| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| MEDEO | Medeola L. | Indian cucumber | Liliaceae
|
| MEAP3 | Medicago apiculata auct. non Willd. | Medicago polymorpha | Fabaceae
|
| MEARI | Medicago arabica (L.) Huds. ssp. inermis Ricker | Medicago arabica | Fabaceae
|
| MEAR | Medicago arabica (L.) Huds. | spotted medick | Fabaceae
|
| MEDE13 | Medicago denticulata Willd. | Medicago polymorpha | Fabaceae
|
| MEFA | Medicago falcata L. | Medicago sativa ssp. falcata | Fabaceae
|
| MEHE5 | Medicago heldreichii E. Small | Heldreich's alfalfa | Fabaceae
|
| MEHIA | Medicago hispida Gaertn. var. apiculata (Willd.) Urban | Medicago polymorpha | Fabaceae
|
| MEHIC | Medicago hispida Gaertn. var. confinis (W.D.J. Koch) Burnat | Medicago polymorpha | Fabaceae
|
| MEHI | Medicago hispida Gaertn. | Medicago polymorpha | Fabaceae
|
| MEHY4 | Medicago hybrida (Pourret) Trautv. | hybrid alfalfa | Fabaceae
|
| MELA5 | Medicago laciniata (L.) P. Mill. | cutleaf medick | Fabaceae
|
| MELII | Medicago littoralis Rhode ex Loisel. var. inermis Moris | Medicago littoralis | Fabaceae
|
| MELI5 | Medicago littoralis Rhode ex Loisel. | water medick | Fabaceae
|
| MELUC | Medicago lupulina L. var. cupaniana (Guss.) Boiss. | Medicago lupulina | Fabaceae
|
| MELUG | Medicago lupulina L. var. glandulosa Neilr. | Medicago lupulina | Fabaceae
|
| MELU | Medicago lupulina L. | black medick | Fabaceae
|
| MEMA13 | Medicago maculata Sibth. | Medicago arabica | Fabaceae
|
| MEMIC | Medicago minima (L.) L. var. compacta Neyraut | Medicago minima | Fabaceae
|
| MEMIL | Medicago minima (L.) L. var. longiseta DC. | Medicago minima | Fabaceae
|
| MEMIP | Medicago minima (L.) L. var. pubescens Webb | Medicago minima | Fabaceae
|
| MEMI | Medicago minima (L.) L. | burr medick | Fabaceae
|
| MEMO10 | Medicago monantha (C.A. Mey.) Trautv. | medick | Fabaceae
|
| MEMO5 | Medicago monspeliaca (L.) Trautv. | hairy medick | Fabaceae
|
| MEOR2 | Medicago orbicularis (L.) Bartalini | blackdisk medick | Fabaceae
|
| MEPO8 | Medicago polycarpa Willd. | Medicago polymorpha | Fabaceae
|
| MEPOB | Medicago polymorpha L. var. brevispina (Benth.) Heyn | Medicago polymorpha | Fabaceae
|
| MEPOC | Medicago polymorpha L. var. ciliaris (Ser.) Shinners | Medicago polymorpha | Fabaceae
|
| MEPOP7 | Medicago polymorpha L. var. polygyra (Urban) Shinners | Medicago polymorpha | Fabaceae
|
| MEPOT | Medicago polymorpha L. var. tricycla (Gren. & Godr.) Shinners | Medicago polymorpha | Fabaceae
|
| MEPOV | Medicago polymorpha L. var. vulgaris (Benth.) Shinners | Medicago polymorpha | Fabaceae
|
| MEPO3 | Medicago polymorpha L. | burclover | Fabaceae
|
| MEPR | Medicago praecox DC. | Mediterranean medick | Fabaceae
|
| MERI3 | Medicago rigidula (L.) All. | Tifton burclover | Fabaceae
|
| MERU3 | Medicago rugosa Desr. | wrinkled medick | Fabaceae
|
| MERU6 | Medicago ruthenica (L.) Trautv. | alfalfa | Fabaceae
|
| MESAF | Medicago sativa L. ssp. falcata (L.) Arcang. | yellow alfalfa | Fabaceae
|
| MESAS | Medicago sativa L. ssp. sativa | alfalfa | Fabaceae
|
| MESAV8 | Medicago sativa L. ssp. varia (Martyn) Arcang. | Medicago sativa ssp. sativa | Fabaceae
|
| MESA | Medicago sativa L. | alfalfa | Fabaceae
|
| MESC6 | Medicago scutellata (L.) P. Mill. | snail medick | Fabaceae
|
| METR11 | Medicago tribuloides Desr. ex Lam. | Medicago truncatula | Fabaceae
|
| METR10 | Medicago truncatula Gaertner (incl. var. longeaculeata Urban) | barrelclover | Fabaceae
|
| METU | Medicago turbinata (L.) All. | southern medick | Fabaceae
|
| MEVA2 | Medicago �varia Martyn | Medicago sativa ssp. sativa | Fabaceae
|
| MEDIC | Medicago L. | alfalfa | Fabaceae
|
| MECU6 | Medinilla cummingii Naud. | | Melastomataceae
|
| MEMA20 | Medinilla magnifica Lindl. | | Melastomataceae
|
| MEVE3 | Medinilla venosa (Blume) Blume | holdtight | Melastomataceae
|
| MEDIN | Medinilla Gaud. | medinilla | Melastomataceae
|
| MENI4 | Medusulina nitida (Eschw.) Mull. Arg. | | Graphidaceae
|
| METE6 | Medusulina texana Mull. Arg. | | Graphidaceae
|
| MEDUS | Medusulina Mull. Arg. | medusulina | Graphidaceae
|
| MECO | Meehania cordata (Nutt.) Britt. | Meehan's mint | Lamiaceae
|
| MEEHA | Meehania Britt. | meehania | Lamiaceae
|
| MEHE4 | Meesia hexasticha sensu Grout | Meesia longiseta | Meesiaceae
|
| MELOM | Meesia longiseta Hedw. var. macounii Grout | Meesia longiseta | Meesiaceae
|
| MELO70 | Meesia longiseta Hedw. | meesia moss | Meesiaceae
|
| METR12 | Meesia trichodes Spruce | Meesia uliginosa | Meesiaceae
|
| METR13 | Meesia trifaria Crum et al. | Meesia triquetra | Meesiaceae
|
| METR70 | Meesia triquetra (Richt.) �ngstr. | meesia moss | Meesiaceae
|
| METR14 | Meesia tristicha Bruch | Meesia triquetra | Meesiaceae
|
| MEULA | Meesia uliginosa Hedw. var. alpina (Bruch) Hampe | Meesia uliginosa | Meesiaceae
|
| MEULA2 | Meesia uliginosa Hedw. var. angustifolia (Brid.) Hampe | Meesia uliginosa | Meesiaceae
|
| MEULM | Meesia uliginosa Hedw. var. minor (Brid.) Web. & Mohr | Meesia uliginosa | Meesiaceae
|
| MEUL70 | Meesia uliginosa Hedw. | meesia moss | Meesiaceae
|
| MEESI2 | Meesia Hedw. | meesia moss | Meesiaceae
|
| MEAE2 | Megaceros aenigmaticus R. M. Schust. | | Dendrocerotaceae
|
| MEGAC | Megaceros Campb. | | Dendrocerotaceae
|
| MEAL14 | Megalaria albocincta (Degel.) Tonsberg | | Lecanoraceae
|
| MEBR8 | Megalaria brodoana S. Ekman & Tonsbeg | | Lecanoraceae
|
| MECO20 | Megalaria columbiana (G. Merr.) S. Ekman | | Lecanoraceae
|
| MEGR8 | Megalaria grossa (Pers. ex Nyl.) Hafellner | | Lecanoraceae
|
| MELA15 | Megalaria laureri (Th. Fr.) Hafellner | | Lecanoraceae
|
| MEPU13 | Megalaria pulverea (Borrer) Hafellner & Schreiner | | Lecanoraceae
|
| MEGAL3 | Megalaria Hafellner | megalaria | Lecanoraceae
|
| MESU3 | Megalastrum subincisa (Willd.) A.R. Sm. & R.C. Moran | jagleaf junglefern | Dryopteridaceae
|
| MEGAL2 | Megalastrum Holttum | megalastrum | Dryopteridaceae
|
| MEBEB | Megalodonta beckii (Torr. ex Spreng.) Greene var. beckii | Beck's watermarigold | Asteraceae
|
| MEBEH | Megalodonta beckii (Torr. ex Spreng.) Greene var. hendersonii Sherff | Henderson's watermarigold | Asteraceae
|
| MEBEO | Megalodonta beckii (Torr. ex Spreng.) Greene var. oregonensis Sherff | Oregon watermarigold | Asteraceae
|
| MEBE2 | Megalodonta beckii (Torr. ex Spreng.) Greene | Beck's watermarigold | Asteraceae
|
| MEGAL | Megalodonta Greene | watermarigold | Asteraceae
|
| MEPA15 | Megalospora pachycheila (Tuck.) Sipman | | Megalosporaceae
|
| MEPO7 | Megalospora porphyritis (Tuck.) R. C. Harris | | Megalosporaceae
|
| METU4 | Megalospora tuberculosa (Fee) Sipman | | Megalosporaceae
|
| MEVE7 | Megalospora versicolor (Fee) Zahlbr. | Lopezaria versicolor | Uncertain Lichen Family
|
| MEGAL4 | Megalospora G. Meyer | megalospora | Megalosporaceae
|
| MEBR5 | Megapterium brachycarpum (Gray) Levl. | Oenothera brachycarpa | Onagraceae
|
| MEFR3 | Megapterium fremontii (S. Wats.) Britt. | Oenothera macrocarpa ssp. fremontii | Onagraceae
|
| MEMI6 | Megapterium missouriense (Sims) Spach | Oenothera macrocarpa ssp. macrocarpa | Onagraceae
|
| MEOK | Megapterium oklahomense J.B.S. Norton | Oenothera macrocarpa ssp. oklahomensis | Onagraceae
|
| MEER6 | Megaskepasma erythrochlamys Lindau | Brazilian red cloak | Acanthaceae
|
| MEGAS2 | Megaskepasma Lindau | Brazilian red-cloak | Acanthaceae
|
| MEVE6 | Megaspora verrucosa (Ach.) Hafellner & V. Wirth | | Hymeneliaceae
|
| MEGAS | Megaspora (Clauz. & Roux) Hafellner & V. Wirth | megaspora | Hymeneliaceae
|
| MEPA12 | Megastachya panicoides J. Presl | Leptochloa panicoides | Poaceae
|
| MEUN4 | Megastachya uninervia J. Presl | Leptochloa fusca ssp. uninervia | Poaceae
|
| MEAC2 | Meibomia acuminata (Michx.) Blake | Desmodium glutinosum | Fabaceae
|
| MEAD2 | Meibomia adscendens (Sw.) Kuntze | Desmodium adscendens | Fabaceae
|
| MEAF3 | Meibomia affinis (Schlecht.) Kuntze | Desmodium affine | Fabaceae
|