| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| SHOSH | Shoshonea Evert & Constance | shoshonea | Apiaceae
|
| SIDE | Sibara deserti (M.E. Jones) Rollins | desert winged rockcress | Brassicaceae
|
| SIFI | Sibara filifolia (Greene) Greene | Santa Cruz Island winged rockcress | Brassicaceae
|
| SIGR14 | Sibara grisea Rollins | Marble Canyon winged rockcress | Brassicaceae
|
| SIRO | Sibara rosulata Rollins | California winged rockcress | Brassicaceae
|
| SIRUB | Sibara runcinata (S. Wats.) Rollins var. brachycarpa Rollins | Sibara viereckii | Brassicaceae
|
| SIRU | Sibara runcinata (S. Wats.) Rollins | Sibara viereckii | Brassicaceae
|
| SIVI5 | Sibara viereckii (O.E. Schultz) Rollins | Viereck's winged rockcress | Brassicaceae
|
| SIVI2 | Sibara virginica (L.) Rollins | Virginia winged rockcress | Brassicaceae
|
| SIBAR | Sibara Greene | winged rockcress | Brassicaceae
|
| SIHA8 | Sibaropsis hammittii S. Boyd & T.S. Ross | | Brassicaceae
|
| SIBAR2 | Sibaropsis S. Boyd & T.S. Ross | sibaropsis | Brassicaceae
|
| SIPR | Sibbaldia procumbens L. | creeping sibbaldia | Rosaceae
|
| SIBBA | Sibbaldia L. | sibbaldia | Rosaceae
|
| SITR3 | Sibbaldiopsis tridentata (Ait.) Rydb. | shrubby fivefingers | Rosaceae
|
| SIBBA2 | Sibbaldiopsis Rydb. | sibbaldiopsis | Rosaceae
|
| SIOD | Sicana odorifera (Vell.) Naud. | casa banana | Cucurbitaceae
|
| SICAN | Sicana Naud. | sicana | Cucurbitaceae
|
| SILIT | Sicydium lindheimeri (Gray) Greene var. tenuisectum Gray | Ibervillea tenuisecta | Cucurbitaceae
|
| SIAL7 | Sicyos albus (St. John) Telford | white burr cucumber | Cucurbitaceae
|
| SIAM | Sicyos ampelophyllus Woot. & Standl. | streamside burr cucumber | Cucurbitaceae
|
| SIAN | Sicyos angulatus L. | oneseed burr cucumber | Cucurbitaceae
|
| SIAN4 | Sicyos anunu (St. John) Telford | lava burr cucumber | Cucurbitaceae
|
| SIAT3 | Sicyos atollensis St. John | Sicyos maximowiczii | Cucurbitaceae
|
| SICA13 | Sicyos caumii St. John | Sicyos maximowiczii | Cucurbitaceae
|
| SICU3 | Sicyos cucumerinus Gray | Gray's burr cucumber | Cucurbitaceae
|
| SIER | Sicyos erostratus St. John | Kealia Gulch burr cucumber | Cucurbitaceae
|
| SIGL | Sicyos glaber Woot. | smooth burr cucumber | Cucurbitaceae
|
| SIHE9 | Sicyos herbstii (St. John) Telford | Herbst's burr cucumber | Cucurbitaceae
|
| SIHI5 | Sicyos hillebrandii St. John | Maui burr cucumber | Cucurbitaceae
|
| SIHI6 | Sicyos hispidus Hbd. | pricklyfruit burr cucumber | Cucurbitaceae
|
| SILAG | Sicyos laciniatus L. var. genuinus Cogn. | Sicyos laciniatus | Cucurbitaceae
|
| SILA | Sicyos laciniatus L. | cutleaf burr cucumber | Cucurbitaceae
|
| SILA9 | Sicyos lamoureuxii St. John | Sicyos maximowiczii | Cucurbitaceae
|
| SILA19 | Sicyos lasiocephalus Skottsberg | Hualalai burr cucumber | Cucurbitaceae
|
| SILA10 | Sicyos laysanensis St. John | Sicyos pachycarpus | Cucurbitaceae
|
| SILO8 | Sicyos lobata Michx. | Echinocystis lobata | Cucurbitaceae
|
| SIMA6 | Sicyos macrophyllus Gray | alpine burr cucumber | Cucurbitaceae
|
| SIMA7 | Sicyos maximowiczii Cogn. | puaokama | Cucurbitaceae
|
| SIMI3 | Sicyos microcarpus Mann | Sicyos pachycarpus | Cucurbitaceae
|
| SIMI8 | Sicyos microphyllus Kunth | small-leaf burr cucumber | Cucurbitaceae
|
| SINI2 | Sicyos nihoaensis St. John | Sicyos pachycarpus | Cucurbitaceae
|
| SINI3 | Sicyos niihauensis St. John | Sicyos maximowiczii | Cucurbitaceae
|
| SIPA6 | Sicyos pachycarpus Hook. & Arn. | paha | Cucurbitaceae
|
| SIPA8 | Sicyos partitus St. John | Sicyos lasiocephalus | Cucurbitaceae
|
| SIPA | Sicyos parviflorus Willd. | smallflower burr cucumber | Cucurbitaceae
|
| SIRE6 | Sicyos remyanus Cogn. | Sicyos pachycarpus | Cucurbitaceae
|
| SISE5 | Sicyos semitonsus St. John | Laysan burr cucumber | Cucurbitaceae
|
| SITR6 | Sicyos trifoliatus L. | Cissus trifoliata | Vitaceae
|
| SIWA2 | Sicyos waimanaloensis St. John | talus slope burr cucumber | Cucurbitaceae
|
| SICYO | Sicyos L. | burr cucumber | Cucurbitaceae
|
| SIGR | Sicyosperma gracile Gray | climbing arrowheads | Cucurbitaceae
|
| SICYO2 | Sicyosperma Gray | sicyosperma | Cucurbitaceae
|
| SIAB | Sida abutifolia P. Mill. | spreading fanpetals | Malvaceae
|
| SIAC4 | Sida acuminata DC. | Sidastrum multiflorum | Malvaceae
|
| SIACC | Sida acuta Burm. f. ssp. carpinifolia (L. f.) Waalkes | Sida acuta | Malvaceae
|
| SIACC2 | Sida acuta Burm. f. var. carpinifolia (L. f.) K. Schum. | Sida acuta | Malvaceae
|
| SIAC3 | Sida acuta Burm. f. | common wireweed | Malvaceae
|
| SIAG | Sida aggregata K. Presl | savannah fanpetals | Malvaceae
|
| SIAL10 | Sida alata S. Wats. | Horsfordia alata | Malvaceae
|
| SIAL6 | Sida alba L. | Sida spinosa | Malvaceae
|
| SIAL8 | Sida alcaeoides Michx. | Callirhoe alcaeoides | Malvaceae
|
| SIAN11 | Sida angustifolia auct. p.p. non Lam. | Sida spinosa | Malvaceae
|
| SIAN5 | Sida antillensis Urban | Antilles fanpetals | Malvaceae
|
| SICA17 | Sida carpinifolia L. f. | Sida acuta | Malvaceae
|
| SICIM | Sida ciliaris L. var. mexicana (Moric. ex Ser.) Shinners | Sida ciliaris | Malvaceae
|
| SICI | Sida ciliaris L. | bracted fanpetals | Malvaceae
|
| SICO7 | Sida cordata (Burm. f.) Waalkes | heartleaf fanpetals | Malvaceae
|
| SICO9 | Sida cordata auct. non (Burm. f.) Waalkes | Sida repens | Malvaceae
|
| SICO | Sida cordifolia L. | llima | Malvaceae
|
| SICR2 | Sida cristata L. | Anoda cristata | Malvaceae
|
| SICU4 | Sida cuneifolia Gray, non Roxb. | Billieturnera helleri | Malvaceae
|
| SIEG2 | Sida eggersii E.G. Baker | Abutilon virginianum | Malvaceae
|
| SIEL | Sida elliottii Torr. & Gray | Elliott's fanpetals | Malvaceae
|
| SIER4 | Sida erecta Macfad. | Sida salviifolia | Malvaceae
|
| SIFAK | Sida fallax Walp. var. kauaiensis Hochr. | Sida fallax | Malvaceae
|
| SIFA | Sida fallax Walp. | yellow llima | Malvaceae
|
| SIFI4 | Sida filicaulis Torr. & Gray | Sida abutifolia | Malvaceae
|
| SIFI5 | Sida filiformis Moric. ex Ser. | Sida abutifolia | Malvaceae
|
| SIFI7 | Sida filipes Gray | Meximalva filipes | Malvaceae
|
| SIGL4 | Sida glabra P. Mill. | smooth fanpetals | Malvaceae
|
| SIGL5 | Sida glomerata Comm. ex Cav. | clustered fanpetals | Malvaceae
|
| SIGL6 | Sida glutinosa Comm. ex Cav. | sticky fanpetals | Malvaceae
|
| SIGR2 | Sida grayana I. Clem. | Billieturnera helleri | Malvaceae
|
| SIHE8 | Sida hederacea (Dougl. ex Hook.) Torr. ex Gray | Malvella leprosa | Malvaceae
|
| SIHE12 | Sida helleri Rose ex Heller | Billieturnera helleri | Malvaceae
|
| SIHE3 | Sida hermaphrodita (L.) Rusby | Virginia fanpetals | Malvaceae
|
| SIHI7 | Sida hispida Pursh | Malvastrum hispidum | Malvaceae
|
| SIHO2 | Sida holwayi Baker & Rose | Sida salviifolia | Malvaceae
|
| SIHUV | Sida humilis Cav. var. veronicifolia Lam. | Sida cordata | Malvaceae
|
| SIHU | Sida humilis sensu Britt. & Wilson | Sida repens | Malvaceae
|
| SIIN5 | Sida inflexa Fern. | pineland fanpetals | Malvaceae
|
| SIJA | Sida jamaicensis L. | Jamaican fanpetals | Malvaceae
|
| SIJAE | Sida javensis Cav. ssp. expilosa Waalkes | Sida repens | Malvaceae
|
| SILE3 | Sida ledyardii St. John | Sida fallax | Malvaceae
|
| SILES | Sida lepidota Gray var. sagittifolia Gray | Malvella sagittifolia | Malvaceae
|
| SILE6 | Sida lepidota Gray | Malvella lepidota | Malvaceae
|
| SILED | Sida leprosa (Ortega) K. Schum. var. depauperata (Gray) I. Clem. | Malvella lepidota | Malvaceae
|
| SILEH | Sida leprosa (Ortega) K. Schum. var. hederacea (Dougl. ex Hook.) K. Schum. | Malvella leprosa | Malvaceae
|
| SILES2 | Sida leprosa (Ortega) K. Schum. var. sagittifolia (Gray) I. Clem. | Malvella sagittifolia | Malvaceae
|
| SILE4 | Sida leprosa (Ortega) K. Schum. | Malvella leprosa | Malvaceae
|