| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| SYRE2 | Syringa reticulata (Blume) Hara | Japanese tree lilac | Oleaceae
|
| SYVI3 | Syringa villosa Vahl | villous lilac | Oleaceae
|
| SYVU | Syringa vulgaris L. | common lilac | Oleaceae
|
| SYRIN | Syringa L. | lilac | Oleaceae
|
| SYFI | Syringodium filiforme Kuetz. | Cymodocea filiformis | Cymodoceaceae
|
| SYIS2 | Syringodium isoetifolium (Aschers.) Dandy | | Cymodoceaceae
|
| SYRIN2 | Syringodium K�tz. | | Cymodoceaceae
|
| SYFI3 | Syrrhopodon filigerus Williams | Syrrhopodon parasiticus | Calymperaceae
|
| SYFL3 | Syrrhopodon floridanus Sull. in Sull. & Lesq. | Syrrhopodon incompletus | Calymperaceae
|
| SYGA | Syrrhopodon gaudichaudii Mont. | Gaudichaud's syrrhopodon moss | Calymperaceae
|
| SYIN | Syrrhopodon incompletus Schwaegr. | incomplete syrrhopodon moss | Calymperaceae
|
| SYLI | Syrrhopodon ligulatus Mont. | ligulate syrrhopodon moss | Calymperaceae
|
| SYPA8 | Syrrhopodon parasiticus (Brid.) Besch. | parasite syrrhopodon moss | Calymperaceae
|
| SYPR2 | Syrrhopodon prolifer Schwaegr. | syrrhopodon moss | Calymperaceae
|
| SYTE5 | Syrrhopodon texanus Sull. | Texan syrrhopodon moss | Calymperaceae
|
| SYRRH | Syrrhopodon Schwaegr. | syrrhopodon moss | Calymperaceae
|
| SYVO | Systenotheca vortriedei (Brandeg.) Reveal & Hardham | Vortriede's spineflower | Polygonaceae
|
| SYSTE | Systenotheca Reveal & Hardham | spineflower | Polygonaceae
|
| SYAQ | Syzygium aqueum (Burman f.) Alston | watery roseapple | Myrtaceae
|
| SYAR2 | Syzygium aromaticum (L.) Merr. & Perry | clove | Myrtaceae
|
| SYCU | Syzygium cumini (L.) Skeels | Java plum | Myrtaceae
|
| SYGR2 | Syzygium grande (Wight) Wight ex Walp. | sea apple | Myrtaceae
|
| SYJA3 | Syzygium jambolanum DC. | Syzygium cumini | Myrtaceae
|
| SYJA | Syzygium jambos (L.) Alston | Malabar plum | Myrtaceae
|
| SYJA2 | Syzygium javanicum Miq. | Java plum | Myrtaceae
|
| SYMA2 | Syzygium malaccense (L.) Merr. & Perry | Malaysian apple | Myrtaceae
|
| SYPA7 | Syzygium paniculatum Gaertner | brush cherry | Myrtaceae
|
| SYSA3 | Syzygium samarangense (Blume) Merr. & Perry | syzygium | Myrtaceae
|
| SYSA | Syzygium sandwicense (Gray) Niedenzu | 'ohi'a ha | Myrtaceae
|
| SYZYG | Syzygium P. Br. ex Gaertn. | syzygium | Myrtaceae
|
| SYBA2 | Syzygospora bachmannii Diederich & M. S. Crist. | | Syzygosporaceae
|
| SYPH2 | Syzygospora physciacearum Diederich | | Syzygosporaceae
|
| SYZYG2 | Syzygospora G. W. Martin | syzygospora | Syzygosporaceae
|
| SZTS | Szczawinskia tsugae Funk | | Uncertain Lichen Family
|
| SZCZA | Szczawinskia Funk | szczawinskia | Uncertain Lichen Family
|
| TAAR7 | Tabebuia argentea (Bureau & K. Schum.) Britt. | Tabebuia aurea | Bignoniaceae
|
| TAAU2 | Tabebuia aurea (Manso) Benth. & Hook. f. ex S. Moore | Caribbean trumpet-tree | Bignoniaceae
|
| TACA12 | Tabebuia caraiba (Mart.) Bureau | Tabebuia aurea | Bignoniaceae
|
| TACH3 | Tabebuia chrysantha (Jacq.) Nichols. | roble amarillo | Bignoniaceae
|
| TADO2 | Tabebuia donnell-smithii Rose | primavera | Bignoniaceae
|
| TAHA | Tabebuia haemantha (Bertol. ex Spreng.) DC. | roble cimarron | Bignoniaceae
|
| TAHEP | Tabebuia heterophylla (DC.) Britt. ssp. pallida auct. non (Miers) Stehl� | Tabebuia heterophylla | Bignoniaceae
|
| TAHE | Tabebuia heterophylla (DC.) Britt. | white cedar | Bignoniaceae
|
| TALU | Tabebuia lucida Britt. | Tabebuia heterophylla | Bignoniaceae
|
| TAPA10 | Tabebuia pallida sensu Liogier & Martorell | Tabebuia heterophylla | Bignoniaceae
|
| TAPE4 | Tabebuia pentaphylla (DC.) Hemsl. | Tabebuia heterophylla | Bignoniaceae
|
| TARI | Tabebuia rigida Urban | roble de sierra | Bignoniaceae
|
| TARO | Tabebuia rosea (Bertol.) DC. | pink trumpet-tree | Bignoniaceae
|
| TASC2 | Tabebuia schumanniana Urban | roble colorado | Bignoniaceae
|
| TASE4 | Tabebuia serratifolia (Vahl) Nichols. | yellow poui | Bignoniaceae
|
| TATR3 | Tabebuia triphylla DC. | Tabebuia heterophylla | Bignoniaceae
|
| TABEB | Tabebuia Gomes ex DC. | trumpet-tree | Bignoniaceae
|
| TAAL4 | Tabernaemontana alba P. Mill. | white milkwood | Apocynaceae
|
| TACI | Tabernaemontana citrifolia L. | milkwood | Apocynaceae
|
| TACO2 | Tabernaemontana coronaria (L.) Willd. | Tabernaemontana divaricata | Apocynaceae
|
| TADI5 | Tabernaemontana divaricata (L.) R. Br. ex Roemer & J.A. Schultes | pinwheelflower | Apocynaceae
|
| TAOP | Tabernaemontana oppositifolia (Spreng.) Urban | Tabernaemontana citrifolia | Apocynaceae
|
| TABER | Tabernaemontana L. | milkwood | Apocynaceae
|
| TAIN4 | Tacca involucrata Schumacher & Thonn. | Tacca leontopetaloides | Taccaceae
|
| TALE2 | Tacca leontopetaloides (L.) Kuntze | batflower | Taccaceae
|
| TAPI | Tacca pinnatifida Forster & Forster f. | Tacca leontopetaloides | Taccaceae
|
| TACCA | Tacca J.R. & G. Forst. | tacca | Taccaceae
|
| TAMO2 | Tacsonia mollissima Kunth | Passiflora mollissima | Passifloraceae
|
| TAAS2 | Taeniatherum asperum auct. non (Simonkai) Nevski | Taeniatherum caput-medusae | Poaceae
|
| TACA8 | Taeniatherum caput-medusae (L.) Nevski | medusahead | Poaceae
|
| TACRC | Taeniatherum crinitum (Schreb.) Nevski var. caput-medusae (L.) Wipff | Taeniatherum caput-medusae | Poaceae
|
| TAENI2 | Taeniatherum Nevski | medusahead | Poaceae
|
| TAIN | Taenidia integerrima (L.) Drude | yellow pimpernel | Apiaceae
|
| TAMO | Taenidia montana (Mackenzie) Cronq. | mountain pimpernel | Apiaceae
|
| TAENI | Taenidia (Torr. & Gray) Drude | taenidia | Apiaceae
|
| TAAL2 | Tagetes alamensis Rydb. | Tagetes lemmonii | Asteraceae
|
| TABO2 | Tagetes bonariensis Pers. | Tagetes minuta | Asteraceae
|
| TACO4 | Tagetes corymbosa Sweet | Tagetes patula | Asteraceae
|
| TAER | Tagetes erecta L. | Aztec marigold | Asteraceae
|
| TAFR2 | Tagetes fragrantissima Sess� & Moc. | Tagetes micrantha | Asteraceae
|
| TAGL2 | Tagetes glandulifera Schrank | Tagetes minuta | Asteraceae
|
| TAGL3 | Tagetes glandulosa Schrank ex Link | Tagetes minuta | Asteraceae
|
| TALE | Tagetes lemmonii Gray | Lemmon's marigold | Asteraceae
|
| TALU3 | Tagetes lucida Cav. | sweetscented marigold | Asteraceae
|
| TAMA2 | Tagetes major Gaertn. | Tagetes erecta | Asteraceae
|
| TAMI | Tagetes micrantha Cav. | licorice marigold | Asteraceae
|
| TAMI2 | Tagetes minima L. | miniature marigold | Asteraceae
|
| TAMI3 | Tagetes minuta L. | muster John Henry | Asteraceae
|
| TAPA11 | Tagetes palmeri Gray | Tagetes lemmonii | Asteraceae
|
| TAPA8 | Tagetes papposa Vent. | Dyssodia papposa | Asteraceae
|
| TAPA | Tagetes patula L. | French marigold | Asteraceae
|
| TAPO2 | Tagetes porophylla Vell. | Tagetes minuta | Asteraceae
|
| TAPU5 | Tagetes pusilla Kunth | lesser marigold | Asteraceae
|
| TARE3 | Tagetes remotiflora Kunze | Tagetes patula | Asteraceae
|
| TARO2 | Tagetes rotundifolia P. Mill. | Tithonia rotundifolia | Asteraceae
|
| TASI3 | Tagetes signata Bartling | Tagetes patula | Asteraceae
|
| TATE4 | Tagetes tenuifolia Millsp. | Tagetes patula | Asteraceae
|
| TAGET | Tagetes L. | marigold | Asteraceae
|
| TAFR | Talinopsis frutescens Gray | arroyo fameflower | Portulacaceae
|
| TALIN | Talinopsis Gray | talinopsis | Portulacaceae
|
| TAAN2 | Talinum angustissimum (Gray) Woot. & Standl. | Talinum aurantiacum | Portulacaceae
|
| TAAP2 | Talinum appalachianum W. Wolf | Talinum parviflorum | Portulacaceae
|
| TAAUA | Talinum aurantiacum Engelm. var. angustissimum Gray | Talinum aurantiacum | Portulacaceae
|
| TAAU | Talinum aurantiacum Engelm. | orange fameflower | Portulacaceae
|
| TABR3 | Talinum brevicaule S. Wats. | dwarf fameflower | Portulacaceae
|
| TABR | Talinum brevifolium Torr. | pygmy fameflower | Portulacaceae
|