| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| MAINS | Malacothrix incana (Nutt.) Torr. & Gray var. succulenta (Elmer) E. Williams | Malacothrix incana | Asteraceae
|
| MAIN | Malacothrix incana (Nutt.) Torr. & Gray | dunedelion | Asteraceae
|
| MAIN2 | Malacothrix indecora Greene | Santa Cruz Island desertdandelion | Asteraceae
|
| MAINS2 | Malacothrix insularis Greene var. squalida (Greene) Ferris | Malacothrix squalida | Asteraceae
|
| MAIN7 | Malacothrix intermedia W.S. Davis, sp. nov. ined. | intermediate desertdandelion | Asteraceae
|
| MAJU2 | Malacothrix junakii W.S. Davis | Junak's desertdandelion | Asteraceae
|
| MAOB5 | Malacothrix obtusa Benth. | Malacothrix floccifera | Asteraceae
|
| MAPA12 | Malacothrix parviflora Benth. | Malacothrix floccifera | Asteraceae
|
| MAPH3 | Malacothrix phaeocarpa W.S. Davis | Davis' desertdandelion | Asteraceae
|
| MAPL3 | Malacothrix platyphylla Gray | Atrichoseris platyphylla | Asteraceae
|
| MASAA2 | Malacothrix saxatilis (Nutt.) Torr. & Gray var. altissima (Greene) Ferris | Malacothrix saxatilis var. tenuifolia | Asteraceae
|
| MASAA | Malacothrix saxatilis (Nutt.) Torr. & Gray var. arachnoidea (McGregor) E. Williams | cliff desertdandelion | Asteraceae
|
| MASAC | Malacothrix saxatilis (Nutt.) Torr. & Gray var. commutata (Torr. & Gray) Ferris | cliff desertdandelion | Asteraceae
|
| MASAI | Malacothrix saxatilis (Nutt.) Torr. & Gray var. implicata (Eastw.) Hall | cliff desertdandelion | Asteraceae
|
| MASAS | Malacothrix saxatilis (Nutt.) Torr. & Gray var. saxatilis | cliff desertdandelion | Asteraceae
|
| MASAT | Malacothrix saxatilis (Nutt.) Torr. & Gray var. tenuifolia (Nutt.) Gray | cliff desertdandelion | Asteraceae
|
| MASAT2 | Malacothrix saxatilis (Nutt.) Torr. & Gray var. tenuissima Munz | Malacothrix saxatilis var. tenuifolia | Asteraceae
|
| MASA2 | Malacothrix saxatilis (Nutt.) Torr. & Gray | cliff desertdandelion | Asteraceae
|
| MASE5 | Malacothrix senecioides Reiche | Malacothrix floccifera | Asteraceae
|
| MASI5 | Malacothrix similis W.S. Davis & Raven | twin desertdandelion | Asteraceae
|
| MASOT | Malacothrix sonchoides (Nutt.) Torr. & Gray var. torreyi (Gray) E. Williams | Malacothrix torreyi | Asteraceae
|
| MASO | Malacothrix sonchoides (Nutt.) Torr. & Gray | sowthistle desertdandelion | Asteraceae
|
| MASO6 | Malacothrix sonorae W.S. Davis & Raven | Sonoran desertdandelion | Asteraceae
|
| MASQ | Malacothrix squalida Greene | Santa Cruz desertdandelion | Asteraceae
|
| MAST2 | Malacothrix stebbinsii W.S. Davis & Raven | Stebbins' desertdandelion | Asteraceae
|
| MASU10 | Malacothrix succulenta Elmer | Malacothrix incana | Asteraceae
|
| MATE13 | Malacothrix tenuifolia (Nutt.) Torr. & Gray | Malacothrix saxatilis var. tenuifolia | Asteraceae
|
| MATO2 | Malacothrix torreyi Gray | Torrey's desertdandelion | Asteraceae
|
| MALAC3 | Malacothrix DC. | desertdandelion | Asteraceae
|
| MABA6 | Malaxis bayardii Fern. | Bayard's adder's-mouth orchid | Orchidaceae
|
| MABR5 | Malaxis brachypoda (Gray) Fern. | white adder's-mouth orchid | Orchidaceae
|
| MACO4 | Malaxis corymbosa (S. Wats.) Kuntze | Huachuca Mountain adder's-mouth orchid | Orchidaceae
|
| MADI5 | Malaxis diphyllos Cham. | Aleutian adder's-mouth orchid | Orchidaceae
|
| MAEH | Malaxis ehrenbergii (Reichenb. f.) Kuntze | Ehrenberg's adder's-mouth orchid | Orchidaceae
|
| MAFL7 | Malaxis floridana (Chapman) Kuntze | Malaxis spicata | Orchidaceae
|
| MAMA13 | Malaxis macrostachya (Lex.) Kuntze | Chiricahua adder's-mouth orchid | Orchidaceae
|
| MAMA22 | Malaxis major (Reichenb. f.) L�on ex A.D. Hawkes | royal adder's-mouth orchid | Orchidaceae
|
| MAMA36 | Malaxis massonii (Ridley) Kuntze | | Orchidaceae
|
| MAMOB2 | Malaxis monophyllos (L.) Sw. ssp. brachypoda (Gray) A.& D. L�ve | Malaxis brachypoda | Orchidaceae
|
| MAMOB | Malaxis monophyllos (L.) Sw. var. brachypoda (Gray) F. Morris & Eames | Malaxis brachypoda | Orchidaceae
|
| MAMOD | Malaxis monophyllos (L.) Sw. var. diphyllos (Cham.) Luer | Malaxis diphyllos | Orchidaceae
|
| MAPA4 | Malaxis paludosa (L.) Sw. | bog adder's-mouth orchid | Orchidaceae
|
| MAPO15 | Malaxis porphyrea (Ridley) Kuntze | | Orchidaceae
|
| MASO8 | Malaxis soulei L.O. Williams | Malaxis macrostachya | Orchidaceae
|
| MASP2 | Malaxis spicata Sw. | Florida adder's-mouth orchid | Orchidaceae
|
| MATE2 | Malaxis tenuis (S. Wats.) Ames | Arizona adder's-mouth orchid | Orchidaceae
|
| MAUN | Malaxis unifolia Michx. | green adder's-mouth orchid | Orchidaceae
|
| MAWE | Malaxis wendtii Salazar | Wendt's adder's-mouth orchid | Orchidaceae
|
| MALAX | Malaxis Soland. ex Sw. | adder's-mouth orchid | Orchidaceae
|
| MAAF | Malcolmia africana (L.) Ait. f. | African mustard | Brassicaceae
|
| MAMA4 | Malcolmia maritima (L.) Ait. f. | Virginia stock | Brassicaceae
|
| MALCO2 | Malcolmia Ait. f. | malcolmia | Brassicaceae
|
| MACR3 | Malephora crocea (Jacq.) Schwant. | coppery mesemb | Aizoaceae
|
| MALEP | Malephora N.E. Br. | malephora | Aizoaceae
|
| MAGN | Mallotonia gnaphalodes (L.) Britt. | Argusia gnaphalodes | Boraginaceae
|
| MAPH4 | Mallotus philippensis (Lam.) Muell.-Arg. | kamala tree | Euphorbiaceae
|
| MALLO | Mallotus Lour. | mallotus | Euphorbiaceae
|
| MALA6 | Malosma laurina (Nutt.) Nutt. ex Abrams | laurel sumac | Anacardiaceae
|
| MALOS2 | Malosma Nutt. ex Abrams | laurel sumac | Anacardiaceae
|
| MATE3 | Malperia tenuis S. Wats. | brownturbans | Asteraceae
|
| MALPE | Malperia S. Wats. | malperia | Asteraceae
|
| MAAN12 | Malpighia angustifolia L. | Malpighia linearis | Malpighiaceae
|
| MACO11 | Malpighia coccigera L. | Singapore holly | Malpighiaceae
|
| MACR5 | Malpighia crassifolia L. | Byrsonima crassifolia | Malpighiaceae
|
| MAEM | Malpighia emarginata Sess� & Moc. ex DC. | Barbados cherry | Malpighiaceae
|
| MAFU2 | Malpighia fucata Ker-Gawl. | palo bronco | Malpighiaceae
|
| MAGL6 | Malpighia glabra L. | wild crapemyrtle | Malpighiaceae
|
| MAGL9 | Malpighia glabra auct. non L. | Malpighia emarginata | Malpighiaceae
|
| MAIN5 | Malpighia infestissima L.C. Rich. ex Niedenzu | cowhage cherry | Malpighiaceae
|
| MAIN13 | Malpighia infestissima auct. non L.C. Rich. ex Niedenzu | Malpighia woodburyana | Malpighiaceae
|
| MALI2 | Malpighia linearis Jacq. | bastard cherry | Malpighiaceae
|
| MAPA13 | Malpighia pallens Small | Malpighia infestissima | Malpighiaceae
|
| MAPU10 | Malpighia punicifolia auct. non L. | Malpighia emarginata | Malpighiaceae
|
| MASE | Malpighia setosa Spreng. | bristly stingingbush | Malpighiaceae
|
| MASH3 | Malpighia shaferi Britt. & Wilson ex Britt. | Malpighia fucata | Malpighiaceae
|
| MASP5 | Malpighia spicata Cav. | Byrsonima spicata | Malpighiaceae
|
| MATH2 | Malpighia thompsonii Britt. & Wilson | Malpighia infestissima | Malpighiaceae
|
| MAWO | Malpighia woodburyana Vivaldi | Woodbury's stingingbush | Malpighiaceae
|
| MALPI | Malpighia L. | malpighia | Malpighiaceae
|
| MAANA | Malus angustifolia (Ait.) Michx. var. angustifolia | southern crabapple | Rosaceae
|
| MAANP | Malus angustifolia (Ait.) Michx. var. puberula Rehd. | southern crabapple | Rosaceae
|
| MAAN3 | Malus angustifolia (Ait.) Michx. | southern crabapple | Rosaceae
|
| MAAR7 | Malus �arnoldiana (Rehd.) Rehd. | | Rosaceae
|
| MABAM2 | Malus bacata (L.) Borkh. ssp. mandshurica (Maxim.) C.K. Schneid. | Malus mandshurica | Rosaceae
|
| MABA | Malus baccata (L.) Borkh. | Siberian crabapple | Rosaceae
|
| MABR6 | Malus bracteata (Bailey) Rehd. | Malus coronaria var. coronaria | Rosaceae
|
| MACO21 | Malus communis Poir. | Malus pumila | Rosaceae
|
| MACOC2 | Malus coronaria (L.) P. Mill. var. coronaria | sweet crabapple | Rosaceae
|
| MACOD | Malus coronaria (L.) P. Mill. var. dasycalyx Rehd. | sweet crabapple | Rosaceae
|
| MACOE | Malus coronaria (L.) P. Mill. var. elongata Rehd. | Malus coronaria var. coronaria | Rosaceae
|
| MACOL | Malus coronaria (L.) P. Mill. var. lancifolia (Rehd.) C.F. Reed | Malus coronaria var. dasycalyx | Rosaceae
|
| MACO5 | Malus coronaria (L.) P. Mill. | sweet crabapple | Rosaceae
|
| MADA5 | Malus �dawsoniana Rehd. | | Rosaceae
|
| MADI10 | Malus diversifolia (Bong.) M. Roemer | Malus fusca | Rosaceae
|
| MADO4 | Malus domestica (Borkh.) Borkh. | Malus pumila | Rosaceae
|
| MAFL80 | Malus floribunda Sieb. ex Van Houtte | Japanese flowering crabapple | Rosaceae
|
| MAFUL | Malus fusca (Raf.) Schneid. var. levipes (Nutt.) Schneid. | Malus fusca | Rosaceae
|
| MAFU | Malus fusca (Raf.) Schneid. | Oregon crabapple | Rosaceae
|
| MAGL4 | Malus glabrata Rehd. | Biltmore crabapple | Rosaceae
|
| MAGL11 | Malus glaucescens Rehd. | Dunbar crabapple | Rosaceae
|
| MAIOB | Malus ioensis (Wood) Britt. var. bushii Rehd. | Malus ioensis var. ioensis | Rosaceae
|