| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| MEARS | Mertensia arizonica Greene var. subnuda (J.F. Macbr.) L.O. Williams | Mertensia arizonica | Boraginaceae
|
| MEAR6 | Mertensia arizonica Greene | aspen bluebells | Boraginaceae
|
| MEBAO | Mertensia bakeri Greene var. osterhoutii L.O. Williams | Mertensia oblongifolia | Boraginaceae
|
| MEBA | Mertensia bakeri Greene | Mertensia oblongifolia | Boraginaceae
|
| MEBE | Mertensia bella Piper | beautiful bluebells | Boraginaceae
|
| MEBR | Mertensia brevistyla S. Wats. | shortstyle bluebells | Boraginaceae
|
| MECA6 | Mertensia campanulata A. Nels. | Idaho bluebells | Boraginaceae
|
| MECIC2 | Mertensia ciliata (James ex Torr.) G. Don var. ciliata | tall fringed bluebells | Boraginaceae
|
| MECIL | Mertensia ciliata (James ex Torr.) G. Don var. latiloba L.O. Williams | Mertensia ciliata var. ciliata | Boraginaceae
|
| MECIS | Mertensia ciliata (James ex Torr.) G. Don var. stomatechoides (Kellogg) Jepson | tall fringed bluebells | Boraginaceae
|
| MECIS2 | Mertensia ciliata (James ex Torr.) G. Don var. subpubescens (Rydb.) J.F. Macbr. & Payson | Mertensia ciliata var. ciliata | Boraginaceae
|
| MECI3 | Mertensia ciliata (James ex Torr.) G. Don | tall fringed bluebells | Boraginaceae
|
| MECU | Mertensia cusickii Piper | Mertensia oblongifolia | Boraginaceae
|
| MEDR | Mertensia drummondii (Lehm.) G. Don | Drummond's bluebells | Boraginaceae
|
| MEEA | Mertensia eastwoodiae J.F. Macbr. | Mertensia paniculata var. eastwoodiae | Boraginaceae
|
| MEFR2 | Mertensia franciscana Heller | Franciscan bluebells | Boraginaceae
|
| MEFU2 | Mertensia fusiformis Greene | Mertensia oblongifolia | Boraginaceae
|
| MEHU2 | Mertensia humilis Rydb. | Rocky Mountain bluebells | Boraginaceae
|
| MELAB | Mertensia lanceolata (Pursh) DC. var. brachyloba (Greene) A. Nels. | prairie bluebells | Boraginaceae
|
| MELAC | Mertensia lanceolata (Pursh) DC. var. coriacea (A. Nels.) Higgins & Welsh | prairie bluebells | Boraginaceae
|
| MELAF | Mertensia lanceolata (Pursh) DC. var. fendleri (Gray) Gray | Mertensia oblongifolia | Boraginaceae
|
| MELAL2 | Mertensia lanceolata (Pursh) DC. var. lanceolata | prairie bluebells | Boraginaceae
|
| MELAN4 | Mertensia lanceolata (Pursh) DC. var. nivalis (S. Wats.) Higgins | Mertensia oblongifolia | Boraginaceae
|
| MELAP2 | Mertensia lanceolata (Pursh) DC. var. pubens (J.F. Macbr.) L.O. Williams | Mertensia oblongifolia | Boraginaceae
|
| MELAS2 | Mertensia lanceolata (Pursh) DC. var. secundorum Cockerell | prairie bluebells | Boraginaceae
|
| MELAV2 | Mertensia lanceolata (Pursh) DC. var. viridis A. Nels. | Mertensia oblongifolia | Boraginaceae
|
| MELA3 | Mertensia lanceolata (Pursh) DC. | prairie bluebells | Boraginaceae
|
| MELI9 | Mertensia linearis Greene | Mertensia lanceolata var. lanceolata | Boraginaceae
|
| MELO4 | Mertensia longiflora Greene | small bluebells | Boraginaceae
|
| MEMA2 | Mertensia macdougalii Heller | Macdougal's bluebells | Boraginaceae
|
| MEMAA | Mertensia maritima (L.) S.F. Gray ssp. asiatica Takeda | Mertensia maritima var. asiatica | Boraginaceae
|
| MEMAA2 | Mertensia maritima (L.) S.F. Gray var. asiatica (Takeda) Welsh | oysterleaf | Boraginaceae
|
| MEMAM | Mertensia maritima (L.) S.F. Gray var. maritima | oysterleaf | Boraginaceae
|
| MEMA3 | Mertensia maritima (L.) S.F. Gray | oysterleaf | Boraginaceae
|
| MEOBA | Mertensia oblongifolia (Nutt.) G. Don var. amoena (A. Nels.) L.O. Williams | Mertensia oblongifolia | Boraginaceae
|
| MEOBN | Mertensia oblongifolia (Nutt.) G. Don var. nevadensis (A. Nels.) L.O. Williams | Mertensia oblongifolia | Boraginaceae
|
| MEOB | Mertensia oblongifolia (Nutt.) G. Don | oblongleaf bluebells | Boraginaceae
|
| MEOR5 | Mertensia oreophila L.O. Williams | Mertensia oblongifolia | Boraginaceae
|
| MEPA8 | Mertensia palmeri A. Nels. & J.F. Macbr. | Mertensia paniculata var. paniculata | Boraginaceae
|
| MEPAE2 | Mertensia paniculata (Ait.) G. Don ssp. eastwoodiae (J.F. Macbr.) Welsh | Mertensia paniculata var. eastwoodiae | Boraginaceae
|
| MEPAA | Mertensia paniculata (Ait.) G. Don var. alaskana (Britt.) L.O. Williams | Alaska tall bluebells | Boraginaceae
|
| MEPAB | Mertensia paniculata (Ait.) G. Don var. borealis (J.F. Macbr.) L.O. Williams | northern bluebells | Boraginaceae
|
| MEPAE | Mertensia paniculata (Ait.) G. Don var. eastwoodiae (J.F. Macbr.) Hult�n | Eastwood's bluebells | Boraginaceae
|
| MEPAN | Mertensia paniculata (Ait.) G. Don var. nivalis S. Wats. | Mertensia oblongifolia | Boraginaceae
|
| MEPAP | Mertensia paniculata (Ait.) G. Don var. paniculata | tall bluebells | Boraginaceae
|
| MEPAS | Mertensia paniculata (Ait.) G. Don var. subcordata (Greene) J.F. Macbr. | Mertensia platyphylla var. subcordata | Boraginaceae
|
| MEPA | Mertensia paniculata (Ait.) G. Don | tall bluebells | Boraginaceae
|
| MEPE5 | Mertensia perplexa Rydb. | Mertensia oblongifolia | Boraginaceae
|
| MEPI4 | Mertensia pilosa (Cham.) DC. | Mertensia paniculata var. paniculata | Boraginaceae
|
| MEPLP | Mertensia platyphylla Heller var. platyphylla | broadleaf bluebells | Boraginaceae
|
| MEPLS | Mertensia platyphylla Heller var. subcordata (Greene) L.O. Williams | broadleaf bluebells | Boraginaceae
|
| MEPL | Mertensia platyphylla Heller | broadleaf bluebells | Boraginaceae
|
| METO5 | Mertensia toiyabensis J.F. Macbr. | Mertensia oblongifolia | Boraginaceae
|
| MEUM2 | Mertensia umbratilis Greenm. | shade bluebells | Boraginaceae
|
| MEVI3 | Mertensia virginica (L.) Pers. ex Link | Virginia bluebells | Boraginaceae
|
| MEVIC2 | Mertensia viridis (A. Nels.) A. Nels. var. caelestina (A. Nels. & Cockerell) L.O. Williams | Mertensia oblongifolia | Boraginaceae
|
| MEVIC | Mertensia viridis (A. Nels.) A. Nels. var. cana (Rydb.) L.O. Williams | Mertensia oblongifolia | Boraginaceae
|
| MEVIC3 | Mertensia viridis (A. Nels.) A. Nels. var. cynoglossoides (Greene) J.F. Macbr. | Mertensia oblongifolia | Boraginaceae
|
| MEVID2 | Mertensia viridis (A. Nels.) A. Nels. var. dilata (A. Nels.) L.O. Williams | Mertensia lanceolata var. coriacea | Boraginaceae
|
| MEVIP | Mertensia viridis (A. Nels.) A. Nels. var. parvifolia L.O. Williams | Mertensia oblongifolia | Boraginaceae
|
| MEVI4 | Mertensia viridis (A. Nels.) A. Nels. | Mertensia oblongifolia | Boraginaceae
|
| MERTE | Mertensia Roth | bluebells | Boraginaceae
|
| MEMA16 | Meryta macrophylla Seem. | | Araliaceae
|
| MERYT | Meryta J.R. & G. Forst. | | Araliaceae
|
| MEAT | Mesadenia atriplicifolia (L.) Raf. | Arnoglossum atriplicifolium | Asteraceae
|
| MEDI5 | Mesadenia diversifolia (Torr. & Gray) Greene | Arnoglossum diversifolium | Asteraceae
|
| MEEL4 | Mesadenia elliottii Harper | Arnoglossum ovatum | Asteraceae
|
| MEFL4 | Mesadenia floridana (Gray) Greene | Arnoglossum floridanum | Asteraceae
|
| MELAV | Mesadenia lanceolata (Nutt.) Raf. var. virescens Harper | Arnoglossum ovatum | Asteraceae
|
| MELA11 | Mesadenia lanceolata (Nutt.) Raf. | Arnoglossum ovatum | Asteraceae
|
| MEMA10 | Mesadenia maxima Harper | Arnoglossum ovatum | Asteraceae
|
| MERE5 | Mesadenia reniformis Raf. | Arnoglossum muehlenbergii | Asteraceae
|
| MESU9 | Mesadenia sulcata (Fern.) Harper | Arnoglossum sulcatum | Asteraceae
|
| METU3 | Mesadenia tuberosa (Nutt.) Britt. | Arnoglossum plantagineum | Asteraceae
|
| MELU3 | Mesadenus lucayanus (Britt.) Schlechter | Mesadenus polyanthus | Orchidaceae
|
| MEPO6 | Mesadenus polyanthus (Reichenb. f.) Schlechter | Florida Keys ladies'-tresses | Orchidaceae
|
| MESAD | Mesadenus Schlechter | ladies'-tresses | Orchidaceae
|
| MECH4 | Mesembryanthemum chilense Molina | Carpobrotus chilensis | Aizoaceae
|
| MECO5 | Mesembryanthemum coccineum Haw. | Lampranthus coccineus | Aizoaceae
|
| MECO11 | Mesembryanthemum cordifolium L. f. | Aptenia cordifolia | Aizoaceae
|
| MECR3 | Mesembryanthemum crystallinum L. | common iceplant | Aizoaceae
|
| MEED | Mesembryanthemum edule L. | Carpobrotus edulis | Aizoaceae
|
| MEFL3 | Mesembryanthemum floribundum Haw. | Drosanthemum floribundum | Aizoaceae
|
| MENO2 | Mesembryanthemum nodiflorum L. | slenderleaf iceplant | Aizoaceae
|
| MESP8 | Mesembryanthemum speciosum Haw. | Drosanthemum speciosum | Aizoaceae
|
| MESEM | Mesembryanthemum L. | iceplant | Aizoaceae
|
| MESA13 | Mesoptychia sahlbergii (Lindb. & S. W. Arnell) A. Evans | | Mesoptychiaceae
|
| MESOP | Mesoptychia (Lindb.) A. Evans | | Mesoptychiaceae
|
| MECA10 | Mespilus canescens Phipps | Stern's medlar | Rosaceae
|
| MEGE4 | Mespilus germanica L. | medlar | Rosaceae
|
| MEJA2 | Mespilus japonica Thunb. | Eriobotrya japonica | Rosaceae
|
| MESPI | Mespilus L. | mespilus | Rosaceae
|
| MEAR10 | Messerschmidia argentea (L. f.) Johnston | Tournefortia argentea | Boraginaceae
|
| MESI4 | Messerschmidia sibirica (L.) L. | Argusia sibirica | Boraginaceae
|
| MEKI2 | Mesyniopsis kingii (S. Wats.) W.A. Weber | Linum kingii | Linaceae
|
| MEAL11 | Mesynium alatum (Small) W.A. Weber | Linum alatum | Linaceae
|
| MEAR9 | Mesynium aristatum (Engelm.) W.A. Weber | Linum aristatum | Linaceae
|
| MEAUG | Mesynium australe (Heller) W.A. Weber ssp. glandulosum (Rogers) W.A. Weber | Linum australe var. glandulosum | Linaceae
|
| MEAU2 | Mesynium australe (Heller) W.A. Weber | Linum australe var. australe | Linaceae
|
| MEHU4 | Mesynium hudsonioides (Planch.) W.A. Weber | Linum hudsonioides | Linaceae
|
| MEIM2 | Mesynium imbricatum (Raf.) W.A. Weber | Linum imbricatum | Linaceae
|