| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| ERSA12 | Eriogonum sarothriforme Gandog. | Eriogonum lonchophyllum var. lonchophyllum | Polygonaceae
|
| ERSA10 | Eriogonum saurinum Reveal | Eriogonum lonchophyllum var. saurinum | Polygonaceae
|
| ERSA6 | Eriogonum saxatile S. Wats. | hoary buckwheat | Polygonaceae
|
| ERSC4 | Eriogonum scabrellum Reveal | Westwater buckwheat | Polygonaceae
|
| ERSC9 | Eriogonum scapigerum Eastw. | Eriogonum nudum var. scapigerum | Polygonaceae
|
| ERSC8 | Eriogonum scoparium Small | Eriogonum lonchophyllum var. lonchophyllum | Polygonaceae
|
| ERSC5 | Eriogonum scopulorum Reveal | cliff buckwheat | Polygonaceae
|
| ERSE7 | Eriogonum sessile S. Stokes ex M.E. Jones | Eriogonum wetherillii | Polygonaceae
|
| ERSHC | Eriogonum shockleyi S. Wats. ssp. candidum (M.E. Jones) S. Stokes | Eriogonum shockleyi var. shockleyi | Polygonaceae
|
| ERSHL2 | Eriogonum shockleyi S. Wats. ssp. longilobum (M.E. Jones) S. Stokes | Eriogonum shockleyi var. shockleyi | Polygonaceae
|
| ERSHL | Eriogonum shockleyi S. Wats. var. longilobum (M.E. Jones) Reveal | Eriogonum shockleyi var. shockleyi | Polygonaceae
|
| ERSHP | Eriogonum shockleyi S. Wats. var. packardiae Reveal | Packard's buckwheat | Polygonaceae
|
| ERSHS | Eriogonum shockleyi S. Wats. var. shockleyi | Shockley's buckwheat | Polygonaceae
|
| ERSH | Eriogonum shockleyi S. Wats. | Shockley's buckwheat | Polygonaceae
|
| ERSI8 | Eriogonum simpsonii Benth. | Eriogonum microthecum var. simpsonii | Polygonaceae
|
| ERSI5 | Eriogonum siskiyouense Small | Siskiyou buckwheat | Polygonaceae
|
| ERSM | Eriogonum smithii Reveal | flat-top buckwheat | Polygonaceae
|
| ERSO2 | Eriogonum soredium Reveal | Frisco buckwheat | Polygonaceae
|
| ERSP12 | Eriogonum spathuiforme Rydb. | Eriogonum ostlundii | Polygonaceae
|
| ERSPS7 | Eriogonum spathulatum Gray ssp. spathuiforme (Rydb.) S. Stokes | Eriogonum ostlundii | Polygonaceae
|
| ERSPN | Eriogonum spathulatum Gray var. natum (Reveal) Welsh | Eriogonum natum | Polygonaceae
|
| ERSPP2 | Eriogonum spathulatum Gray var. panguicense (M.E. Jones) S. Stokes | Eriogonum panguicense var. panguicense | Polygonaceae
|
| ERSP5 | Eriogonum spathulatum Gray | spoonleaf buckwheat | Polygonaceae
|
| ERSPR2 | Eriogonum spergulinum Gray ssp. reddingianum (M.E. Jones) Munz ex Reveal | Eriogonum spergulinum var. reddingianum | Polygonaceae
|
| ERSPP | Eriogonum spergulinum Gray var. pratense (S. Stokes) J.T. Howell | spurry buckwheat | Polygonaceae
|
| ERSPR | Eriogonum spergulinum Gray var. reddingianum (M.E. Jones) J.T. Howell | Redding buckwheat | Polygonaceae
|
| ERSPS3 | Eriogonum spergulinum Gray var. spergulinum | spurry buckwheat | Polygonaceae
|
| ERSP6 | Eriogonum spergulinum Gray | spurry buckwheat | Polygonaceae
|
| ERSPB | Eriogonum sphaerocephalum Dougl. ex Benth. var. brevifolium S. Stokes ex M.E. Jones | Eriogonum sphaerocephalum var. sphaerocephalum | Polygonaceae
|
| ERSPF | Eriogonum sphaerocephalum Dougl. ex Benth. var. fasciculifolium (A. Nels.) S. Stokes | rock buckwheat | Polygonaceae
|
| ERSPG | Eriogonum sphaerocephalum Dougl. ex Benth. var. geniculatum (Nutt.) S. Stokes | Eriogonum sphaerocephalum var. sphaerocephalum | Polygonaceae
|
| ERSPH | Eriogonum sphaerocephalum Dougl. ex Benth. var. halimioides S. Stokes | rock buckwheat | Polygonaceae
|
| ERSPM3 | Eriogonum sphaerocephalum Dougl. ex Benth. var. megacephalum (Nutt.) Stokes ex M.E. Jones | Eriogonum sphaerocephalum var. sphaerocephalum | Polygonaceae
|
| ERSPM4 | Eriogonum sphaerocephalum Dougl. ex Benth. var. minimum (Small) S. Stokes | Eriogonum thymoides | Polygonaceae
|
| ERSPS6 | Eriogonum sphaerocephalum Dougl. ex Benth. var. sericoleucum (Greene) S. Stokes | Eriogonum caespitosum | Polygonaceae
|
| ERSPS4 | Eriogonum sphaerocephalum Dougl. ex Benth. var. sphaerocephalum | rock buckwheat | Polygonaceae
|
| ERSP7 | Eriogonum sphaerocephalum Dougl. ex Benth. | rock buckwheat | Polygonaceae
|
| ERST10 | Eriogonum stellatum Benth. | Eriogonum umbellatum var. ellipticum | Polygonaceae
|
| ERSTA3 | Eriogonum strictum Benth. ssp. proliferum (Torr. & Gray) S. Stokes var. anserinum (Greene) R.J. Davis | Blue Mountain buckwheat | Polygonaceae
|
| ERSTG2 | Eriogonum strictum Benth. ssp. proliferum (Torr. & Gray) S. Stokes var. glabrum C.L. Hitchc. | Blue Mountain buckwheat | Polygonaceae
|
| ERSTP3 | Eriogonum strictum Benth. ssp. proliferum (Torr. & Gray) S. Stokes var. proliferum (Torr. & Gray) C.L. Hitchc. | Blue Mountain buckwheat | Polygonaceae
|
| ERSTP | Eriogonum strictum Benth. ssp. proliferum (Torr. & Gray) S. Stokes | Blue Mountain buckwheat | Polygonaceae
|
| ERSTS3 | Eriogonum strictum Benth. ssp. strictum | Blue Mountain buckwheat | Polygonaceae
|
| ERSTC | Eriogonum strictum Benth. var. cusickii (Gandog.) S. Stokes | Eriogonum strictum ssp. proliferum var. proliferum | Polygonaceae
|
| ERSTF | Eriogonum strictum Benth. var. flavissimum (Gandog.) C.L. Hitchc. | Eriogonum strictum ssp. proliferum var. anserinum | Polygonaceae
|
| ERSTG4 | Eriogonum strictum Benth. var. greenei (Gray) Reveal | Eriogonum strictum ssp. proliferum var. proliferum | Polygonaceae
|
| ERSTL | Eriogonum strictum Benth. var. lachnostegium Benth. | Eriogonum niveum | Polygonaceae
|
| ERSTT2 | Eriogonum strictum Benth. var. tenue (Small) S. Stokes | Eriogonum douglasii var. sublineare | Polygonaceae
|
| ERST4 | Eriogonum strictum Benth. | Blue Mountain buckwheat | Polygonaceae
|
| ERSU11 | Eriogonum subalpinum Greene | Eriogonum umbellatum var. majus | Polygonaceae
|
| ERSU5 | Eriogonum subreniforme S. Wats. | kidneyshape buckwheat | Polygonaceae
|
| ERSU8 | Eriogonum suffruticosum S. Wats. | bushy buckwheat | Polygonaceae
|
| ERSUA | Eriogonum sulcatum S. Wats. var. argense M.E. Jones | Eriogonum heermannii var. argense | Polygonaceae
|
| ERSU12 | Eriogonum sulcatum S. Wats. | Eriogonum heermannii var. sulcatum | Polygonaceae
|
| ERTE15 | Eriogonum temblorense J.T. Howell & Twisselmann | Temblor buckwheat | Polygonaceae
|
| ERTEC | Eriogonum tenellum Torr. ssp. cottamii S. Stokes | Eriogonum brevicaule var. cottamii | Polygonaceae
|
| ERTEC3 | Eriogonum tenellum Torr. var. caulescens Torr. & Gray | Eriogonum tenellum var. ramosissimum | Polygonaceae
|
| ERTEP | Eriogonum tenellum Torr. var. platyphyllum (Torr. ex Benth.) Torr. | tall buckwheat | Polygonaceae
|
| ERTER | Eriogonum tenellum Torr. var. ramosissimum Benth. | tall buckwheat | Polygonaceae
|
| ERTET | Eriogonum tenellum Torr. var. tenellum | tall buckwheat | Polygonaceae
|
| ERTE9 | Eriogonum tenellum Torr. | tall buckwheat | Polygonaceae
|
| ERTE16 | Eriogonum tenue Small | Eriogonum douglasii var. sublineare | Polygonaceae
|
| ERTEC2 | Eriogonum ternatum T.J. Howell var. congdonii (S. Stokes) J.T. Howell | Eriogonum congdonii | Polygonaceae
|
| ERTE10 | Eriogonum ternatum T.J. Howell | ternate buckwheat | Polygonaceae
|
| ERTE17 | Eriogonum tetraneuris Small | Eriogonum lachnogynum | Polygonaceae
|
| ERTH | Eriogonum thomasii Torr. | Thomas' buckwheat | Polygonaceae
|
| ERTHA | Eriogonum thompsoniae S. Wats. var. albiflorum Reveal | Thompson's buckwheat | Polygonaceae
|
| ERTHA2 | Eriogonum thompsoniae S. Wats. var. atwoodii Reveal | Atwood's buckwheat | Polygonaceae
|
| ERTHM | Eriogonum thompsoniae S. Wats. var. matthewsiae (Reveal) Reveal | Matthews' buckwheat | Polygonaceae
|
| ERTHT | Eriogonum thompsoniae S. Wats. var. thompsoniae | Thompson's buckwheat | Polygonaceae
|
| ERTH2 | Eriogonum thompsoniae S. Wats. | Thompson's buckwheat | Polygonaceae
|
| ERTH3 | Eriogonum thurberi Torr. | Thurber's buckwheat | Polygonaceae
|
| ERTHC2 | Eriogonum thymoides Benth. ssp. congestum S. Stokes | Eriogonum thymoides | Polygonaceae
|
| ERTH4 | Eriogonum thymoides Benth. | thymeleaf buckwheat | Polygonaceae
|
| ERTI | Eriogonum tiehmii Reveal | Tiehm's buckwheat | Polygonaceae
|
| ERTO2 | Eriogonum tomentosum Michx. | dogtongue buckwheat | Polygonaceae
|
| ERTO3 | Eriogonum torreyanum Gray | Eriogonum umbellatum var. torreyanum | Polygonaceae
|
| ERTRM | Eriogonum trichopes Torr. ssp. minus (Benth.) S. Stokes | Eriogonum trichopes var. trichopes | Polygonaceae
|
| ERTRH | Eriogonum trichopes Torr. var. hooveri Reveal | Hoover's deserttrumpet | Polygonaceae
|
| ERTRT3 | Eriogonum trichopes Torr. var. trichopes | little deserttrumpet | Polygonaceae
|
| ERTR8 | Eriogonum trichopes Torr. | little deserttrumpet | Polygonaceae
|
| ERTR9 | Eriogonum tripodum Greene | tripod buckwheat | Polygonaceae
|
| ERTR18 | Eriogonum triste S. Wats. | Eriogonum alatum var. alatum | Polygonaceae
|
| ERTR10 | Eriogonum tristichum Small | Eriogonum lonchophyllum var. lonchophyllum | Polygonaceae
|
| ERTR11 | Eriogonum truncatum Torr. & Gray | Mt. Diablo buckwheat | Polygonaceae
|
| ERTU2 | Eriogonum tumulosum (Barneby) Reveal | Woodside buckwheat | Polygonaceae
|
| ERTU3 | Eriogonum turbinatum Small | Eriogonum deflexum var. deflexum | Polygonaceae
|
| ERTW2 | Eriogonum twisselmannii (J.T. Howell) Reveal | Twisselmann's buckwheat | Polygonaceae
|
| ERUMA5 | Eriogonum umbellatum Torr. ssp. aridum (Greene) S. Stokes | Eriogonum umbellatum var. dichrocephalum | Polygonaceae
|
| ERUMB2 | Eriogonum umbellatum Torr. ssp. bahiiforme (Torr. & Gray) Munz | Eriogonum umbellatum var. bahiiforme | Polygonaceae
|
| ERUMC5 | Eriogonum umbellatum Torr. ssp. covillei (Small) Munz | Eriogonum umbellatum var. covillei | Polygonaceae
|
| ERUMD4 | Eriogonum umbellatum Torr. ssp. dumosum (Greene) S. Stokes | Eriogonum umbellatum var. polyanthum | Polygonaceae
|
| ERUMF2 | Eriogonum umbellatum Torr. ssp. ferrissii (A. Nels.) S. Stokes | Eriogonum umbellatum var. subaridum | Polygonaceae
|
| ERUMM8 | Eriogonum umbellatum Torr. ssp. majus (Hook.) Piper | Eriogonum umbellatum var. majus | Polygonaceae
|
| ERUMM7 | Eriogonum umbellatum Torr. ssp. minus (I.M. Johnston) Munz | Eriogonum umbellatum var. minus | Polygonaceae
|
| ERUMM6 | Eriogonum umbellatum Torr. ssp. munzii (Reveal) Thorne ex Munz | Eriogonum umbellatum var. munzii | Polygonaceae
|
| ERUMP3 | Eriogonum umbellatum Torr. ssp. polyanthum (Benth.) S. Stokes | Eriogonum umbellatum var. polyanthum | Polygonaceae
|
| ERUMS5 | Eriogonum umbellatum Torr. ssp. stellatum (Benth.) S. Stokes | Eriogonum umbellatum var. ellipticum | Polygonaceae
|
| ERUMS6 | Eriogonum umbellatum Torr. ssp. subaridum (S. Stokes) Munz | Eriogonum umbellatum var. subaridum | Polygonaceae
|
| ERUMV3 | Eriogonum umbellatum Torr. ssp. versicolor (S. Stokes) Munz | Eriogonum umbellatum var. versicolor | Polygonaceae
|
| ERUMA2 | Eriogonum umbellatum Torr. var. argus Reveal | sulphur-flower buckwheat | Polygonaceae
|