| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| MOMA6 | Morella ×macfarlanei (Youngken) Kartesz, comb. nov. ined. | | Myricaceae
|
| MOPE6 | Morella pensylvanica (Mirbel) Kartesz, comb. nov. ined. | northern bayberry | Myricaceae
|
| MOREL2 | Morella Lour. | bayberry | Myricaceae
|
| MOGA | Morelotia gahniiformis Gaud. | Gahnia gahniiformis | Cyperaceae
|
| MOAR6 | Moricandia arvensis (L.) DC. | purple mistress | Brassicaceae
|
| MORIC | Moricandia DC. | moricandia | Brassicaceae
|
| MOCI3 | Morinda citrifolia L. | Indian mulberry | Rubiaceae
|
| MORO2 | Morinda royoc L. | redgal | Rubiaceae
|
| MOSA2 | Morinda sandwicensis O. Deg. | Morinda trimera | Rubiaceae
|
| MOTR | Morinda trimera Hbd. | noni kuahiwi | Rubiaceae
|
| MORIN | Morinda L. | morinda | Rubiaceae
|
| MOMO4 | Moringa moringa (L.) Millsp. | Moringa oleifera | Moringaceae
|
| MOOL | Moringa oleifera Lam. | horseradishtree | Moringaceae
|
| MOPT | Moringa pterygosperma Gaertner | Moringa oleifera | Moringaceae
|
| MORIN2 | Moringa Adans. | moringa | Moringaceae
|
| MOAM | Morisonia americana L. | ratapple | Capparaceae
|
| MORIS | Morisonia L. | morisonia | Capparaceae
|
| MOFO2 | Morocarpus foliosus Moench | Chenopodium foliosum | Chenopodiaceae
|
| MOAN2 | Morongia angustata (Torr. & Gray) Britt. | Mimosa microphylla | Fabaceae
|
| MOLA11 | Morongia latidens Small | Mimosa latidens | Fabaceae
|
| MOMI3 | Morongia microphylla (Dry.) Britt. | Mimosa microphylla | Fabaceae
|
| MOOC | Morongia occidentalis Woot. & Standl. | Mimosa rupertiana | Fabaceae
|
| MOPO | Morongia portoricensis (Urban) Britt. | Mimosa quadrivalvis var. urbaniana | Fabaceae
|
| MOUN4 | Morongia uncinata (Willd.) Britt. | Mimosa microphylla | Fabaceae
|
| MOOD3 | Morrenia odorata (Hook. & Arn.) Lindl. | latexplant | Asclepiadaceae
|
| MORRE | Morrenia Lindl. | morrenia | Asclepiadaceae
|
| MOGR2 | Mortonia greggii Gray | Gregg's saddlebush | Celastraceae
|
| MOSCU | Mortonia scabrella Gray var. utahensis Coville ex Gray | Mortonia utahensis | Celastraceae
|
| MOSC | Mortonia scabrella Gray | Rio Grande saddlebush | Celastraceae
|
| MOSE | Mortonia sempervirens Gray | Rio Grande saddlebush | Celastraceae
|
| MOUT | Mortonia utahensis (Coville ex Gray) A. Nels. | Utah mortonia | Celastraceae
|
| MORTO | Mortonia Gray | saddlebush | Celastraceae
|
| MOALT | Morus alba L. var. tatarica (L.) Ser. | Morus alba | Moraceae
|
| MOAL | Morus alba L. | white mulberry | Moraceae
|
| MOCO3 | Morus confinis Greene | Morus microphylla | Moraceae
|
| MOCR2 | Morus crataegifolia Greene | Morus microphylla | Moraceae
|
| MOGR4 | Morus grisea Greene | Morus microphylla | Moraceae
|
| MOMI | Morus microphylla Buckl. | Texas mulberry | Moraceae
|
| MONI | Morus nigra L. | black mulberry | Moraceae
|
| MOPA3 | Morus papyrifera L. | Broussonetia papyrifera | Moraceae
|
| MORA2 | Morus radulina Greene | Morus microphylla | Moraceae
|
| MORUR | Morus rubra L. var. rubra | red mulberry | Moraceae
|
| MORUT | Morus rubra L. var. tomentosa (Raf.) Bureau | red mulberry | Moraceae
|
| MORU2 | Morus rubra L. | red mulberry | Moraceae
|
| MOTA | Morus tatarica L. | Morus alba | Moraceae
|
| MOTI | Morus tinctoria L. | Maclura tinctoria | Moraceae
|
| MORUS | Morus L. | mulberry | Moraceae
|
| MOBA2 | Mosiera bahamensis (Kiaersk.) Small | Psidium longipes var. longipes | Myrtaceae
|
| MOLO2 | Mosiera longipes (Berg) Small | Psidium longipes var. longipes | Myrtaceae
|
| MOGI | Mosigia gibbosa (Ach.) Fr. ex A. Massal. | Rimularia gibbosa | Rimulariaceae
|
| MODI4 | Mosla dianthera (Buch.-Ham. ex Roxb.) Maxim. | miniature beefsteakplant | Lamiaceae
|
| MOSLA | Mosla (Benth.) Buch.-Ham. ex Maxim. | mosla | Lamiaceae
|
| MODO2 | Mouriri domingensis (Tussac) Spach | murta | Melastomataceae
|
| MOHE | Mouriri helleri Britt. | mameyuelo | Melastomataceae
|
| MOURI | Mouriri Aubl. | mouriri | Melastomataceae
|
| MOCA4 | Mozinna cardiophylla Torr. | Jatropha cardiophylla | Euphorbiaceae
|
| MOCI4 | Mozinna cinerea Ortega | Jatropha cinerea | Euphorbiaceae
|
| MUCAS | Mucronea californica Benth. var. suksdorfii (J.F. Macbr.) Goodman | Mucronea californica | Polygonaceae
|
| MUCA3 | Mucronea californica Benth. | California spineflower | Polygonaceae
|
| MUPEO | Mucronea perfoliata (Gray) Heller var. opaca Hoover | Mucronea perfoliata | Polygonaceae
|
| MUPE2 | Mucronea perfoliata (Gray) Heller | perfoliate spineflower | Polygonaceae
|
| MUCRO | Mucronea Benth. | spineflower | Polygonaceae
|
| MUAT2 | Mucuna aterrima (Piper & Tracy) Holland | Mucuna pruriens var. utilis | Fabaceae
|
| MUDE2 | Mucuna deeringiana (Bort) Merr. | Mucuna pruriens var. utilis | Fabaceae
|
| MUGI | Mucuna gigantea (Willd.) DC. | seabean | Fabaceae
|
| MUPRP | Mucuna pruriens (L.) DC. var. pruriens | cowitch | Fabaceae
|
| MUPRU | Mucuna pruriens (L.) DC. var. utilis (Wallich ex Wight) Baker ex Burck | cowitch | Fabaceae
|
| MUPR | Mucuna pruriens (L.) DC. | cowitch | Fabaceae
|
| MURO2 | Mucuna rostrata Benth. | mucuna | Fabaceae
|
| MUSL | Mucuna sloanei Fawcett & Rendle | horseeye bean | Fabaceae
|
| MUUR | Mucuna urens (L.) Medik. | oxeye bean | Fabaceae
|
| MUCUN | Mucuna Adans. | mucuna | Fabaceae
|
| MUAX2 | Muehlenbeckia axillaris (Hook. f.) Walp. | | Polygonaceae
|
| MUAX | Muehlenbeckia axillaris auct. non (Hook. f.) Walp. | Muehlenbeckia complexa | Polygonaceae
|
| MUCO3 | Muehlenbeckia complexa Meisn. | maidenhair vine | Polygonaceae
|
| MUHA | Muehlenbeckia hastatula (Sm.) I.M. Johnston | wirevine | Polygonaceae
|
| MUPL | Muehlenbeckia platyclada (F.J. Muell.) Lindau | Homalocladium platycladum | Polygonaceae
|
| MUEHL | Muehlenbeckia Meisn. | maidenhair vine | Polygonaceae
|
| MULI3 | Muellerella lichenicola (Sommerf. ex Fr.) D. Hawksw. | | Verrucariaceae
|
| MUPYA | Muellerella pygmaea (Korber) D. Hawksw. var. athallina (Mull. Arg.) Triebel | | Verrucariaceae
|
| MUPYV | Muellerella pygmaea (Korber) D. Hawksw. var. ventosicola (Mudd) Triebel | | Verrucariaceae
|
| MUPY | Muellerella pygmaea (Korber) D. Hawksw. | | Verrucariaceae
|
| MUELL | Muellerella Hepp ex Mull. Arg. | muellerella | Verrucariaceae
|
| MUAM | Muhlenbergia ambigua Torr. | Muhlenbergia mexicana | Poaceae
|
| MUAN | Muhlenbergia andina (Nutt.) A.S. Hitchc. | foxtail muhly | Poaceae
|
| MUAP | Muhlenbergia appressa C.O. Goodding | Devils Canyon muhly | Poaceae
|
| MUAR | Muhlenbergia arenacea (Buckl.) A.S. Hitchc. | ear muhly | Poaceae
|
| MUAR2 | Muhlenbergia arenicola Buckl. | sand muhly | Poaceae
|
| MUAR3 | Muhlenbergia arizonica Scribn. | Arizona muhly | Poaceae
|
| MUAR4 | Muhlenbergia arsenei A.S. Hitchc. | Navajo muhly | Poaceae
|
| MUAS | Muhlenbergia asperifolia (Nees & Meyen ex Trin.) Parodi | scratchgrass | Poaceae
|
| MUBR4 | Muhlenbergia brachyphylla Bush | Muhlenbergia bushii | Poaceae
|
| MUBR3 | Muhlenbergia brevifolia (Nutt.) M.E. Jones | Muhlenbergia cuspidata | Poaceae
|
| MUBR2 | Muhlenbergia brevis C.O. Goodding | short muhly | Poaceae
|
| MUBU | Muhlenbergia bushii Pohl | nodding muhly | Poaceae
|
| MUCA | Muhlenbergia californica Vasey | California muhly | Poaceae
|
| MUCAC | Muhlenbergia capillaris (Lam.) Trin. var. capillaris | hairawn muhly | Poaceae
|
| MUCAF | Muhlenbergia capillaris (Lam.) Trin. var. filipes (M.A. Curtis) Chapman ex Beal | gulfhairawn muhly | Poaceae
|
| MUCAT | Muhlenbergia capillaris (Lam.) Trin. var. trichopodes (Ell.) Vasey | cutover muhly | Poaceae
|
| MUCA2 | Muhlenbergia capillaris (Lam.) Trin. | hairawn muhly | Poaceae
|
| MUCO4 | Muhlenbergia comata (Thurb.) Thurb. ex Benth. | Muhlenbergia andina | Poaceae
|