| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| MAWA3 | Macronema watsonii (Gray) Greene | Ericameria watsonii | Asteraceae
|
| MAAT80 | Macroptilium atropurpureum (Moc. & Sess� ex DC.) Urban | purple bushbean | Fabaceae
|
| MAGI2 | Macroptilium gibbosifolium (Ortega) A. Delgado | variableleaf bushbean | Fabaceae
|
| MAHER | Macroptilium heterophyllum (Willd.) Mar�chal & Baudet var. rotundifolium (Gray) Mar�chal, Mascherpa & Stanier | Macroptilium gibbosifolium | Fabaceae
|
| MAHE6 | Macroptilium heterophyllum (Willd.) Mar�chal & Baudet | Macroptilium gibbosifolium | Fabaceae
|
| MALAL2 | Macroptilium lathyroides (L.) Urban var. lathyroides | wild bushbean | Fabaceae
|
| MALAS | Macroptilium lathyroides (L.) Urban var. semierectum (L.) Urban | wild bushbean | Fabaceae
|
| MALA9 | Macroptilium lathyroides (L.) Urban | wild bushbean | Fabaceae
|
| MACRO4 | Macroptilium (Benth.) Urban | bushbean | Fabaceae
|
| MAGLL | Macrorhynchus glaucus (Pursh) D.C. Eat. var. laciniatus D.C. Eat. | Agoseris glauca var. laciniata | Asteraceae
|
| MAHE4 | Macrorhynchus heterophyllus Nutt. | Agoseris heterophylla var. heterophylla | Asteraceae
|
| MARE7 | Macrorhynchus retrorsus Benth. | Agoseris retrorsa | Asteraceae
|
| MAVO | Macroscapa volubilis Kellogg | Dichelostemma volubile | Liliaceae
|
| MABR | Macrosiphonia brachysiphon (Torr.) Gray | Huachuca Mountain rocktrumpet | Apocynaceae
|
| MAHY | Macrosiphonia hypoleuca (Benth.) Muell.-Arg. | Davis Mountain rocktrumpet | Apocynaceae
|
| MALAL | Macrosiphonia lanuginosa (Mart. & Gal.) Hemsl. var. lanuginosa | plateau rocktrumpet | Apocynaceae
|
| MALAM | Macrosiphonia lanuginosa (Mart. & Gal.) Hemsl. var. macrosiphon (Torr.) Henrickson, comb. nov. ined. | plateau rocktrumpet | Apocynaceae
|
| MALA7 | Macrosiphonia lanuginosa (Mart. & Gal.) Hemsl. | plateau rocktrumpet | Apocynaceae
|
| MAMA14 | Macrosiphonia macrosiphon (Torr.) Heller | Macrosiphonia lanuginosa var. macrosiphon | Apocynaceae
|
| MACRO2 | Macrosiphonia Muell.-Arg. | rocktrumpet | Apocynaceae
|
| MATO3 | Macrothelypteris torresiana (Gaud.) Ching | swordfern | Thelypteridaceae
|
| MACRO3 | Macrothelypteris (H. It�) Ching | macrothelypteris | Thelypteridaceae
|
| MAAX2 | Macrotyloma axillare (E. Meyer) Verdc. | perennial horsegram | Fabaceae
|
| MAGE2 | Macrotyloma geocarpum (Harms) Marechal & Baudet | geocarpa groundnut | Fabaceae
|
| MAUN4 | Macrotyloma uniflorum (Lam.) Verdc. | horsegram | Fabaceae
|
| MACRO5 | Macrotyloma (Wight & Arnott) Verdc. | macrotyloma | Fabaceae
|
| MACO33 | Macrozamia communis L.A.S. Johnson | burrawong | Zamiaceae
|
| MACRO8 | Macrozamia Miq. | macrozamia | Zamiaceae
|
| MAOB3 | Macuillamia obovata Raf. | Bacopa repens | Scrophulariaceae
|
| MARE10 | Macuillamia repens (Sw.) Pennell | Bacopa repens | Scrophulariaceae
|
| MARO4 | Macuillamia rotundifolia (Michx.) Raf. | Bacopa rotundifolia | Scrophulariaceae
|
| MABU | Madhuca butyracea (Roxb.) J. F. Macbr. | Aesandra butyracea | Sapotaceae
|
| MAIN15 | Madhuca indica J. F. Gmelin | moa tree | Sapotaceae
|
| MALA13 | Madhuca latifolia (Roxb.) J. F. Macbr. | Madhuca indica | Sapotaceae
|
| MALO5 | Madhuca longifolia (J. Konig) J. F. Macbr. | mahua | Sapotaceae
|
| MADHU | Madhuca Buch.-Ham. ex J. F. Gmelin | madhuca | Sapotaceae
|
| MAAN2 | Madia anomala Greene | plumpseeded madia | Asteraceae
|
| MABO | Madia bolanderi (Gray) Gray | Bolander's madia | Asteraceae
|
| MACA10 | Madia capitata Nutt. | Madia sativa | Asteraceae
|
| MACI | Madia citrigracilis Keck | Shasta tarweed | Asteraceae
|
| MACI2 | Madia citriodora Greene | lemonscented madia | Asteraceae
|
| MADI8 | Madia dissitiflora (Nutt.) Torr. & Gray | Madia gracilis | Asteraceae
|
| MADO3 | Madia doris-nilesiae T.W. & J.P. Nelson | serpentine tarweed | Asteraceae
|
| MAELD | Madia elegans D. Don ex Lindl. ssp. densifolia (Greene) Keck | showy tarweed | Asteraceae
|
| MAELE | Madia elegans D. Don ex Lindl. ssp. elegans | common madia | Asteraceae
|
| MAELV | Madia elegans D. Don ex Lindl. ssp. vernalis Keck | spring madia | Asteraceae
|
| MAELW | Madia elegans D. Don ex Lindl. ssp. wheeleri (Gray) Keck | Wheeler's tarweed | Asteraceae
|
| MAELD2 | Madia elegans D. Don ex Lindl. var. densifolia (Greene) Jepson | Madia elegans ssp. densifolia | Asteraceae
|
| MAEL | Madia elegans D. Don ex Lindl. | common madia | Asteraceae
|
| MAEX | Madia exigua (Sm.) Gray | small tarweed | Asteraceae
|
| MAGL2 | Madia glomerata Hook. | mountain tarweed | Asteraceae
|
| MAGRC | Madia gracilis (Sm.) Keck & J. Clausen ex Applegate ssp. collina Keck | Madia gracilis | Asteraceae
|
| MAGRP | Madia gracilis (Sm.) Keck & J. Clausen ex Applegate ssp. pilosa Keck | Madia gracilis | Asteraceae
|
| MAGR3 | Madia gracilis (Sm.) Keck & J. Clausen ex Applegate | grassy tarweed | Asteraceae
|
| MAHA | Madia hallii Keck | Hall's madia | Asteraceae
|
| MAMA | Madia madioides (Nutt.) Greene | woodland madia | Asteraceae
|
| MAMI | Madia minima (Gray) Keck | oppositeleaved tarweed | Asteraceae
|
| MANU | Madia nutans (Greene) Keck | nodding madia | Asteraceae
|
| MARA | Madia radiata Kellogg | golden madia | Asteraceae
|
| MARA2 | Madia rammii Greene | Ramm's madia | Asteraceae
|
| MASAC2 | Madia sativa Molina ssp. capitata (Nutt.) Piper | Madia sativa | Asteraceae
|
| MASAC3 | Madia sativa Molina var. congesta Torr. & Gray | Madia sativa | Asteraceae
|
| MASA | Madia sativa Molina | coast tarweed | Asteraceae
|
| MAST3 | Madia stebbinsii T.W. & J.P. Nelson | Stebbins' tarweed | Asteraceae
|
| MASU | Madia subspicata Keck | slender tarweed | Asteraceae
|
| MAYO | Madia yosemitana Parry ex Gray | Yosemite tarweed | Asteraceae
|
| MADIA | Madia Molina | tarweed | Asteraceae
|
| MASU17 | Maerua subcordata (Gilg.) DeWolf | | Capparaceae
|
| MAERU | Maerua Forsk. | maerua | Capparaceae
|
| MACA23 | Maesa carolinensis Mez | | Myrsinaceae
|
| MAESA | Maesa Forsk. | | Myrsinaceae
|
| MAEM2 | Maesopsis eminii Engl. | umbrella-tree | Rhamnaceae
|
| MAESO | Maesopsis Engl. | umbrella-tree | Rhamnaceae
|
| MAACC2 | Magnolia acuminata (L.) L. var. cordata (Michx.) Ser. | Magnolia acuminata | Magnoliaceae
|
| MAACO | Magnolia acuminata (L.) L. var. ozarkensis Ashe | Magnolia acuminata | Magnoliaceae
|
| MAACS | Magnolia acuminata (L.) L. var. subcordata (Spach) Dandy | Magnolia acuminata | Magnoliaceae
|
| MAAC | Magnolia acuminata (L.) L. | cucumber-tree | Magnoliaceae
|
| MAAS | Magnolia ashei Weatherby | Ashe's magnolia | Magnoliaceae
|
| MACO23 | Magnolia cordata Michx. | Magnolia acuminata | Magnoliaceae
|
| MADE6 | Magnolia dealbata Zucc. | cloudforest magnolia | Magnoliaceae
|
| MADE7 | Magnolia denudata Desr. | lilytree | Magnoliaceae
|
| MAFR | Magnolia fraseri Walt. | mountain magnolia | Magnoliaceae
|
| MAGR4 | Magnolia grandiflora L. | southern magnolia | Magnoliaceae
|
| MAMAA2 | Magnolia macrophylla Michx. ssp. ashei (Weatherby) Spongberg | Magnolia ashei | Magnoliaceae
|
| MAMAA3 | Magnolia macrophylla Michx. var. ashei (Weatherby) D.L. Johnson | Magnolia ashei | Magnoliaceae
|
| MAMA2 | Magnolia macrophylla Michx. | bigleaf magnolia | Magnoliaceae
|
| MAPO2 | Magnolia portoricensis Bello | Puerto Rico magnolia | Magnoliaceae
|
| MAPY | Magnolia pyramidata Bartr. | pyramid magnolia | Magnoliaceae
|
| MASO9 | Magnolia �soulangiana Soul.-Bod. | Chinese magnolia | Magnoliaceae
|
| MASP | Magnolia splendens Urban | laurel magnolia | Magnoliaceae
|
| MAST6 | Magnolia stellata (Sieb. & Zucc.) Maxim. | star magnolia | Magnoliaceae
|
| MATR | Magnolia tripetala (L.) L. | umbrella-tree | Magnoliaceae
|
| MAVIA2 | Magnolia virginiana L. var. australis Sarg. | Magnolia virginiana | Magnoliaceae
|
| MAVIP | Magnolia virginiana L. var. parva Ashe | Magnolia virginiana | Magnoliaceae
|
| MAVIT2 | Magnolia virginiana L. var. tripetala L. | Magnolia tripetala | Magnoliaceae
|
| MAVI2 | Magnolia virginiana L. | sweetbay | Magnoliaceae
|
| MAGNO | Magnolia L. | magnolia | Magnoliaceae
|
| MAAM5 | Mahonia amplectens Eastw. | Mahonia repens | Berberidaceae
|
| MAAQ2 | Mahonia aquifolium (Pursh) Nutt. | hollyleaved barberry | Berberidaceae
|
| MABE2 | Mahonia bealei (Fortune) Carr. | Beale's barberry | Berberidaceae
|
| MACA11 | Mahonia californica (Jepson) Ahrendt | Mahonia dictyota | Berberidaceae
|