| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| MAMI13 | Marsilea minuta L. | dwarf waterclover | Marsileaceae
|
| MAMO4 | Marsilea mollis B.L. Robins. & Fern. | Chihuahuan waterclover | Marsileaceae
|
| MAMU5 | Marsilea mucronata A. Braun | Marsilea vestita ssp. vestita | Marsileaceae
|
| MAOL3 | Marsilea oligospora Goodding | Pacific waterclover | Marsileaceae
|
| MAPO4 | Marsilea polycarpa Hook. & Grev. | Guayanan waterclover | Marsileaceae
|
| MAQU | Marsilea quadrifolia L. | European waterclover | Marsileaceae
|
| MATE7 | Marsilea tenuifolia Engelm. ex A. Braun | Marsilea vestita ssp. tenuifolia | Marsileaceae
|
| MAUN2 | Marsilea uncinata A. Braun | Marsilea vestita ssp. vestita | Marsileaceae
|
| MAVET | Marsilea vestita Hook. & Grev. ssp. tenuifolia (Engelm. ex A. Braun) D.M. Johnson | hairy waterclover | Marsileaceae
|
| MAVEV | Marsilea vestita Hook. & Grev. ssp. vestita | hairy waterclover | Marsileaceae
|
| MAVEM | Marsilea vestita Hook. & Grev. var. mucronata (A. Braun) Baker | Marsilea vestita ssp. vestita | Marsileaceae
|
| MAVE2 | Marsilea vestita Hook. & Grev. | hairy waterclover | Marsileaceae
|
| MAVEO | Marsilea vestiva Hook. & Grev. var. oligospora (Goodding) Dorn | Marsilea oligospora | Marsileaceae
|
| MAVI4 | Marsilea villosa Kaulfuss | villous waterclover | Marsileaceae
|
| MARSI | Marsilea L. | waterclover | Marsileaceae
|
| MAAD | Marsupella adusta (Nees) Spruce | | Gymnomitriaceae
|
| MAAL16 | Marsupella alpina (Gottsche ex Limpr.) Bernet | | Gymnomitriaceae
|
| MAAR15 | Marsupella arctica (Berggr.) Bryhn & Kaal. | | Gymnomitriaceae
|
| MABO6 | Marsupella boeckii (Austin) Lindb. ex Kaal. | | Gymnomitriaceae
|
| MABO7 | Marsupella bolanderi (Austin) Underw. | | Gymnomitriaceae
|
| MABR10 | Marsupella brevissima (Dumort.) Grolle | | Gymnomitriaceae
|
| MACO31 | Marsupella commutata (Limpr.) Bernet | | Gymnomitriaceae
|
| MACO32 | Marsupella condensata (�ngstr.) Schiffn. | | Gymnomitriaceae
|
| MAEMA2 | Marsupella emarginata (Ehrh.) Dumort. ssp. emarginata var. aquatica (Ehrh.) Dumort. | | Gymnomitriaceae
|
| MAEME | Marsupella emarginata (Ehrh.) Dumort. ssp. emarginata var. emarginata | | Gymnomitriaceae
|
| MAEME2 | Marsupella emarginata (Ehrh.) Dumort. ssp. emarginata | | Gymnomitriaceae
|
| MAEML | Marsupella emarginata (Ehrh.) Dumort. ssp. tubulosa (Steph.) N. Kitag. var. latiloba R. M. Schust. | | Gymnomitriaceae
|
| MAEMT | Marsupella emarginata (Ehrh.) Dumort. ssp. tubulosa (Steph.) N. Kitag. | | Gymnomitriaceae
|
| MAEM4 | Marsupella emarginata (Ehrh.) Dumort. | | Gymnomitriaceae
|
| MAFU4 | Marsupella funckii (F. Weber & D. Mohr) Dumort. | | Gymnomitriaceae
|
| MAPA24 | Marsupella paroica R. M. Schust. | | Gymnomitriaceae
|
| MARE16 | Marsupella revoluta (Nees) Dumort. | | Gymnomitriaceae
|
| MASP10 | Marsupella sparsifolia (Lindb.) Dumort. | | Gymnomitriaceae
|
| MASP11 | Marsupella sphacelata (Gieseke) Dumort. | | Gymnomitriaceae
|
| MASP12 | Marsupella spiniloba R. M. Schust. & Damsh.. | | Gymnomitriaceae
|
| MASP13 | Marsupella sprucei (Limpr.) Bernet | | Gymnomitriaceae
|
| MARSU | Marsupella Dumort. | | Gymnomitriaceae
|
| MACH3 | Marsypianthes chamaedrys (Vahl) Kuntze | ortela | Lamiaceae
|
| MARSY | Marsypianthes Mart. ex Benth. | marsypianthes | Lamiaceae
|
| MAFR8 | Martiusia fragrans (Small) Small | Clitoria fragrans | Fabaceae
|
| MALA10 | Martiusia laurifolia (Poir.) Britt. | Clitoria laurifolia | Fabaceae
|
| MAMA19 | Martiusia mariana (L.) Small | Clitoria mariana | Fabaceae
|
| MARU4 | Martiusia rubiginosa (Juss. ex Pers.) Britt. | Clitoria falcata | Fabaceae
|
| MAAL10 | Martynia althaeifolia Benth. | Proboscidea althaeifolia | Pedaliaceae
|
| MAAN7 | Martynia annua L. | una de gato | Pedaliaceae
|
| MAAR10 | Martynia arenaria Engelm. | Proboscidea althaeifolia | Pedaliaceae
|
| MAFR6 | Martynia fragrans Lindl. | Proboscidea louisianica ssp. fragrans | Pedaliaceae
|
| MALO6 | Martynia louisiana Miller | Proboscidea louisianica | Pedaliaceae
|
| MALO4 | Martynia louisianica P. Mill. | Proboscidea louisianica ssp. louisianica | Pedaliaceae
|
| MALU3 | Martynia lutea Lindl. | Ibicella lutea | Pedaliaceae
|
| MAPA16 | Martynia parviflora Woot. | Proboscidea parviflora | Pedaliaceae
|
| MAPR7 | Martynia proboscidea Gloxin | Proboscidea louisianica | Pedaliaceae
|
| MARTY | Martynia L. | martynia | Pedaliaceae
|
| MACO22 | Maruta cotula (L.) DC. | Anthemis cotula | Asteraceae
|
| MACO34 | Masdevallia coccinea Linden ex Lindl. | | Orchidaceae
|
| MASDE | Masdevallia Ruiz & Pavon | masdevallia | Orchidaceae
|
| MARI60 | Masonhalea richardsonii (Hook.) Karnefelt | | Parmeliaceae
|
| MASON2 | Masonhalea Karnefelt | masonhalea | Parmeliaceae
|
| MACA19 | Massalongia carnosa (Dickson) Korber | littlelobed lichen | Peltigeraceae
|
| MAMI10 | Massalongia microphylliza (Nyl. ex Hasse) Henssen | littlelobed lichen | Peltigeraceae
|
| MASSA | Massalongia Korber | littlelobed lichen | Peltigeraceae
|
| MAFO2 | Mastichodendron foetidissimum (Jacq.) H.J. Lam | Sideroxylon foetidissimum | Sapotaceae
|
| MAPO9 | Mastichodendron portoricense (Urban) Alain | Sideroxylon portoricense | Sapotaceae
|
| MAAU8 | Mastigolejeunea auriculata (Wilson & Hook.) Schiffn. | | Lejeuneaceae
|
| MASTI2 | Mastigolejeunea (Spruce) Schiffn. | | Lejeuneaceae
|
| MAWO4 | Mastigophora woodsii (Hook.) Nees | | Mastigophoraceae
|
| MASTI3 | Mastigophora Nees nom. cons. | | Mastigophoraceae
|
| MATE15 | Mastodia tesselata Hook. f. & Harvey | Kohlmeyera complicatula | Mastodiaceae
|
| MADO2 | Matayba domingensis (DC.) Radlk. | negra lora | Sapindaceae
|
| MATAY | Matayba Aubl. | matayba | Sapindaceae
|
| MAAL6 | Matelea alabamensis (Vail) Woods. | Alabama milkvine | Asclepiadaceae
|
| MAAR12 | Matelea arizonica (Gray) Shinners | Arizona milkvine | Asclepiadaceae
|
| MABA4 | Matelea balbisii (Dcne.) Woods. | Balbis' milkvine | Asclepiadaceae
|
| MABA3 | Matelea baldwyniana (Sweet) Woods. | Baldwin's milkvine | Asclepiadaceae
|
| MABI6 | Matelea biflora (Raf.) Woods. | star milkvine | Asclepiadaceae
|
| MABO3 | Matelea borinquensis Alain | San Lorenzo milkvine | Asclepiadaceae
|
| MABR2 | Matelea brevicoronata (B.L. Robins.) Woods. | shortcrown milkvine | Asclepiadaceae
|
| MACA9 | Matelea carolinensis (Jacq.) Woods. | maroon Carolina milkvine | Asclepiadaceae
|
| MACO27 | Matelea cordifolia (Gray) Woods. | Sonoran milkvine | Asclepiadaceae
|
| MACY3 | Matelea cynanchoides (Engelm.) Woods. | prairie milkvine | Asclepiadaceae
|
| MADE3 | Matelea decipiens (Alexander) Woods. | oldfield milkvine | Asclepiadaceae
|
| MAED | Matelea edwardsensis Correll | plateau milkvine | Asclepiadaceae
|
| MAFL3 | Matelea flavidula (Chapman) Woods. | yellow Carolina milkvine | Asclepiadaceae
|
| MAFL5 | Matelea floridana (Vail) Woods. | Florida milkvine | Asclepiadaceae
|
| MAGO | Matelea gonocarpos (Walt.) Shinners | angularfruit milkvine | Asclepiadaceae
|
| MAMA15 | Matelea maritima (Jacq.) Woods. | beach milkvine | Asclepiadaceae
|
| MAOB2 | Matelea obliqua (Jacq.) Woods. | climbing milkvine | Asclepiadaceae
|
| MAPA8 | Matelea parviflora (Torr.) Woods. | smallflower milkvine | Asclepiadaceae
|
| MAPA9 | Matelea parvifolia (Torr.) Woods. | spearleaf | Asclepiadaceae
|
| MAPR3 | Matelea producta (Torr.) Woods. | Texas milkvine | Asclepiadaceae
|
| MAPU3 | Matelea pubiflora (Dcne.) Woods. | trailing milkvine | Asclepiadaceae
|
| MARA5 | Matelea radiata Correll | falfurrias milkvine | Asclepiadaceae
|
| MARE4 | Matelea reticulata (Engelm. ex Gray) Woods. | netted milkvine | Asclepiadaceae
|
| MASA4 | Matelea sagittifolia (Gray) Woods. | arrowleaf milkvine | Asclepiadaceae
|
| MASH2 | Matelea shortii (Gray) Woods. | Matelea obliqua | Asclepiadaceae
|
| MASI4 | Matelea sintenisii (Schlechter) Woods. | Sintenis' milkvine | Asclepiadaceae
|
| MASU2 | Matelea suberosus auct. non (L.) Shinners | Matelea gonocarpos | Asclepiadaceae
|
| MATE10 | Matelea texensis Correll | Transpecos milkvine | Asclepiadaceae
|
| MAVA2 | Matelea variifolia (Schlechter) Woods. | variableleaf milkvine | Asclepiadaceae
|
| MAWO2 | Matelea woodsonii Shinners | Woodson's milkvine | Asclepiadaceae
|
| MATEL | Matelea Aubl. | milkvine | Asclepiadaceae
|