| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| MOBL | Moerckia blyttii (Moerch) Brockm. | | Pallaviciniaceae
|
| MOHI3 | Moerckia hibernica (Hook.) Gottsche | | Pallaviciniaceae
|
| MOERC | Moerckia Gottsche | | Pallaviciniaceae
|
| MOST4 | Moghania strobilifera (L.) St.-Hil. ex Kuntze | Flemingia strobilifera | Fabaceae
|
| MOBR | Mohavea breviflora Coville | golden desert-snapdragon | Scrophulariaceae
|
| MOCO | Mohavea confertiflora (A. DC.) Heller | ghost flower | Scrophulariaceae
|
| MOHAV | Mohavea Gray | mohavea | Scrophulariaceae
|
| MOMO | Moldavica moldavica (L.) Britt. | Dracocephalum moldavica | Lamiaceae
|
| MOPA4 | Moldavica parviflora (Nutt.) Britt. | Dracocephalum parviflorum | Lamiaceae
|
| MOTH | Moldavica thymiflora (L.) Rydb. | Dracocephalum thymiflorum | Lamiaceae
|
| MOHO2 | Molendoa hornschuchiana (Hook.) Lindb. ex Limpr. | Hornschuch's molendoa moss | Pottiaceae
|
| MOOB | Molendoa obtusifolia Broth. & Par. in Card. | Molendoa sendtneriana | Pottiaceae
|
| MOSE2 | Molendoa sendtneriana (Bruch & Schimp. in B.S.G.) Limpr. | Sendtner's molendoa moss | Pottiaceae
|
| MOLEN | Molendoa Lindb. | molendoa moss | Pottiaceae
|
| MOSA5 | Molina salicifolia Ruiz & Pav�n | Baccharis salicifolia | Asteraceae
|
| MOCA2 | Molinia caerulea (L.) Moench | purple moorgrass | Poaceae
|
| MOMA4 | Molinia maxima Hartman | Glyceria maxima | Poaceae
|
| MOLIN | Molinia Schrank | moorgrass | Poaceae
|
| MOBE3 | Mollugo berteriana Ser. | Mollugo verticillata | Molluginaceae
|
| MOCE | Mollugo cerviana (L.) Ser. | threadstem carpetweed | Molluginaceae
|
| MOGR3 | Mollugo gracillima Anderss. | slender carpetweed | Molluginaceae
|
| MOLO | Mollugo lotoides (L.) C.B. Clarke | Glinus lotoides | Molluginaceae
|
| MONU2 | Mollugo nudicaulis Lam. | nakedstem carpetweed | Molluginaceae
|
| MOPE5 | Mollugo pentaphylla L. | mollugo | Molluginaceae
|
| MORA | Mollugo radiata Ruiz & Pav�n | Glinus radiatus | Molluginaceae
|
| MOTE | Mollugo tetraphylla L. | Polycarpon tetraphyllum ssp. tetraphyllum | Caryophyllaceae
|
| MOVE | Mollugo verticillata L. | green carpetweed | Molluginaceae
|
| MOLLU | Mollugo L. | carpetweed | Molluginaceae
|
| MOLA | Moluccella laevis L. | shellflower | Lamiaceae
|
| MOLUC | Moluccella L. | moluccella | Lamiaceae
|
| MOIG | Momisia iguanaea (Jacq.) Rose & Standl. | Celtis iguanaea | Ulmaceae
|
| MOPA6 | Momisia pallida (Torr.) Planch. | Celtis pallida | Ulmaceae
|
| MOBA | Momordica balsamina L. | southern balsampear | Cucurbitaceae
|
| MOCH2 | Momordica charantia L. | balsampear | Cucurbitaceae
|
| MOCO5 | Momordica cochinchinensis (Lour.) Sprengel | balsampear | Cucurbitaceae
|
| MODI8 | Momordica dioica Roxb. ex Willd. | balsampear | Cucurbitaceae
|
| MOEL | Momordica elaterium L. | Ecballium elaterium | Cucurbitaceae
|
| MOLA7 | Momordica lanata Thunb. | Citrullus lanatus var. lanatus | Cucurbitaceae
|
| MOMOR | Momordica L. | momordica | Cucurbitaceae
|
| MOLI | Monanthochloe littoralis Engelm. | shoregrass | Poaceae
|
| MONAN | Monanthochloe Engelm. | shoregrass | Poaceae
|
| MOAL2 | Monarda allophylla Michx. | Monarda clinopodia | Lamiaceae
|
| MOAR4 | Monarda aristata Nutt. | Monarda citriodora ssp. citriodora var. citriodora | Lamiaceae
|
| MOAU2 | Monarda austromontana Epling | Monarda citriodora ssp. austromontana | Lamiaceae
|
| MOBR2 | Monarda bradburiana Beck | eastern beebalm | Lamiaceae
|
| MOCIA | Monarda citriodora Cerv. ex Lag. ssp. austromontana (Epling) Scora | lemon beebalm | Lamiaceae
|
| MOCIC2 | Monarda citriodora Cerv. ex Lag. ssp. citriodora var. citriodora | lemon beebalm | Lamiaceae
|
| MOCIP2 | Monarda citriodora Cerv. ex Lag. ssp. citriodora var. parva Scora | lemon beebalm | Lamiaceae
|
| MOCIC | Monarda citriodora Cerv. ex Lag. ssp. citriodora | lemon beebalm | Lamiaceae
|
| MOCIA3 | Monarda citriodora Cerv. ex Lag. var. austromontana (Epling) B.L. Turner | Monarda citriodora ssp. austromontana | Lamiaceae
|
| MOCI | Monarda citriodora Cerv. ex Lag. | lemon beebalm | Lamiaceae
|
| MOCL | Monarda clinopodia L. | white bergamot | Lamiaceae
|
| MOCL2 | Monarda clinopodioides Gray | basil beebalm | Lamiaceae
|
| MODI | Monarda didyma L. | scarlet beebalm | Lamiaceae
|
| MODI7 | Monarda dispersa Small | Monarda citriodora ssp. citriodora var. citriodora | Lamiaceae
|
| MOFIB2 | Monarda fistulosa L. ssp. brevis (Fosberg & Artz) Scora, comb. nov. ined. | wild bergamot | Lamiaceae
|
| MOFIF2 | Monarda fistulosa L. ssp. fistulosa var. fistulosa | wild bergamot | Lamiaceae
|
| MOFIM2 | Monarda fistulosa L. ssp. fistulosa var. menthifolia (Graham) Fern. | wild bergamot | Lamiaceae
|
| MOFIM3 | Monarda fistulosa L. ssp. fistulosa var. mollis (L.) Benth. | wild bergamot | Lamiaceae
|
| MOFIR | Monarda fistulosa L. ssp. fistulosa var. rubra Gray | wild bergamot | Lamiaceae
|
| MOFIS | Monarda fistulosa L. ssp. fistulosa var. stipitatoglandulosa (Waterfall) Scora, comb. nov. ined. | wild bergamot | Lamiaceae
|
| MOFIF | Monarda fistulosa L. ssp. fistulosa | wild bergamot | Lamiaceae
|
| MOFIB | Monarda fistulosa L. var. brevis Fosberg & Artz | Monarda fistulosa ssp. brevis | Lamiaceae
|
| MOFIC | Monarda fistulosa L. var. clinopodia (L.) Cooperrider | Monarda clinopodia | Lamiaceae
|
| MOFI | Monarda fistulosa L. | wild bergamot | Lamiaceae
|
| MOFI2 | Monarda fistulosa Sims | Monarda bradburiana | Lamiaceae
|
| MOFR2 | Monarda fruticulosa Epling | spotted beebalm | Lamiaceae
|
| MOLA8 | Monarda lasiodonta (Gray) Small | Monarda punctata ssp. punctata var. lasiodonta | Lamiaceae
|
| MOLI2 | Monarda lindheimeri Engelm. & Gray ex Gray | Lindheimer's beebalm | Lamiaceae
|
| MOMA5 | Monarda maritima (Cory) B.L. Turner | seaside beebalm | Lamiaceae
|
| MOME | Monarda media Willd. | purple bergamot | Lamiaceae
|
| MOME2 | Monarda �medioides Duncan | | Lamiaceae
|
| MOME3 | Monarda menthifolia Graham | Monarda fistulosa ssp. fistulosa var. menthifolia | Lamiaceae
|
| MOMO2 | Monarda mollis L. | Monarda fistulosa ssp. fistulosa var. mollis | Lamiaceae
|
| MOPE | Monarda pectinata Nutt. | pony beebalm | Lamiaceae
|
| MOPUA2 | Monarda punctata L. ssp. arkansana McClintock & Epling | Monarda punctata ssp. punctata var. arkansana | Lamiaceae
|
| MOPUC2 | Monarda punctata L. ssp. coryi McClintock & Epling | Monarda punctata ssp. punctata var. coryi | Lamiaceae
|
| MOPUI2 | Monarda punctata L. ssp. immaculata Pennell | spotted beebalm | Lamiaceae
|
| MOPUI4 | Monarda punctata L. ssp. intermedia McClintock & Epling | Monarda punctata ssp. punctata var. intermedia | Lamiaceae
|
| MOPUO2 | Monarda punctata L. ssp. occidentalis Epling | Monarda punctata ssp. punctata var. occidentalis | Lamiaceae
|
| MOPUA | Monarda punctata L. ssp. punctata var. arkansana (McClintock & Epling) Shinners | spotted beebalm | Lamiaceae
|
| MOPUC3 | Monarda punctata L. ssp. punctata var. correllii B.L. Turner | spotted beebalm | Lamiaceae
|
| MOPUC | Monarda punctata L. ssp. punctata var. coryi (McClintock & Epling) Shinners | spotted beebalm | Lamiaceae
|
| MOPUI3 | Monarda punctata L. ssp. punctata var. intermedia (McClintock & Epling) Waterfall | spotted beebalm | Lamiaceae
|
| MOPUL | Monarda punctata L. ssp. punctata var. lasiodonta Gray | spotted beebalm | Lamiaceae
|
| MOPUO | Monarda punctata L. ssp. punctata var. occidentalis (Epling) Palmer & Steyermark | spotted beebalm | Lamiaceae
|
| MOPUP2 | Monarda punctata L. ssp. punctata var. punctata | spotted beebalm | Lamiaceae
|
| MOPUV | Monarda punctata L. ssp. punctata var. villicaulis (Pennell) Palmer & Steyermark | spotted beebalm | Lamiaceae
|
| MOPUP | Monarda punctata L. ssp. punctata | spotted beebalm | Lamiaceae
|
| MOPUV3 | Monarda punctata L. ssp. villicaulis Pennell | Monarda punctata ssp. punctata var. villicaulis | Lamiaceae
|
| MOPUF | Monarda punctata L. var. fruticulosa (Epling) Scora | Monarda fruticulosa | Lamiaceae
|
| MOPUI | Monarda punctata L. var. immaculata (Pennell) Scora | Monarda punctata ssp. immaculata | Lamiaceae
|
| MOPUL2 | Monarda punctata L. var. leucantha Nash | Monarda punctata ssp. punctata var. punctata | Lamiaceae
|
| MOPUM | Monarda punctata L. var. maritima Cory | Monarda maritima | Lamiaceae
|
| MOPUS2 | Monarda punctata L. var. stanfieldii (Small) Cory | Monarda stanfieldii | Lamiaceae
|
| MOPU | Monarda punctata L. | spotted beebalm | Lamiaceae
|
| MORI2 | Monarda rigida Raf. | Monarda bradburiana | Lamiaceae
|
| MORU | Monarda russeliana Nutt. ex Sims | redpurple beebalm | Lamiaceae
|
| MOSC3 | Monarda scabra Beck | Monarda fistulosa ssp. fistulosa var. mollis | Lamiaceae
|
| MOST5 | Monarda stanfieldii Small | Stanfield's beebalm | Lamiaceae
|
| MOST2 | Monarda stipitatoglandulosa Waterfall | Monarda fistulosa ssp. fistulosa var. stipitatoglandulosa | Lamiaceae
|