Malva neglecta. 69
Marsh-fleabane. 187
Maximilian sunflower. 152
Medicago lupulina. 259
Melampodium leucanthum. 131
Melilotus alba. 202
Melilotus officinalis. 200
Mentzelia decapetala. 123
Mentzelia nuda. 122
Mentzelia oligosperma. 52
Microseris cuspidata. 174
Mimulus glabratus var. fremontii. 238
Mirabilis linearis. 75
Mirabilis nyctaginea. 71
Missouri milkvetch . 215
Monarda citriodora. 233
Monarda punctata. 232
Mountain corkwing . 256
Narrow-leaved puccoon. 68
Narrowleaf bluet . 5
Narrowleaf four-o'clock . 75
Nasturtium officinale. 33
Needleleaf gilia. 56
Nettle leaf noseburn. 267
New Jersey Tea. 42
Northern frog fruit. 245
Norton's flax. 57
Nuttall evolvulus. 95
Oenothera albicaulis. 23
Oenothera biennis. 22
Oenothera elata, ssp. hirsutissima. 25
Oenothera laciniata. 15
Oenothera latifolia . 24
Oenothera macrocarpa . 14
Opuntia imbricata. 120
Opuntia macrorhiza. 119
Oval-leaf bladderpod. 26
Oxalis stricta. 64
Oxytropis lambertii. 216
Oxytropis sericea. 221