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Monardella robisonii

Monotropa hypopithys

Morus rubra

Red mulberry

Murraya paniculata

Mock orange

Najas flexilis

Nardia geoscyphus var. bifida

Nardia geoscyphus var. geoscyphus

Nemacladus capillaris

Nemophila menziesii var. integrifolia

Nephrolepis falcata

Fishtail swordfern

Nierembergia scoparia

Nuphar × interfluitans

Nuphar ovata

Nymphaea lotus

Egyptian lotus

Ochrosia elliptica

Pokosola

Odontonema tubiforme

Oenothera arizonica

Oenothera caespitosa subsp. navajoensis

Oenothera pilosella subsp. pilosella

Monarda punctata ssp. punctata var. arkansana