Complete list of species
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| scientific name | common name(s) | image gallery |
| Mammillaria heyderi var. heyderi | Little Nipple Cactus | |
| Mammillaria heyderi var. macdougalii | Cream Cactus Macdougal's Nipple Cactus | |
| Mammillaria lasiacantha | Lacespine Nipple Cactus | |
| Mammillaria mainiae | Counterclockwise Fishhook Cactus Counterclockwise Nipple Cactus | |
| Mammillaria meiacantha | Little Nipple Cactus | |
| Mammillaria pottsii | Rat-tail Nipple Cactus | |
| Mammillaria prolifera | Texas Nipple Cactus | |
| Mammillaria prolifera var. texana | Texas Nipple Cactus | |
| Mammillaria sphaerica | Longmamma Nipple Cactus | |
| Mammillaria tetrancistra | California Pincushion Common Fish Hook Cactus Common Fishhook Cactus | |
| Mammillaria thornberi | Clustered Fishhook Clustered Pincushion Thornber's Fishhook Thornber's Nipple Cactus | |
| Mammillaria wrightii | Wright's Nipple Cactus Wright’s Fishhook Cactus Wright’s Pincushion | |
| Mammillaria wrightii var. wilcoxii | Wilcox's Nipple Cactus Wilcox’s Fishhook Cactus Wilcox’s Pincushion | |
| Mammillaria wrightii var. wrightii | Wright's Nipple Cactus Wright’s Fishhook Cactus Wright’s Pincushion | |
| Mancoa pubens | Trans-pecos Cress Transpecos Cress | |
| Mandevilla brachysiphon | Huachuca Mountain Rocktrumpet | |
| Mandevilla hypoleuca | Davis Mountain Rocktrumpet | |
| Mandevilla lanuginosa | Plateau Rocktrumpet | |
| Mandevilla macrosiphon | Plateau Rocktrumpet Longtube Trumpet Flower Flor De San Juan Rock Trumpet | |
| Manfreda longiflora | Longflower Tuberose Amole De RãO Runyon's Huaco | |
| Manfreda maculosa | False Aloe Spice Lily Spice-lily | |
| Manfreda sileri | Siler's Tuberose | |
| Manfreda variegata | Mottled Tuberose Huaco Texas Tuberose | |
| Manfreda virginica | False Aloe Rattlesnake Master | |
| Manihot angustiloba | Desert Mountain Manihot Desertmountain Manihot Narrow-leaf Cassava Narrow-leaved Cassava | |
| Manihot davisiae | Arizona Manihot Arizona Cassava Pata de Gallo | |
| Manihot subspicata | Palo Mulato Spiked Manihot | |
| Manihot walkerae | Walker's Manioc Walker's Manihot Texas Tapioca | |
| Manilkara jaimiqui | Wild Dilly | |
| Manilkara jaimiqui ssp. emarginata | Wild Dilly | |
| Marah fabaceus | California Manroot | |
| Marah fabaceus var. agrestis | California Man-root California Manroot | |
| Marah fabaceus var. fabaceus | California Man-root California Manroot | |
| Marah gilensis | Gila Manroot Wild Cucumber | |
| Marah horridus | Sierra Man-root Sierra Manroot Sierran Manroot | |
| Marah macrocarpus | Chilicothe Cucamonga Manroot Large-fruited Manroot | |
| Marah macrocarpus var. macrocarpus | Cucamonga Manroot | |
| Marah macrocarpus var. major | Cucamonga Manroot Island Manroot | |
| Marah macrocarpus var. micranthus | Cucamonga Manroot | |
| Marah oreganus | Coastal Manroot Western Wild Cucumber | |
| Marah watsonii | Taw Manroot Watson's Wild Cucumber | |
| Marattia douglasii | Hawaii Potato Fern Pala Kapua Ilio | |
| Margaranthus solanaceus | Netted Globe-cherry Netted Globeberry Netted Globecherry | |
| Marina calycosa | San Pedro False Prairie-clover | |
| Marina diffusa | Spreading False Prairie-clover | |
| Marina orcuttii | Sonoran False Prairie-clover | |
| Marina parryi | Parry's False Prairie-clover | |
| Mariosousa millefolia | Milfoil Wattle | |
| Marshallia caespitosa | Barbara's-buttons Puffballs White Barbara's-buttons Barbara's Buttons | |
| Marshallia caespitosa var. caespitosa | Barbara's Buttons Puffballs | |
| Marshallia caespitosa var. signata | Marked Barbara's-buttons Marked Barbara's Buttons Puffballs | |
| Marshallia graminifolia | Grassleaf Barbara's Buttons | |
| Marshallia graminifolia var. cynanthera | Grassleaf Barbara's Buttons | |
| Marshallia graminifolia var. graminifolia | Grassleaf Barbara's Buttons | |
| Marshallia grandiflora | Monongahela Barbara's Buttons Large-flowered Marshallia | |
| Marshallia legrandii | Tall Barbara's Buttons LeGrand's Barbara's Buttons Oak Barrens Barbara's Buttons | |
| Marshallia mohrii | Mohr's Barbara's Buttons Coosa Barbara's Buttons | |
| Marshallia obovata | Spoonshaped Barbara's Buttons Piedmont Barbara' Buttons | |
| Marshallia obovata var. obovata | Spoonshaped Barbara's Buttons Piedmont Barbara's Buttons | |
| Marshallia obovata var. scaposa | Spoon-shaped Barbara's Buttons Savanna Barbara's Buttons | |
| Marshallia ramosa | Southern Barbara's Buttons | |
| Marshallia trinervia | Broadleaf Barbara's Buttons Colonial Barbara's Buttons Southern Barbara's Buttons | |
| Marsilea ancylopoda | Tropical Water-clover Tropical Waterclover Bluntspine Water-clover | |
| Marsilea macropoda | Bigfoot Water-clover Water-clover Clover-fern Largefoot Pepperwort | |
| Marsilea mollis | Chihuahuan Water-clover Chihuahuan Waterclover | |
| Marsilea oligospora | Pacific Water-clover Pacific Waterclover Pacific Water Clover | |
| Marsilea vestita | Hairy Water-clover Hairy Waterclover Hairy Water Clover Clover Fern | |
| Marsilea villosa | Villous Water-clover Villous Waterclover Hawaiian Waterfern Hawaiian Pepperwort Ihiihi | |
| Matelea alabamensis | Alabama Milkvine Alabama Spinypod Alabama Spiny Pod | |
| Matelea arizonica | Arizona Milkvine | |
| Matelea atrostellata | Dark-starred Milkvine Darkstar Milkvine | |
| Matelea balbisii | Balbis' Milkvine Balbis Milkvine | |
| Matelea baldwyniana | Baldwin's Milkvine Climbing Milkweed | |
| Matelea biflora | Star Milkvine Purple Milkweed Vine | |
| Matelea brevicoronata | Shortcrown Milkvine Short-crown Milkvine | |
| Matelea carolinensis | Maroon Carolina Milkvine Carolina Anglepod Climbing Milkweed | |
| Matelea cordifolia | Sonoran Milkvine Talayote | |
| Matelea cynanchoides | Prairie Milkvine | |
| Matelea decipiens | Oldfield Milkvine Deceptive Milkvine Deceptive Spinypod | |
| Matelea edwardsensis | Plateau Milkvine Plateau Milkweed Vine | |
| Matelea flavidula | Yellow Carolina Milkvine Yellow-flowered Spiny Pod | |
| Matelea floridana | Florida Milkvine Florida Spiny Pod | |
| Matelea gonocarpos | Anglepod Angularfruit Milkvine | |
| Matelea obliqua | Limerock Milkvine Climbing Milkvine Climbing Milkweed Angle-pod Oblique Milkvine Northern Spinypod | |
| Matelea parviflora | Smallflower Milkvine | |
| Matelea parvifolia | Smallflower Milkvine Spearleaf Littleleaf Matelea Small-leaf Anglepod | |
| Matelea producta | Texas Milkvine | |
| Matelea pubiflora | Sandhill Shinypod Trailing Shinypod Trailing Milkvine | |
| Matelea radiata | Farfurrias Milkvine | |
| Matelea reticulata | Pearl Milkweed Vine Netted Milkvine Green Milkweed Vine Net Vein Milkvine | |
| Matelea sagittifolia | Arrowleaf Milkvine | |
| Matelea texensis | Trans-Pecos Milkvine Texas Milkvine Trans-Pecos Matelea | |
| Matelea woodsonii | Woodson's Milkvine | |
| Matricaria occidentalis | Valley Mayweed | |
| Matteuccia struthiopteris | Ostrich Fern | |
| Maurandella antirrhiniflora | Snapdragon Vine Roving Sailor Climbing Snapdragon Little Snapdragon Vine | |
| Maxillaria crassifolia | False Butterfly Orchid Hidden Orchid | |
| Maxillaria parviflora | Purple Tiger Orchid Small-flowered Maxillaria | |
| Mayaca fluviatilis | Stream Bogmoss | |
| Maytenus phyllanthoides | Florida Mayten Guttapercha Mayten Leather Leaf Mangle Dulce | |
| scientific name | common name(s) | image gallery |
