| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| SILI | Sida lindheimeri Engelm. & Gray | showy fanpetals | Malvaceae
|
| SILI6 | Sida linifolia Cav. | flaxleaf fanpetals | Malvaceae
|
| SILO | Sida longipes Gray | stockflower fanpetals | Malvaceae
|
| SIME2 | Sida meyeniana Walp. | Sida fallax | Malvaceae
|
| SINE4 | Sida nelsonii St. John | Sida fallax | Malvaceae
|
| SINE | Sida neomexicana Gray | New Mexico fanpetals | Malvaceae
|
| SIPA10 | Sida paniculata L. | Sidastrum paniculatum | Malvaceae
|
| SIPH3 | Sida physaloides Presl | Krapovickasia physaloides | Malvaceae
|
| SIPH2 | Sida physocalyx Gray | Rhynchosida physocalyx | Malvaceae
|
| SIPR2 | Sida procumbens Sw. | Sida abutifolia | Malvaceae
|
| SIPY | Sida pyramidata Desportes ex Cav. | Allosidastrum pyramidatum | Malvaceae
|
| SIRE7 | Sida repens Domb. ex Cav. | Javanese fanpetals | Malvaceae
|
| SIRH | Sida rhombifolia L. | cuban jute | Malvaceae
|
| SIRU2 | Sida rubromarginata Nash | Sida elliottii | Malvaceae
|
| SISA8 | Sida sagittifolia (Gray) Rydb. | Malvella sagittifolia | Malvaceae
|
| SISA5 | Sida salviifolia K. Presl | escoba parada | Malvaceae
|
| SISA10 | Sida santaremensis Monteiro | moth fanpetals | Malvaceae
|
| SISE8 | Sida setifera K. Presl | Sida aggregata | Malvaceae
|
| SISPA2 | Sida spinosa L. var. angustifolia auct. p.p. non (Lam.) Griseb. | Sida spinosa | Malvaceae
|
| SISP | Sida spinosa L. | prickly fanpetals | Malvaceae
|
| SIST5 | Sida stipularis Cav. | stipule fanpetals | Malvaceae
|
| SISU4 | Sida supina L'H�r. | Sida abutifolia | Malvaceae
|
| SITE6 | Sida texana (Torr. & Gray) Small | Sida lindheimeri | Malvaceae
|
| SITR | Sida tragiifolia Gray | earleaf fanpetals | Malvaceae
|
| SIUR2 | Sida urens L. | tropical fanpetals | Malvaceae
|
| SIVI6 | Sida villosa P. Mill. | Melochia spicata | Sterculiaceae
|
| SIDA | Sida L. | fanpetals | Malvaceae
|
| SIAS4 | Sidalcea asprella Greene | Sidalcea malviflora ssp. asprella | Malvaceae
|
| SICAC3 | Sidalcea calycosa M.E. Jones ssp. calycosa | annual checkerbloom | Malvaceae
|
| SICAR | Sidalcea calycosa M.E. Jones ssp. rhizomata (Jepson) Munz | Pt. Reyes checkerbloom | Malvaceae
|
| SICA | Sidalcea calycosa M.E. Jones | annual checkerbloom | Malvaceae
|
| SICA2 | Sidalcea campestris Greene | meadow checkerbloom | Malvaceae
|
| SICAC4 | Sidalcea candida Gray var. candida | white checkerbloom | Malvaceae
|
| SICAG3 | Sidalcea candida Gray var. glabrata C.L. Hitchc. | white checkerbloom | Malvaceae
|
| SICA3 | Sidalcea candida Gray | white checkerbloom | Malvaceae
|
| SICO2 | Sidalcea covillei Greene | Owens Valley sidalcea | Malvaceae
|
| SICUP | Sidalcea cusickii Piper ssp. purpurea C.L. Hitchc. | Sidalcea cusickii | Malvaceae
|
| SICU | Sidalcea cusickii Piper | Cusick's checkerbloom | Malvaceae
|
| SIDI | Sidalcea diploscypha (Torr. & Gray) Gray | fringed checkerbloom | Malvaceae
|
| SIEX3 | Sidalcea eximia Greene | Sidalcea oregana ssp. eximia | Malvaceae
|
| SIGL2 | Sidalcea glaucescens Greene | waxy checkerbloom | Malvaceae
|
| SIHA | Sidalcea hartwegii Gray ex Benth. | valley checkerbloom | Malvaceae
|
| SIHE4 | Sidalcea hendersonii S. Wats. | Henderson's checkerbloom | Malvaceae
|
| SIHIA | Sidalcea hickmanii Greene ssp. anomala C.L. Hitchc. | Cuesta Pass checker | Malvaceae
|
| SIHIH | Sidalcea hickmanii Greene ssp. hickmanii | Hickman's checkerbloom | Malvaceae
|
| SIHIP | Sidalcea hickmanii Greene ssp. parishii (B.L. Robins.) C.L. Hitchc. | Parish's checker | Malvaceae
|
| SIHIV | Sidalcea hickmanii Greene ssp. viridis C.L. Hitchc. | Marin checkerbloom | Malvaceae
|
| SIHIP2 | Sidalcea hickmanii Greene var. parishii B.L. Robins. | Sidalcea hickmanii ssp. parishii | Malvaceae
|
| SIHI | Sidalcea hickmanii Greene | chaparral checkerbloom | Malvaceae
|
| SIHI2 | Sidalcea hirsuta Gray ex Benth. | hairy checkerbloom | Malvaceae
|
| SIHI3 | Sidalcea hirtipes C.L. Hitchc. | bristlystem checkerbloom | Malvaceae
|
| SIKE | Sidalcea keckii Wiggins | Keck's checkerbloom | Malvaceae
|
| SIMA | Sidalcea malachroides (Hook. & Arn.) Gray | mapleleaf checkerbloom | Malvaceae
|
| SIMAA | Sidalcea malviflora (DC.) Gray ex Benth. ssp. asprella (Greene) C.L. Hitchc. | dwarf checkerbloom | Malvaceae
|
| SIMAC | Sidalcea malviflora (DC.) Gray ex Benth. ssp. californica (Nutt. ex Torr. & Gray) C.L. Hitchc. | California checkerbloom | Malvaceae
|
| SIMAC2 | Sidalcea malviflora (DC.) Gray ex Benth. ssp. celata (Jepson) C.L. Hitchc. | dwarf checkerbloom | Malvaceae
|
| SIMAD | Sidalcea malviflora (DC.) Gray ex Benth. ssp. dolosa C.L. Hitchc. | dwarf checkerbloom | Malvaceae
|
| SIMAE | Sidalcea malviflora (DC.) Gray ex Benth. ssp. elegans (Greene) C.L. Hitchc. | dwarf checkerbloom | Malvaceae
|
| SIMAL2 | Sidalcea malviflora (DC.) Gray ex Benth. ssp. laciniata C.L. Hitchc. var. laciniata | dwarf checkerbloom | Malvaceae
|
| SIMAS2 | Sidalcea malviflora (DC.) Gray ex Benth. ssp. laciniata C.L. Hitchc. var. sancta C.L. Hitchc. | dwarf checkerbloom | Malvaceae
|
| SIMAL | Sidalcea malviflora (DC.) Gray ex Benth. ssp. laciniata C.L. Hitchc. | dwarf checkerbloom | Malvaceae
|
| SIMAM | Sidalcea malviflora (DC.) Gray ex Benth. ssp. malviflora | dwarf checkerbloom | Malvaceae
|
| SIMAN | Sidalcea malviflora (DC.) Gray ex Benth. ssp. nana (Jepson) C.L. Hitchc. | dwarf checkerbloom | Malvaceae
|
| SIMAP | Sidalcea malviflora (DC.) Gray ex Benth. ssp. patula C.L. Hitchc. | Siskiyou checkerbloom | Malvaceae
|
| SIMAP2 | Sidalcea malviflora (DC.) Gray ex Benth. ssp. purpurea C.L. Hitchc. | dwarf checkerbloom | Malvaceae
|
| SIMAR2 | Sidalcea malviflora (DC.) Gray ex Benth. ssp. rostrata (Eastw.) Wiggins | dwarf checkerbloom | Malvaceae
|
| SIMAH | Sidalcea malviflora (DC.) Gray ex Benth. ssp. sparsifolia C.L. Hitchc. var. hirsuta C.L. Hitchc. | dwarf checkerbloom | Malvaceae
|
| SIMAS3 | Sidalcea malviflora (DC.) Gray ex Benth. ssp. sparsifolia C.L. Hitchc. var. sparsifolia | dwarf checkerbloom | Malvaceae
|
| SIMAS4 | Sidalcea malviflora (DC.) Gray ex Benth. ssp. sparsifolia C.L. Hitchc. var. stellata C.L. Hitchc. | dwarf checkerbloom | Malvaceae
|
| SIMAU | Sidalcea malviflora (DC.) Gray ex Benth. ssp. sparsifolia C.L. Hitchc. var. uliginosa C.L. Hitchc. | dwarf checkerbloom | Malvaceae
|
| SIMAS | Sidalcea malviflora (DC.) Gray ex Benth. ssp. sparsifolia C.L. Hitchc. | dwarf checkerbloom | Malvaceae
|
| SIMAV | Sidalcea malviflora (DC.) Gray ex Benth. ssp. virgata (T.J. Howell) C.L. Hitchc. | dwarf checkerbloom | Malvaceae
|
| SIMAC3 | Sidalcea malviflora (DC.) Gray ex Benth. var. californica (Nutt. ex Torr. & Gray) Jepson | Sidalcea malviflora ssp. californica | Malvaceae
|
| SIMAC4 | Sidalcea malviflora (DC.) Gray ex Benth. var. celata Jepson | Sidalcea malviflora ssp. celata | Malvaceae
|
| SIMAV2 | Sidalcea malviflora (DC.) Gray ex Benth. var. virgata (T.J. Howell) Dimling | Sidalcea malviflora ssp. virgata | Malvaceae
|
| SIMA2 | Sidalcea malviflora (DC.) Gray ex Benth. | dwarf checkerbloom | Malvaceae
|
| SIMU | Sidalcea multifida Greene | cutleaf checkerbloom | Malvaceae
|
| SINE2 | Sidalcea nelsoniana Piper | Nelson's checkerbloom | Malvaceae
|
| SINEC2 | Sidalcea neomexicana Gray ssp. crenulata (A. Nels.) C.L. Hitchc. | salt spring checkerbloom | Malvaceae
|
| SINEN | Sidalcea neomexicana Gray ssp. neomexicana | salt spring checkerbloom | Malvaceae
|
| SINET | Sidalcea neomexicana Gray ssp. thurberi (B.L. Robins. ex Gray) C.L. Hitchc. | Thurber's checkerbloom | Malvaceae
|
| SINEC3 | Sidalcea neomexicana Gray var. covillei (Greene) Roush | Sidalcea covillei | Malvaceae
|
| SINEC | Sidalcea neomexicana Gray var. crenulata (A. Nels.) C.L. Hitchc. | Sidalcea neomexicana ssp. crenulata | Malvaceae
|
| SINEP | Sidalcea neomexicana Gray var. parviflora Greene | Sidalcea neomexicana ssp. thurberi | Malvaceae
|
| SINE3 | Sidalcea neomexicana Gray | salt spring checkerbloom | Malvaceae
|
| SIORE | Sidalcea oregana (Nutt. ex Torr. & Gray) Gray ssp. eximia (Greene) C.L. Hitchc. | coast checkerbloom | Malvaceae
|
| SIORH | Sidalcea oregana (Nutt. ex Torr. & Gray) Gray ssp. hydrophila (Heller) C.L. Hitchc. | Oregon checkerbloom | Malvaceae
|
| SIORC2 | Sidalcea oregana (Nutt. ex Torr. & Gray) Gray ssp. oregana var. calva C.L. Hitchc. | Oregon checkerbloom | Malvaceae
|
| SIORM2 | Sidalcea oregana (Nutt. ex Torr. & Gray) Gray ssp. oregana var. maxima (M.E. Peck) C.L. Hitchc. | Oregon checkerbloom | Malvaceae
|
| SIORN2 | Sidalcea oregana (Nutt. ex Torr. & Gray) Gray ssp. oregana var. nevadensis C.L. Hitchc. | Oregon checkerbloom | Malvaceae
|
| SIORO2 | Sidalcea oregana (Nutt. ex Torr. & Gray) Gray ssp. oregana var. oregana | Oregon checkerbloom | Malvaceae
|
| SIORP2 | Sidalcea oregana (Nutt. ex Torr. & Gray) Gray ssp. oregana var. procera C.L. Hitchc. | Oregon checkerbloom | Malvaceae
|
| SIORO | Sidalcea oregana (Nutt. ex Torr. & Gray) Gray ssp. oregana | Oregon checkerbloom | Malvaceae
|
| SIORS | Sidalcea oregana (Nutt. ex Torr. & Gray) Gray ssp. spicata (Regel) C.L. Hitchc. | Oregon checkerbloom | Malvaceae
|
| SIORV | Sidalcea oregana (Nutt. ex Torr. & Gray) Gray ssp. valida (Greene) C.L. Hitchc. | Kenwood Marsh checkerbloom | Malvaceae
|
| SIORC3 | Sidalcea oregana (Nutt. ex Torr. & Gray) Gray var. cusickii (Piper) Roush | Sidalcea cusickii | Malvaceae
|
| SIORS2 | Sidalcea oregana (Nutt. ex Torr. & Gray) Gray var. spicata (Regel) Jepson | Sidalcea oregana ssp. spicata | Malvaceae
|
| SIOR | Sidalcea oregana (Nutt. ex Torr. & Gray) Gray | Oregon checkerbloom | Malvaceae
|
| SIPE4 | Sidalcea pedata Gray | birdfoot checkerbloom | Malvaceae
|
| SIRA | Sidalcea ranunculacea Greene | marsh checkerbloom | Malvaceae
|
| SIREN | Sidalcea reptans Greene var. nana Jepson | Sidalcea malviflora ssp. nana | Malvaceae
|