Castilleja septentrionalis Lindl. | Labrador Indian paintbrush | Scrophulariaceae
|
| CASE5 | Castilleja sessiliflora Pursh | downy paintedcup | Scrophulariaceae
|
| CASP20 | Castilleja spiralis Jepson | Castilleja minor ssp. spiralis | Scrophulariaceae
|
| CAST29 | Castilleja steenensis Pennell | Castilleja pilosa var. steenensis | Scrophulariaceae
|
| CASTS2 | Castilleja stenantha Gray ssp. spiralis (Jepson) Munz | Castilleja minor ssp. spiralis | Scrophulariaceae
|
| CAST12 | Castilleja stenantha Gray | Castilleja minor ssp. spiralis | Scrophulariaceae
|
| CASUF2 | Castilleja subinclusa Greene ssp. franciscana (Pennell) Chuang & Heckard | longleaf Indian paintbrush | Scrophulariaceae
|
| CASUS7 | Castilleja subinclusa Greene ssp. subinclusa | longleaf Indian paintbrush | Scrophulariaceae
|
| CASUF3 | Castilleja subinclusa Greene var. franciscana (Pennell) Nesom | Castilleja subinclusa ssp. franciscana | Scrophulariaceae
|
| CASU10 | Castilleja subinclusa Greene | longleaf Indian paintbrush | Scrophulariaceae
|
| CASU11 | Castilleja suksdorfii Gray | Suksdorf's Indian paintbrush | Scrophulariaceae
|
| CASU12 | Castilleja sulphurea Rydb. | sulphur Indian paintbrush | Scrophulariaceae
|
| CATA3 | Castilleja taedifera Pennell | Castilleja hispida ssp. acuta | Scrophulariaceae
|
| CATE14 | Castilleja tenuiflora Benth. | Santa Catalina Indian paintbrush | Scrophulariaceae
|
| CATE26 | Castilleja tenuis (Heller) Chuang & Heckard | hairy Indian paintbrush | Scrophulariaceae
|
| CATH4 | Castilleja thompsonii Pennell | Thompson's Indian paintbrush | Scrophulariaceae
|
| CATO7 | Castilleja tortifolia Pennell | Castilleja mexicana | Scrophulariaceae
|
| CATR13 | Castilleja trainii Edwin | Castilleja linariifolia | Scrophulariaceae
|
| CAUL2 | Castilleja uliginosa Eastw. | Castilleja miniata ssp. miniata | Scrophulariaceae
|
| CAUN4 | Castilleja unalaschcensis (Cham. & Schlecht.) Malte | Alaska Indian paintbrush | Scrophulariaceae
|
| CAVI14 | Castilleja villicaulis Pennell & Ownbey | Castilleja thompsonii | Scrophulariaceae
|
| CAVI13 | Castilleja villosissima Pennell | Castilleja hyperborea | Scrophulariaceae
|
| CAVI12 | Castilleja viscida Rydb. | Castilleja applegatei ssp. pinetorum | Scrophulariaceae
|
| CAVI9 | Castilleja viscidula Gray | sticky Indian paintbrush | Scrophulariaceae
|
| CAWA4 | Castilleja wallowensis Pennell | Wallowa Indian paintbrush | Scrophulariaceae
|
| CAWH2 | Castilleja wherryana Pennell | Castilleja applegatei ssp. pinetorum | Scrophulariaceae
|
| CAWIA | Castilleja wightii Elmer ssp. anacapensis (Dunkle) Pennell | Castilleja affinis ssp. affinis | Scrophulariaceae
|
| CAWII | Castilleja wightii Elmer ssp. inflata (Pennell) Munz | Castilleja affinis ssp. affinis | Scrophulariaceae
|
| CAWIL | Castilleja wightii Elmer ssp. litoralis (Pennell) Munz | Castilleja affinis ssp. litoralis | Scrophulariaceae
|
| CAWIR | Castilleja wightii Elmer ssp. rubra Pennell | Castilleja affinis ssp. affinis | Scrophulariaceae
|
| CAWI5 | Castilleja wightii Elmer | Castilleja affinis ssp. affinis | Scrophulariaceae
|
| CAWI6 | Castilleja williamsii Pennell | Castilleja purpurea var. lindheimeri | Scrophulariaceae
|
| CAWO4 | Castilleja wootonii Standl. | Sacramento Mountain Indian paintbrush | Scrophulariaceae
|
| CAXA | Castilleja xanthotricha Pennell | yellowhair Indian paintbrush | Scrophulariaceae
|
| CAYU | Castilleja yukonis Pennell | Yukon Indian paintbrush | Scrophulariaceae
|
| CAZI | Castilleja zionis Eastw. | Castilleja scabrida var. scabrida | Scrophulariaceae
|
| CASTI2 | Castilleja Mutis ex L. f. | Indian paintbrush | Scrophulariaceae
|
| CACR12 | Casuarina cristata Miq. | Casuarina lepidophloia | Casuarinaceae
|
| CACU8 | Casuarina cunninghamiana Miq. | river sheoak | Casuarinaceae
|
| CAEQ | Casuarina equisetifolia L. | beach sheoak | Casuarinaceae
|
| CAGL11 | Casuarina glauca Sieb. ex Spreng. | gray sheoak | Casuarinaceae
|
| CALE28 | Casuarina lepidophloia F. Muell. | belah | Casuarinaceae
|
| CALI8 | Casuarina litorea L. ex Fosberg & Sachet | Casuarina equisetifolia | Casuarinaceae
|
| CASUA | Casuarina Rumph. ex L. | sheoak | Casuarinaceae
|
| CAAQU | Catabrosa aquatica (L.) Beauv. var. uniflora S.F. Gray | Catabrosa aquatica | Poaceae
|
| CAAQ3 | Catabrosa aquatica (L.) Beauv. | water whorlgrass | Poaceae
|
| CATAB | Catabrosa Beauv. | whorlgrass | Poaceae
|
| CABI8 | Catalpa bignonioides Walt. | southern catalpa | Bignoniaceae
|
| CACA58 | Catalpa catalpa (L.) Karst. | Catalpa bignonioides | Bignoniaceae
|
| CAFA6 | Catalpa fargesii Bureau | | Bignoniaceae
|
| CALO8 | Catalpa longissima (Jacq.) Dum.-Cours. | Haitian catalpa | Bignoniaceae
|
| CAOV5 | Catalpa ovata G. Don | Chinese catalpa | Bignoniaceae
|
| CASP8 | Catalpa speciosa (Warder) Warder ex Engelm. | northern catalpa | Bignoniaceae
|
| CATAL | Catalpa Scop. | catalpa | Bignoniaceae
|
| CARI2 | Catapodium rigidum (L.) C.E. Hubbard ex Dony | Desmazeria rigida | Poaceae
|
| CAAC11 | Catapyrenium acarosporoides (Zahlbr.) J. W. Thomson | earth lichen | Verrucariaceae
|
| CAAN30 | Catapyrenium andicola Breuss | earth lichen | Verrucariaceae
|
| CACA69 | Catapyrenium caeruleopulvinum J. W. Thomson | earth lichen | Verrucariaceae
|
| CACH37 | Catapyrenium chilense (Rasanen) Breuss | earth lichen | Verrucariaceae
|
| CACI13 | Catapyrenium cinereum (Pers.) Korber | earth lichen | Verrucariaceae
|
| CACO65 | Catapyrenium compactum (A. Massal.) R. Sant. | compact earth lichen | Verrucariaceae
|
| CACO78 | Catapyrenium congestum Breuss & McCune | earth lichen | Verrucariaceae
|