| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| STDR | Stachys drummondii Benth. | Drummond's hedgenettle | Lamiaceae
|
| STEM | Stachys emersonii Piper | Stachys mexicana | Lamiaceae
|
| STEP | Stachys eplingii J. Nelson | Epling's hedgenettle | Lamiaceae
|
| STFL4 | Stachys floridana Shuttlw. ex Benth. | Florida hedgenettle | Lamiaceae
|
| STGE | Stachys germanica L. | German hedgenettle | Lamiaceae
|
| STGL4 | Stachys glabra Riddell | Stachys tenuifolia | Lamiaceae
|
| STGR7 | Stachys grandiflora (Willd.) Benth. | big-sage | Lamiaceae
|
| STGR9 | Stachys grayana House | Stachys aspera | Lamiaceae
|
| STHI6 | Stachys hirta L. | Stachys ocymastrum | Lamiaceae
|
| STHI | Stachys hispida Pursh | Stachys tenuifolia | Lamiaceae
|
| STHO3 | Stachys homotricha (Fern.) Rydb. | Stachys pilosa var. pilosa | Lamiaceae
|
| STHYA | Stachys hyssopifolia Michx. var. ambigua Gray | Stachys aspera | Lamiaceae
|
| STHYL | Stachys hyssopifolia Michx. var. lythroides (Small) J. Nelson | Stachys hyssopifolia | Lamiaceae
|
| STHY3 | Stachys hyssopifolia Michx. | hyssopleaf hedgenettle | Lamiaceae
|
| STLA5 | Stachys latidens Small ex Britt. | broadtooth hedgenettle | Lamiaceae
|
| STLO6 | Stachys longispicata Boiss. | longspike hedgenettle | Lamiaceae
|
| STLY2 | Stachys lythroides Small | Stachys hyssopifolia | Lamiaceae
|
| STME | Stachys mexicana Benth. | Mexican hedgenettle | Lamiaceae
|
| STNU2 | Stachys nuttallii Shuttlw. ex Benth. | heartleaf hedgenettle | Lamiaceae
|
| STOC6 | Stachys ocymastrum (L.) Brig. | | Lamiaceae
|
| STOF2 | Stachys officinalis (L.) Trev. | common hedgenettle | Lamiaceae
|
| STOL2 | Stachys olympica Poir. | Stachys byzantina | Lamiaceae
|
| STPAA2 | Stachys palustris L. ssp. arenicola (Britt.) Gill | Stachys pilosa var. arenicola | Lamiaceae
|
| STPAP2 | Stachys palustris L. ssp. pilosa (Nutt.) Epling | Stachys pilosa var. pilosa | Lamiaceae
|
| STPAE | Stachys palustris L. var. elliptica Clos | Stachys palustris | Lamiaceae
|
| STPAH2 | Stachys palustris L. var. hispida (Pursh) Boivin | Stachys tenuifolia | Lamiaceae
|
| STPAH | Stachys palustris L. var. homotricha Fern. | Stachys pilosa var. pilosa | Lamiaceae
|
| STPAM | Stachys palustris L. var. macrocalyx Jennings | Stachys tenuifolia | Lamiaceae
|
| STPAN | Stachys palustris L. var. nipigonensis Jennings | Stachys pilosa var. pilosa | Lamiaceae
|
| STPAP7 | Stachys palustris L. var. petiolata Clos | Stachys palustris | Lamiaceae
|
| STPAP5 | Stachys palustris L. var. phaneropoda Weatherby | Stachys pilosa var. pilosa | Lamiaceae
|
| STPAP6 | Stachys palustris L. var. pilosa (Nutt.) Fern. | Stachys pilosa var. pilosa | Lamiaceae
|
| STPAP10 | Stachys palustris L. var. puberula Jennings | Stachys pilosa var. pilosa | Lamiaceae
|
| STPAS | Stachys palustris L. var. segetum (Mutel) Grogn. | Stachys palustris | Lamiaceae
|
| STPA | Stachys palustris L. | marsh hedgenettle | Lamiaceae
|
| STPIA | Stachys pilosa Nutt. var. arenicola (Britt.) G. Mulligan & D. Munro | hairy hedgenettle | Lamiaceae
|
| STPIP5 | Stachys pilosa Nutt. var. pilosa | hairy hedgenettle | Lamiaceae
|
| STPI6 | Stachys pilosa Nutt. | hairy hedgenettle | Lamiaceae
|
| STPY | Stachys pycnantha Benth. | shortspike hedgenettle | Lamiaceae
|
| STRI4 | Stachys riddellii House | Stachys nuttallii | Lamiaceae
|
| STRIL | Stachys rigida Nutt. ex Benth. ssp. lanata Epling | Stachys bergii | Lamiaceae
|
| STRIQ | Stachys rigida Nutt. ex Benth. ssp. quercetorum (Heller) Epling | Stachys rigida var. quercetorum | Lamiaceae
|
| STRIR | Stachys rigida Nutt. ex Benth. ssp. rivularis (Heller) Epling | Stachys rigida var. rigida | Lamiaceae
|
| STRIQ2 | Stachys rigida Nutt. ex Benth. var. quercetorum (Heller) G. Mulligan & D. Munro | rough hedgenettle | Lamiaceae
|
| STRIR3 | Stachys rigida Nutt. ex Benth. var. rigida | rough hedgenettle | Lamiaceae
|
| STRI | Stachys rigida Nutt. ex Benth. | rough hedgenettle | Lamiaceae
|
| STRO | Stachys rothrockii Gray | Rothrock's hedgenettle | Lamiaceae
|
| STSA4 | Stachys salvioides Small | Stachys nuttallii | Lamiaceae
|
| STSC6 | Stachys scopulorum Greene | Stachys pilosa var. pilosa | Lamiaceae
|
| STSI5 | Stachys sieboldii Miq. | Stachys affinis | Lamiaceae
|
| STST17 | Stachys stebbinsii G. Mulligan & D. Munro | Stebbins' hedgenettle | Lamiaceae
|
| STST | Stachys stricta Greene | Sonoma hedgenettle | Lamiaceae
|
| STSU | Stachys subcordata Rydb. | Stachys nuttallii | Lamiaceae
|
| STSY2 | Stachys sylvatica L. | whitespot | Lamiaceae
|
| STTEA | Stachys tenuifolia Willd. var. aspera (Michx.) Fern. | Stachys aspera | Lamiaceae
|
| STTEH | Stachys tenuifolia Willd. var. hispida (Pursh) Fern. | Stachys tenuifolia | Lamiaceae
|
| STTEL | Stachys tenuifolia Willd. var. latidens (Small ex Britt.) J. Nelson | Stachys latidens | Lamiaceae
|
| STTEP | Stachys tenuifolia Willd. var. perlonga Fern. | Stachys tenuifolia | Lamiaceae
|
| STTEP2 | Stachys tenuifolia Willd. var. platyphylla Fern. | Stachys tenuifolia | Lamiaceae
|
| STTE | Stachys tenuifolia Willd. | smooth hedgenettle | Lamiaceae
|
| STTE10 | Stachys teucriifolia Rydb. | Stachys pilosa var. pilosa | Lamiaceae
|
| STTE9 | Stachys teucriiformis Rydb. | Stachys pilosa var. pilosa | Lamiaceae
|
| STTU2 | Stachys tuberifera Naudin | Stachys affinis | Lamiaceae
|
| STACH | Stachys L. | hedgenettle | Lamiaceae
|
| STAU | Stachytarpheta australis Moldenke | Stachytarpheta dichotoma | Verbenaceae
|
| STCA8 | Stachytarpheta cayennensis (L.C. Rich.) Vahl | cayenne porterweed | Verbenaceae
|
| STDI8 | Stachytarpheta dichotoma (Ruiz & Pav�n) Vahl | branched porterweed | Verbenaceae
|
| STGR14 | Stachytarpheta �gracilis Danser | | Verbenaceae
|
| STHY2 | Stachytarpheta �hybrida Moldenke | | Verbenaceae
|
| STIN2 | Stachytarpheta indica Vahl | Stachytarpheta jamaicensis | Verbenaceae
|
| STIN3 | Stachytarpheta �intercedens Danser | | Verbenaceae
|
| STJA | Stachytarpheta jamaicensis (L.) Vahl | light-blue snakeweed | Verbenaceae
|
| STMU2 | Stachytarpheta mutabilis (Jacq.) Vahl | changeable velvetberry | Verbenaceae
|
| STST4 | Stachytarpheta strigosa Vahl | West Indian porterweed | Verbenaceae
|
| STTR3 | Stachytarpheta �trimeni Rech. | | Verbenaceae
|
| STUR | Stachytarpheta urticifolia Sims | nettleleaf velvetberry | Verbenaceae
|
| STACH2 | Stachytarpheta Vahl | porterweed | Verbenaceae
|
| STIN11 | Stackhousia intermedia F.M. Bailey | | Stackhousiaceae
|
| STACK | Stackhousia Sm. | | Stackhousiaceae
|
| STMO | Stahlia monosperma (Tul.) Urban | cobana negra | Fabaceae
|
| STAHL | Stahlia Bello | stahlia | Fabaceae
|
| STCA23 | Stanfordia californica S. Wats. | St. Francis cabbage | Brassicaceae
|
| STANF | Stanfordia S. Wats. | stanfordia | Brassicaceae
|
| STANH2 | Stanhopea J. Frost ex Hook. | stanhopea | Orchidaceae
|
| STAL2 | Stanleya albescens M.E. Jones | white princesplume | Brassicaceae
|
| STAN5 | Stanleya annua M.E. Jones | Stanleya confertiflora | Brassicaceae
|
| STBI6 | Stanleya bipinnata Greene | Stanleya pinnata var. bipinnata | Brassicaceae
|
| STCO2 | Stanleya confertiflora (B.L. Robins.) T.J. Howell | Oregon princesplume | Brassicaceae
|
| STEL | Stanleya elata M.E. Jones | Panamint princesplume | Brassicaceae
|
| STIN9 | Stanleya integrifolia James ex Torr. | Stanleya pinnata var. integrifolia | Brassicaceae
|
| STPII3 | Stanleya pinnata (Pursh) Britt. ssp. inyoensis Munz & Roos | Stanleya pinnata var. inyoensis | Brassicaceae
|
| STPIB | Stanleya pinnata (Pursh) Britt. var. bipinnata (Greene) Rollins | bipinnate princesplume | Brassicaceae
|
| STPIG | Stanleya pinnata (Pursh) Britt. var. gibberosa Rollins | Stanleya pinnata var. bipinnata | Brassicaceae
|
| STPII | Stanleya pinnata (Pursh) Britt. var. integrifolia (James ex Torr.) Rollins | golden princesplume | Brassicaceae
|
| STPII2 | Stanleya pinnata (Pursh) Britt. var. inyoensis (Munz & Roos) Reveal | Inyo princesplume | Brassicaceae
|
| STPIP | Stanleya pinnata (Pursh) Britt. var. pinnata | desert princesplume | Brassicaceae
|
| STPIT | Stanleya pinnata (Pursh) Britt. var. typica Rollins | Stanleya pinnata var. pinnata | Brassicaceae
|
| STPI | Stanleya pinnata (Pursh) Britt. | desert princesplume | Brassicaceae
|
| STRA2 | Stanleya rara A. Nels. | Stanleya confertiflora | Brassicaceae
|
| STTOR | Stanleya tomentosa Parry var. runcinata (Rydb.) Rollins | woolly princesplume | Brassicaceae
|
| STTOT | Stanleya tomentosa Parry var. tomentosa | woolly princesplume | Brassicaceae
|