| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| MELI4 | Mentzelia lindleyi Torr. & Gray | Lindley's blazingstar | Loasaceae
|
| MELO5 | Mentzelia longiloba J. Darl. | Mentzelia multiflora var. longiloba | Loasaceae
|
| MELU4 | Mentzelia lutea Greene | Mentzelia chrysantha | Loasaceae
|
| MEMA5 | Mentzelia marginata (Osterhout) H.J. Thompson & Prigge | Colorado blazingstar | Loasaceae
|
| MEME | Mentzelia mexicana H.J. Thompson & Zavortink | Mexican blazingstar | Loasaceae
|
| MEMI3 | Mentzelia micrantha (Hook. & Arn.) Torr. & Gray | San Luis blazingstar | Loasaceae
|
| MEMO3 | Mentzelia mojavensis H.J. Thompson & Roberts | Mentzelia albicaulis | Loasaceae
|
| MEMO2 | Mentzelia mollis M.E. Peck | soft blazingstar | Loasaceae
|
| MEMO4 | Mentzelia montana (A. Davids.) A. Davids. | variegated-bract blazingstar | Loasaceae
|
| MEMUL | Mentzelia multicaulis (Osterhout) A. Nels. ex J. Darl. var. librina Thorne & F.G. Sm. | manystem blazingstar | Loasaceae
|
| MEMUM | Mentzelia multicaulis (Osterhout) A. Nels. ex J. Darl. var. multicaulis | manystem blazingstar | Loasaceae
|
| MEMU2 | Mentzelia multicaulis (Osterhout) A. Nels. ex J. Darl. | manystem blazingstar | Loasaceae
|
| MEMUL3 | Mentzelia multiflora (Nutt.) Gray ssp. longiloba (J. Darl.) Felger | Mentzelia multiflora var. longiloba | Loasaceae
|
| MEMUI | Mentzelia multiflora (Nutt.) Gray var. integra M.E. Jones | Adonis blazingstar | Loasaceae
|
| MEMUL2 | Mentzelia multiflora (Nutt.) Gray var. longiloba (J. Darl.) Kartesz, comb. nov. ined. | Adonis blazingstar | Loasaceae
|
| MEMUM2 | Mentzelia multiflora (Nutt.) Gray var. multiflora | Adonis blazingstar | Loasaceae
|
| MEMU3 | Mentzelia multiflora (Nutt.) Gray | Adonis blazingstar | Loasaceae
|
| MENIJ | Mentzelia nitens Greene var. jonesii (Urban & Gilg) J. Darl. | Mentzelia jonesii | Loasaceae
|
| MENIL | Mentzelia nitens Greene var. leptocaulis J. Darl. | shining blazingstar | Loasaceae
|
| MENIN | Mentzelia nitens Greene var. nitens | shining blazingstar | Loasaceae
|
| MENI2 | Mentzelia nitens Greene | shining blazingstar | Loasaceae
|
| MENUN | Mentzelia nuda (Pursh) Torr. & Gray var. nuda | bractless blazingstar | Loasaceae
|
| MENUR | Mentzelia nuda (Pursh) Torr. & Gray var. rusbyi (Woot.) Harrington | Mentzelia rusbyi | Loasaceae
|
| MENUS | Mentzelia nuda (Pursh) Torr. & Gray var. stricta (Osterhout) Harrington | bractless blazingstar | Loasaceae
|
| MENU | Mentzelia nuda (Pursh) Torr. & Gray | bractless blazingstar | Loasaceae
|
| MEOB3 | Mentzelia obscura H.J. Thompson & Roberts | Pacific blazingstar | Loasaceae
|
| MEOL | Mentzelia oligosperma Nutt. ex Sims | chickenthief | Loasaceae
|
| MEOR3 | Mentzelia oreophila J. Darl. | Argus blazingstar | Loasaceae
|
| MEPA4 | Mentzelia pachyrhiza I.M. Johnston | Coahuila blazingstar | Loasaceae
|
| MEPA5 | Mentzelia packardiae Glad. | Packard's blazingstar | Loasaceae
|
| MEPE4 | Mentzelia pectinata Kellogg | San Joaquin blazingstar | Loasaceae
|
| MEPE6 | Mentzelia perennis Woot. | perennial blazingstar | Loasaceae
|
| MEPI3 | Mentzelia pinetorum Heller | Mentzelia dispersa var. obtusa | Loasaceae
|
| MEPO2 | Mentzelia polita A. Nels. | polished blazingstar | Loasaceae
|
| MEPT | Mentzelia pterosperma Eastw. | wingseed blazingstar | Loasaceae
|
| MEPU2 | Mentzelia puberula J. Darl. | Mentzelia oreophila | Loasaceae
|
| MEPUI | Mentzelia pumila Nutt. ex Torr. & Gray var. integra (M.E. Jones) Kearney & Peebles | Mentzelia multiflora var. integra | Loasaceae
|
| MEPUL | Mentzelia pumila Nutt. ex Torr. & Gray var. lagarosa Thorne | dwarf mentzelia | Loasaceae
|
| MEPUM | Mentzelia pumila Nutt. ex Torr. & Gray var. multiflora (Nutt.) Urban & Gilg | Mentzelia multiflora var. multiflora | Loasaceae
|
| MEPUP2 | Mentzelia pumila Nutt. ex Torr. & Gray var. procera (Woot. & Standl.) J. Darl. | Mentzelia pumila var. pumila | Loasaceae
|
| MEPUP | Mentzelia pumila Nutt. ex Torr. & Gray var. pumila | dwarf mentzelia | Loasaceae
|
| MEPU3 | Mentzelia pumila Nutt. ex Torr. & Gray | dwarf mentzelia | Loasaceae
|
| MERA | Mentzelia ravenii H.J. Thompson & Roberts | Mentzelia gracilenta | Loasaceae
|
| MERE | Mentzelia reflexa Coville | reflexed blazingstar | Loasaceae
|
| MERE2 | Mentzelia reverchonii (Urban & Gilg) H.J. Thompson & Zavortink | Reverchon's blazingstar | Loasaceae
|
| MERU | Mentzelia rusbyi Woot. | Rusby's blazingstar | Loasaceae
|
| MESA2 | Mentzelia saxicola H.J. Thompson & Zavortink | El Paso blazingstar | Loasaceae
|
| MESH | Mentzelia shultziorum Prigge | Shultz's blazingstar | Loasaceae
|
| MESI | Mentzelia sinuata (Rydb.) R.J. Hill | leechleaf blazingstar | Loasaceae
|
| MESP4 | Mentzelia speciosa Osterhout | jeweled blazingstar | Loasaceae
|
| MESP5 | Mentzelia springeri (Standl.) Tidestrom | Santa Fe blazingstar | Loasaceae
|
| MEST4 | Mentzelia stricta (Osterhout) G.W. Stevens ex Jeffs & Little | Mentzelia nuda var. stricta | Loasaceae
|
| MEST3 | Mentzelia strictissima (Woot. & Standl.) J. Darl. | grassland blazingstar | Loasaceae
|
| METE | Mentzelia texana Urban & Gilg | Texas blazingstar | Loasaceae
|
| METH | Mentzelia thompsonii Glad. | Mentzelia humilis | Loasaceae
|
| METOA | Mentzelia torreyi Gray var. acerosa (M.E. Jones) Barneby | Torrey's blazingstar | Loasaceae
|
| METOT | Mentzelia torreyi Gray var. torreyi | Torrey's blazingstar | Loasaceae
|
| METO2 | Mentzelia torreyi Gray | Torrey's blazingstar | Loasaceae
|
| METRB | Mentzelia tricuspis Gray var. brevicornuta I.M. Johnston | Mentzelia tridentata | Loasaceae
|
| METR2 | Mentzelia tricuspis Gray | spinyhair blazingstar | Loasaceae
|
| METR4 | Mentzelia tridentata (A. Davids.) H.J. Thompson & Roberts | threetooth blazingstar | Loasaceae
|
| MEVE5 | Mentzelia veatchiana Kellogg | Veatch's blazingstar | Loasaceae
|
| MENTZ | Mentzelia L. | blazingstar | Loasaceae
|
| METRM | Menyanthes trifoliata L. var. minor Raf. | Menyanthes trifoliata | Menyanthaceae
|
| METR3 | Menyanthes trifoliata L. | buckbean | Menyanthaceae
|
| MENYA | Menyanthes L. | buckbean | Menyanthaceae
|
| MEFEG | Menziesia ferruginea Sm. ssp. glabella (Gray) Calder & Taylor | Menziesia ferruginea | Ericaceae
|
| MEFEG2 | Menziesia ferruginea Sm. var. glabella (Gray) M.E. Peck | Menziesia ferruginea | Ericaceae
|
| MEFE | Menziesia ferruginea Sm. | rusty menziesia | Ericaceae
|
| MEGL2 | Menziesia glabella Gray | Menziesia ferruginea | Ericaceae
|
| MEPI2 | Menziesia pilosa (Michx. ex Lam.) Juss. ex Pers. | minniebush | Ericaceae
|
| MENZI | Menziesia Sm. | menziesia | Ericaceae
|
| MELA12 | Merceya latifolia Kindb. in Mac. | Crumia latifolia | Pottiaceae
|
| MELIB | Merceya ligulata (Spruce) Schimp. var. bartramii Bauer | Scopelophila ligulata | Pottiaceae
|
| MELI12 | Merceya ligulata (Spruce) Schimp. | Scopelophila ligulata | Pottiaceae
|
| MEPH | Merckia physodes (Fisch. ex Ser.) Cham. & Schlecht. | Wilhelmsia physodes | Caryophyllaceae
|
| MEAN | Mercurialis annua L. | annual mercury | Euphorbiaceae
|
| MERCU | Mercurialis L. | mercurialis | Euphorbiaceae
|
| MECA11 | Meriolix capillifolia (Scheele) Small | Calylophus berlandieri ssp. pinifolius | Onagraceae
|
| MEHI5 | Meriolix hillii Small | Calylophus berlandieri ssp. pinifolius | Onagraceae
|
| MEIN8 | Meriolix intermedia Rydb. ex Small | Calylophus serrulatus | Onagraceae
|
| MEME2 | Meriolix melanoglottis Rydb. ex Small | Calylophus berlandieri ssp. pinifolius | Onagraceae
|
| MEOB5 | Meriolix oblanceolata Rydb. | Calylophus serrulatus | Onagraceae
|
| MESE5 | Meriolix serrulata (Nutt.) Walp. | Calylophus serrulatus | Onagraceae
|
| MECO13 | Merismatium coccisporum (Norman) Vouaux | | Verrucariaceae
|
| MEDE12 | Merismatium decolorans (Rehm ex Arnold) Triebel | | Verrucariaceae
|
| MERIS | Merismatium Zopf | merismatium | Verrucariaceae
|
| MEAE | Merremia aegyptia (L.) Urban | hairy woodrose | Convolvulaceae
|
| MECI5 | Merremia cissoides (Lam.) Hallier f. | roadside woodrose | Convolvulaceae
|
| MEDI2 | Merremia dissecta (Jacq.) Hallier f. | noyau vine | Convolvulaceae
|
| MEQU2 | Merremia quinquefolia (L.) Hallier f. | rock rosemary | Convolvulaceae
|
| METRA | Merremia tridentata (L.) Hallier f. ssp. angustifolia (Jacq.) van Ooststr. | Xenostegia tridentata | Convolvulaceae
|
| METR6 | Merremia tridentata (L.) Hallier f. | Xenostegia tridentata | Convolvulaceae
|
| METU2 | Merremia tuberosa (L.) Rendle | Spanish arborvine | Convolvulaceae
|
| MEUM | Merremia umbellata (L.) Hallier f. | hogvine | Convolvulaceae
|
| MERRE | Merremia Dennst. ex Endl. | woodrose | Convolvulaceae
|
| MEME12 | Merrilliodendron megacarpum (Hemsley) Sleumer | | Icacinaceae
|
| MERRI | Merrilliodendron Kanehira | | Icacinaceae
|
| MEAL9 | Mertensia alaskana Britt. | Mertensia paniculata var. alaskana | Boraginaceae
|
| MEAL7 | Mertensia alpina (Torr.) G. Don | alpine bluebells | Boraginaceae
|
| MEARG3 | Mertensia arizonica Greene var. grahamii L.O. Williams | Mertensia arizonica | Boraginaceae
|