| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| MERI2 | Mesynium rigidum (Pursh) A.& D. Löve | Linum rigidum var. rigidum | Linaceae
|
| MESU7 | Mesynium subteres (Trel.) W.A. Weber | Linum subteres | Linaceae
|
| MESU8 | Mesynium sulcatum (Riddell) A.& D. Löve | Linum sulcatum var. sulcatum | Linaceae
|
| MEVE4 | Mesynium vernale (Woot.) W.A. Weber | Linum vernale | Linaceae
|
| MECU3 | Metalepis cubensis (A. Rich.) Griseb. | Cynanchum cubense | Asclepiadaceae
|
| MEME6 | Metamelaena melambola (Tuck.) Henssen | | Lichinaceae
|
| METAM | Metamelaena Henssen | metamelaena | Lichinaceae
|
| MEME8 | Metaneckera menziesii (Hook. in Drumm.) Steere | Menzies' metaneckera moss | Neckeraceae
|
| METAN | Metaneckera Steere | metaneckera moss | Neckeraceae
|
| MEJA | Metaplexis japonica (Thunb.) Makino | rough potato | Asclepiadaceae
|
| METAP | Metaplexis R. Br. | metaplexis | Asclepiadaceae
|
| MEGL8 | Metasequoia glyptostroboides Hu & W. C. Cheng | dawn redwood | Taxodiaceae
|
| METAS2 | Metasequoia Miki ex Hu & W. C. Cheng | dawn redwood | Taxodiaceae
|
| MEAN4 | Metastelma anegadense Britt. | Cynanchum anegadense | Asclepiadaceae
|
| MEAR7 | Metastelma arizonicum Gray | Cynanchum arizonicum | Asclepiadaceae
|
| MEBA4 | Metastelma barbigerum Scheele | Cynanchum barbigerum | Asclepiadaceae
|
| MEBL | Metastelma blodgettii Gray | Cynanchum blodgettii | Asclepiadaceae
|
| MEDE9 | Metastelma decaisneanum Schlechter | Cynanchum grisebachianum | Asclepiadaceae
|
| MEDE7 | Metastelma decipiens Schlechter | Cynanchum cheesmanii | Asclepiadaceae
|
| MEEP | Metastelma ephedroides (Griseb.) Schlechter | Cynanchum ephedroides | Asclepiadaceae
|
| MEFA3 | Metastelma fallax Schlechter | Cynanchum cheesmanii | Asclepiadaceae
|
| MEGR13 | Metastelma grisebachianum Schlechter | Cynanchum grisebachianum | Asclepiadaceae
|
| MELE8 | Metastelma leptocladon (Dcne.) Schlechter | Cynanchum ephedroides | Asclepiadaceae
|
| MELI8 | Metastelma lineare Bello | Cynanchum lineare | Asclepiadaceae
|
| MEME13 | Metastelma mexicanum (Brandeg) M. Fishbein & R. Levin | Cynanchum wigginsii | Asclepiadaceae
|
| MEMO8 | Metastelma monense Britt. | Cynanchum monense | Asclepiadaceae
|
| MEPA13 | Metastelma palmeri S. Wats. | Cynanchum maccartii | Asclepiadaceae
|
| MEPA14 | Metastelma parviflorum (Sw.) R. Br. ex J.A. Schultes | Cynanchum parviflorum | Asclepiadaceae
|
| MEPR5 | Metastelma pringlei Gray | Cynanchum pringlei | Asclepiadaceae
|
| MESC4 | Metastelma scoparium (Nutt.) Vail | Cynanchum scoparium | Asclepiadaceae
|
| MEPA16 | Meteoriopsis patula (Hedw.) Broth | Zelometeorium patulum | Meteoriaceae
|
| METO3 | Metopium toxiferum (L.) Krug & Urban | Florida poisontree | Anacardiaceae
|
| METOP | Metopium P. Br. | Florida poisontree | Anacardiaceae
|
| MECOP | Metrosideros collina (J.R. & G. Forst.) Gray ssp. polymorpha (Gaud.) Rock | Metrosideros polymorpha var. polymorpha | Myrtaceae
|
| MECOG | Metrosideros collina (J.R. & G. Forst.) Gray var. glaberrima (Levl.) Rock | Metrosideros polymorpha var. glaberrima | Myrtaceae
|
| MECOG2 | Metrosideros collina (J.R. & G. Forst.) Gray var. glabrifolia (Heller) Rock | Metrosideros polymorpha var. glaberrima | Myrtaceae
|
| MECOH | Metrosideros collina (J.R. & G. Forst.) Gray var. haleakalensis Rock | Metrosideros polymorpha var. glaberrima | Myrtaceae
|
| MECOH2 | Metrosideros collina (J.R. & G. Forst.) Gray var. hemilanata Hochr. | Metrosideros polymorpha var. glaberrima | Myrtaceae
|
| MECOI | Metrosideros collina (J.R. & G. Forst.) Gray var. imbricata Rock | Metrosideros polymorpha var. incana | Myrtaceae
|
| MECOI2 | Metrosideros collina (J.R. & G. Forst.) Gray var. incana (Levl.) Rock | Metrosideros polymorpha var. incana | Myrtaceae
|
| MECOM | Metrosideros collina (J.R. & G. Forst.) Gray var. macrophylla Rock | Metrosideros polymorpha var. macrophylla | Myrtaceae
|
| MECON2 | Metrosideros collina (J.R. & G. Forst.) Gray var. newellii Rock | Metrosideros polymorpha var. newellii | Myrtaceae
|
| MECOP2 | Metrosideros collina (J.R. & G. Forst.) Gray var. prostrata Rock | Metrosideros polymorpha var. pumila | Myrtaceae
|
| MECOP3 | Metrosideros collina (J.R. & G. Forst.) Gray var. pumila (Heller) Rock | Metrosideros polymorpha var. pumila | Myrtaceae
|
| MECO10 | Metrosideros collina auct. non (J.R. & G. Forst.) Gray | Metrosideros polymorpha var. polymorpha | Myrtaceae
|
| MEMA4 | Metrosideros macropus Hook. & Arn. | 'ohi'a | Myrtaceae
|
| MEPOG3 | Metrosideros polymorpha Gaud. ssp. glaberrima (Levl.) Skottsberg | Metrosideros polymorpha var. glaberrima | Myrtaceae
|
| MEPOG4 | Metrosideros polymorpha Gaud. ssp. glabrifolia (Heller) Skottsberg | Metrosideros polymorpha var. glaberrima | Myrtaceae
|
| MEPOI3 | Metrosideros polymorpha Gaud. ssp. imbricata (Rock) Skottsberg | Metrosideros polymorpha var. incana | Myrtaceae
|
| MEPOI4 | Metrosideros polymorpha Gaud. ssp. incana (Levl.) Skottsberg | Metrosideros polymorpha var. incana | Myrtaceae
|
| MEPOM3 | Metrosideros polymorpha Gaud. ssp. micrantha Skottsberg | Metrosideros polymorpha var. macrophylla | Myrtaceae
|
| MEPOD | Metrosideros polymorpha Gaud. var. dieteri J.W. Dawson & Stemmermann | 'ohi'a lehua | Myrtaceae
|
| MEPOF | Metrosideros polymorpha Gaud. var. fauriei (Levl.) Skottsberg | Metrosideros waialealae var. fauriei | Myrtaceae
|
| MEPOG | Metrosideros polymorpha Gaud. var. glaberrima (Levl.) St. John | 'ohi'a lehua | Myrtaceae
|
| MEPOG2 | Metrosideros polymorpha Gaud. var. glabrifolia (Heller) St. John | Metrosideros polymorpha var. glaberrima | Myrtaceae
|
| MEPOH | Metrosideros polymorpha Gaud. var. haleakalensis (Rock) St. John | Metrosideros polymorpha var. glaberrima | Myrtaceae
|
| MEPOH2 | Metrosideros polymorpha Gaud. var. hemilanata (Hochr.) St. John | Metrosideros polymorpha var. glaberrima | Myrtaceae
|
| MEPOI | Metrosideros polymorpha Gaud. var. imbricata (Rock) St. John | Metrosideros polymorpha var. incana | Myrtaceae
|
| MEPOI2 | Metrosideros polymorpha Gaud. var. incana (Levl.) Skottsberg | 'ohi'a lehua | Myrtaceae
|
| MEPOM | Metrosideros polymorpha Gaud. var. macrophylla (Rock) St. John | 'ohi'a lehua | Myrtaceae
|
| MEPOM4 | Metrosideros polymorpha Gaud. var. macrostemon Skottsberg | Metrosideros polymorpha var. polymorpha | Myrtaceae
|
| MEPOM2 | Metrosideros polymorpha Gaud. var. micrantha (Skottsberg) St. John | Metrosideros polymorpha var. macrophylla | Myrtaceae
|
| MEPON | Metrosideros polymorpha Gaud. var. newellii (Rock) St. John | 'ohi'a lehua | Myrtaceae
|
| MEPON2 | Metrosideros polymorpha Gaud. var. nuda Skottsberg | Metrosideros polymorpha var. glaberrima | Myrtaceae
|
| MEPOP6 | Metrosideros polymorpha Gaud. var. parviflora Skottsberg | Metrosideros polymorpha var. glaberrima | Myrtaceae
|
| MEPOP2 | Metrosideros polymorpha Gaud. var. polymorpha | 'ohi'a lehua | Myrtaceae
|
| MEPOP | Metrosideros polymorpha Gaud. var. prostrata (Rock) St. John | Metrosideros polymorpha var. pumila | Myrtaceae
|
| MEPOP3 | Metrosideros polymorpha Gaud. var. pseudorugosa Skottsberg | 'ohi'a lehua | Myrtaceae
|
| MEPOP4 | Metrosideros polymorpha Gaud. var. pumila (Heller) Skottsberg | 'ohi'a lehua | Myrtaceae
|
| MEPOS | Metrosideros polymorpha Gaud. var. sericea (Rock) Skottsberg | Metrosideros polymorpha var. glaberrima | Myrtaceae
|
| MEPOS2 | Metrosideros polymorpha Gaud. var. subimbricata Skottsberg | Metrosideros polymorpha var. incana | Myrtaceae
|
| MEPO5 | Metrosideros polymorpha Gaud. | 'ohi'a lehua | Myrtaceae
|
| MEPUM2 | Metrosideros pumila (Heller) Hochr. var. makanoiensis Hochr. | Metrosideros polymorpha var. pumila | Myrtaceae
|
| MEPU10 | Metrosideros pumila (Heller) Hochr. | Metrosideros polymorpha var. pumila | Myrtaceae
|
| MERU2 | Metrosideros rugosa Gray | lehua papa | Myrtaceae
|
| METR5 | Metrosideros tremuloides (Heller) P. Knuth | lehua 'ahihi | Myrtaceae
|
| MEWAF | Metrosideros waialealae (Rock) Rock var. fauriei (Levl.) J.W. Dawson & Stemmermann | Kauai bottlebrush | Myrtaceae
|
| MEWAW | Metrosideros waialealae (Rock) Rock var. waialealae | Kauai bottlebrush | Myrtaceae
|
| MEWA | Metrosideros waialealae (Rock) Rock | Kauai bottlebrush | Myrtaceae
|
| METRO | Metrosideros Banks ex Gaertn. | lehua | Myrtaceae
|
| MEAM4 | Metroxylon amicarum (H. A. Wendl.) Becc. | Caroline ivory nutpalm | Arecaceae
|
| MERU5 | Metroxylon rumphii (Willd.) C. Martius | Metroxylon sagu | Arecaceae
|
| MESA7 | Metroxylon sagu Rottb. | sago palm | Arecaceae
|
| METRO2 | Metroxylon Rottb. | metroxylon | Arecaceae
|
| MECOC2 | Metzgeria conjugata Lindb. ssp. conjugata | | Metzgeriaceae
|
| MECO19 | Metzgeria conjugata Lindb. | | Metzgeriaceae
|
| MECR10 | Metzgeria crassipilis (Lindb.) A. Evans | | Metzgeriaceae
|
| MEFUS | Metzgeria furcata (L.) Dumort. var. setigera R. M. Schust. | | Metzgeriaceae
|
| MEFUU | Metzgeria furcata (L.) Dumort. var. ulvula Nees | | Metzgeriaceae
|
| MEFU4 | Metzgeria furcata (L.) Dumort. | | Metzgeriaceae
|
| MELEL | Metzgeria leptoneura Spruce var. leptoneura | | Metzgeriaceae
|
| MELEP | Metzgeria leptoneura Spruce var. polychaeta R. M. Schust. | | Metzgeriaceae
|
| MELE7 | Metzgeria leptoneura Spruce | | Metzgeriaceae
|
| MEMY | Metzgeria myriopoda Lindb. | | Metzgeriaceae
|
| METE11 | Metzgeria temperata Kuwah. | | Metzgeriaceae
|
| MEUN3 | Metzgeria uncigera A. Evans | | Metzgeriaceae
|
| METZG | Metzgeria Raddi | | Metzgeriaceae
|
| MEFI | Meximalva filipes (Gray) Fryxell | texasfan | Malvaceae
|
| MEXIM | Meximalva Fryxell | meximalva | Malvaceae
|
| MEER3 | Meyenia erecta Benth. | Thunbergia erecta | Acanthaceae
|
| MEKA | Mezonevron kavaiense (Mann) Hbd. | Caesalpinia kavaiensis | Fabaceae
|