List of dicotyledons of Montana
There are at least 2109 species of dicotyledons found in Montana according to the Montana Field Guide.  This is a list of Dicotyledoneae orders found in Montana. The Montana Natural Heritage Program has identified a number of dicot species as Species of Concern. Some of these species are exotics (not native to Montana).
The dicotyledons, also known as dicots, are a group of flowering plants whose seed typically has two embryonic leaves or cotyledons. There are around 199,350 species within this group. Flowering plants that are not dicotyledons are monocotyledons, typically having one embryonic leaf.
- List of Asterales of Montana, Order: Asterales
- List of Ranunculales of Montana, Order: Ranunculales
- List of Rubiales of Montana, Order: Rubiales
- List of Campanulales of Montana, Order: Campanulales
- List of Fagales of Montana, Order: Fagales
- List of Lamiales of Montana, Order: Lamiales
- List of Rhamnales of Montana, Order: Rhamnales
- List of Polygonales of Montana, Order: Polygonales
- List of Capparales of Montana, Order: Capparales
- List of Caryophyllales of Montana, Order: Caryophyllales
- Celastrales, Order: Celastrales
- List of Dipsacales of Montana, Order: Dipsacales
- List of Gentianales of Montana, Order: Gentianales
- Dogwood, Order: Cornales
- List of Santalales of Montana, Order: Santalales
- List of Myrtales of Montana, Order: Myrtales
- List of Linales of Montana, Order: Linales
- List of Papaverales of Montana, Order: Papaverales
- List of Geraniales of Montana, Order: Geraniales
- Ginger, Order: Aristolochiales
- Wild-ginger, Asarum caudatum
- List of Apiales of Montana, Order: Apiales
- List of Ericales of Montana, Order: Ericales
- List of Malvales of Montana, Order: Malvales
- List of Sapindales of Montana, Order: Sapindales
- Milkworts, Order: Polygalales
- Oleasters, Order: Proteales
- List of Fabales of Montana, Order: Fabales
- Peony, Order: Dilleniales
- Western Peony, Paeonia brownii
- List of Plantaginales of Montana, Order: Plantaginales
- List of Primulales of Montana, Order: Primulales
- List of Rosales of Montana, Order: Rosales
- List of Scrophulariales of Montana, Order: Scrophulariales
- List of Solanales of Montana, Order: Solanales
- List of Euphorbiales of Montana, Order: Euphorbiales
- List of Theales of Montana, Order: Theales
- Sundews, Order: Nepenthales
- List of Urticales of Montana, Order: Urticales
- List of Violales of Montana, Order: Violales
- Water Milfoil, Order: Haloragales
- List of Nymphaeales of Montana, Order: Nymphaeales
- Water-starworts and Mare's-tails, Order: Callitrichales
- Mare's tails, Family: Hippuridaceae
- Common Mare's-tail, Hippuris vulgaris
- Water-starworts, Family: Callitrichaceae
- Mare's tails, Family: Hippuridaceae
- List of Salicales of Montana, Order: Salicales
- Rydberg, Per Axel PhD (1900). Catalogue of the flora of Montana and the Yellowstone National Park (PDF). New York: New York Botanical Garden.
- Rydberg, Per Axel PhD (1917). Flora of the Rocky Mountains and Adjacent Plains (PDF). New York: New York Botanical Garden.
- Rydberg, Per Axel PhD (1919). Key to the Rocky Mountain flora; Colorado, Utah, Wyoming, Idaho, Montana, Saskatchewan, Alberta, and parts of Nebraska, South Dakota, North Dakota, and British Columbia (PDF). New York: New York Botanical Garden.
- Schiemann, Donald Anthony (2005). Wildflowers of Montana. Missoula, MT: Mountain Press Publishing. ISBN 0-87842-504-7.
- "Montana Field Guide-Dicotyledoneae". Montana Natural Heritage Program. Retrieved 2011-06-16.
- Species of Concern are native taxa that are at-risk due to declining population trends, threats to their habitats, restricted distribution, and/or other factors. Designation as a Montana Species of Concern or Potential Species of Concern is based on the Montana Status Rank, and is not a statutory or regulatory classification. Rather, these designations provide information that helps resource managers make proactive decisions regarding species conservation and data collection priorities. See the latest Species of Concern Reports for more detailed explanations and assessment criteria. "Montana Field Guide-Species of Concern". Retrieved 2010-12-07.
- Exotic species have been deliberately or accidentally introduced to areas outside of their native geographic range and are able to reproduce and maintain sustainable populations in these areas. These exotic populations may also be referred to as alien, introduced, invasive, non-native, or non-indigenous. "Species Status Codes, Exotics". Montana Natural Heritage Project. Retrieved 2011-06-17.
- Hamilton, Alan; Hamilton, Patrick (2006), Plant conservation : an ecosystem approach, London: Earthscan, p. 2, ISBN 978-1-84407-083-1