Bloomipedia

🌸 State flowers

Colorado in bloom

Colorado's official flower is the white and lavender columbine (1899). Meet it, then explore 110 Colorado wildflowers and garden favorites by bloom month.

Blue columbine
★ Official state flower · 1899

White and lavender columbine

Aquilegia coerulea

Named Colorado's official state flower in 1899 (C.R.S. § 24-80-905). Colorado law (C.R.S. § 24-80-907) makes it illegal to uproot it on public land, to pick more than 25 stems, buds or blossoms there in one day, or to pick it on private land without the owner's permission. In Colorado, most flowering sightings come in June–August.

Meet the blue columbine →

Sources: C.R.S. § 24-80-905; iNaturalist flowering records.

Colorado flower gifts

State flower gifts for anyone who loves Colorado.

🌱 Sample spot. Handmade gift picks from independent shops will appear here once our shop partnership is approved. These cards are placeholders, not real products.

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    White and lavender columbine print

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    Colorado wildflower map

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    Colorado mug

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    Wildflower seed favors

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Explore 110 Colorado flowers

101 wildflowers and flowering shrubs, picked from Colorado's most-observed flowering plants on iNaturalist, plus 9 garden favorites. Filter by bloom month or type.

Showing 109 flowers

Great mullein (Verbascum thapsus)

Great mullein

Verbascum thapsus

Introduced

🌼 Blooms in CO: June–October

10,366 CO sightings on iNaturalist
Showy milkweed (Asclepias speciosa)

Showy milkweed

Asclepias speciosa

Native

🌼 Blooms in CO: June–July

9,858 CO sightings on iNaturalist
Fireweed (Chamaenerion angustifolium)

Fireweed

Chamaenerion angustifolium

Native

🌼 Blooms in CO: July–September

8,225 CO sightings on iNaturalist
Great Plains yucca (Yucca glauca)

Great Plains yucca

Yucca glauca

Native

🌼 Blooms in CO: May–July

7,988 CO sightings on iNaturalist
Lanceleaf stonecrop (Sedum lanceolatum)

Lanceleaf stonecrop

Sedum lanceolatum

Native

🌼 Blooms in CO: June–August

7,224 CO sightings on iNaturalist
Creeping mahonia (Berberis repens)

Creeping mahonia

Berberis repens

Native

🌼 Blooms in CO: March–June

7,190 CO sightings on iNaturalist
Rubber rabbitbrush (Ericameria nauseosa)

Rubber rabbitbrush

Ericameria nauseosa

Native

🌼 Blooms in CO: August–October

6,962 CO sightings on iNaturalist
Field bindweed (Convolvulus arvensis)

Field bindweed

Convolvulus arvensis

Introduced

🌼 Blooms in CO: May–September

6,645 CO sightings on iNaturalist
Plains pricklypear (Opuntia polyacantha)

Plains pricklypear

Opuntia polyacantha

Native

🌼 Blooms in CO: May–July

6,301 CO sightings on iNaturalist
Sulfur buckwheat (Eriogonum umbellatum)

Sulfur buckwheat

Eriogonum umbellatum

Native

🌼 Blooms in CO: June–August

6,111 CO sightings on iNaturalist
Common yarrow (Achillea millefolium)

Common yarrow

Achillea millefolium

Native

🌼 Blooms in CO: June–September

5,987 CO sightings on iNaturalist
Prairie pasqueflower (Pulsatilla nuttalliana)

Prairie pasqueflower

Pulsatilla nuttalliana

★ SD state floral emblemNative

🌼 Blooms in CO: March–June

5,713 CO sightings on iNaturalist
Gunnison's mariposa lily (Calochortus gunnisonii)

Gunnison's mariposa lily

Calochortus gunnisonii

Native

🌼 Blooms in CO: June–August

5,662 CO sightings on iNaturalist
Scarlet globemallow (Sphaeralcea coccinea)

Scarlet globemallow

Sphaeralcea coccinea

Native

🌼 Blooms in CO: April–July

5,574 CO sightings on iNaturalist
Common starlily (Leucocrinum montanum)

Common starlily

Leucocrinum montanum

Native

🌼 Blooms in CO: March–May

5,240 CO sightings on iNaturalist
Whipple's penstemon (Penstemon whippleanus)

Whipple's penstemon

Penstemon whippleanus

Native

🌼 Blooms in CO: June–August

5,234 CO sightings on iNaturalist
Chokecherry (Prunus virginiana)

Chokecherry

Prunus virginiana

Native

🌼 Blooms in CO: April–June

4,986 CO sightings on iNaturalist
Scarlet gilia (Ipomopsis aggregata)

Scarlet gilia

Ipomopsis aggregata

Native

🌼 Blooms in CO: June–August

4,919 CO sightings on iNaturalist
Mountain ball cactus (Pediocactus simpsonii)

Mountain ball cactus

Pediocactus simpsonii

Native

🌼 Blooms in CO: April–June

4,789 CO sightings on iNaturalist
Western harebell (Campanula petiolata)

Western harebell

Campanula petiolata

🌼 Blooms in CO: June–September

4,774 CO sightings on iNaturalist
Monument plant (Frasera speciosa)

Monument plant

Frasera speciosa

Native

🌼 Blooms in CO: June–August

4,773 CO sightings on iNaturalist
Dotted gayfeather (Liatris punctata)

Dotted gayfeather

Liatris punctata

Native

🌼 Blooms in CO: July–September

4,740 CO sightings on iNaturalist
Redstem stork's-bill (Erodium cicutarium)

Redstem stork's-bill

Erodium cicutarium

Introduced

🌼 Blooms in CO: March–June

4,565 CO sightings on iNaturalist
Musk thistle (Carduus nutans)

Musk thistle

Carduus nutans

Introduced

🌼 Blooms in CO: June–October

4,477 CO sightings on iNaturalist
Front range beardtongue (Penstemon virens)

Front range beardtongue

Penstemon virens

Native

🌼 Blooms in CO: May–July

4,462 CO sightings on iNaturalist
Elephant's-Head lousewort (Pedicularis groenlandica)

Elephant's-Head lousewort

Pedicularis groenlandica

Native

🌼 Blooms in CO: June–August

4,021 CO sightings on iNaturalist
Shrubby cinquefoil (Dasiphora fruticosa)

Shrubby cinquefoil

Dasiphora fruticosa

Native

🌼 Blooms in CO: June–September

3,997 CO sightings on iNaturalist
Bearberry (Arctostaphylos uva-ursi)

Bearberry

Arctostaphylos uva-ursi

Native

🌼 Blooms in CO: April–June

3,889 CO sightings on iNaturalist
Lambert's locoweed (Oxytropis lambertii)

Lambert's locoweed

Oxytropis lambertii

Native

🌼 Blooms in CO: May–July

3,838 CO sightings on iNaturalist
Common cowparsnip (Heracleum maximum)

Common cowparsnip

Heracleum maximum

Native

🌼 Blooms in CO: June–August

3,766 CO sightings on iNaturalist
Western spiderwort (Tradescantia occidentalis)

Western spiderwort

Tradescantia occidentalis

Native

🌼 Blooms in CO: May–July

3,670 CO sightings on iNaturalist
Rocky Mountain beeplant (Cleomella serrulata)

Rocky Mountain beeplant

Cleomella serrulata

Native

🌼 Blooms in CO: June–September

3,665 CO sightings on iNaturalist
Western wallflower (Erysimum capitatum)

Western wallflower

Erysimum capitatum

Native

🌼 Blooms in CO: April–August

3,637 CO sightings on iNaturalist
Balkan toadflax (Linaria dalmatica)

Balkan toadflax

Linaria dalmatica

Introduced

🌼 Blooms in CO: May–October

3,576 CO sightings on iNaturalist
Wax currant (Ribes cereum)

Wax currant

Ribes cereum

Native

🌼 Blooms in CO: April–June

3,544 CO sightings on iNaturalist
Yellow sweetclover (Melilotus officinalis)

Yellow sweetclover

Melilotus officinalis

Introduced

🌼 Blooms in CO: May–October

3,536 CO sightings on iNaturalist
Creeping thistle (Cirsium arvense)

Creeping thistle

Cirsium arvense

Introduced

🌼 Blooms in CO: June–October

3,531 CO sightings on iNaturalist
Thistle poppy (Argemone polyanthemos)

Thistle poppy

Argemone polyanthemos

Native

🌼 Blooms in CO: June–September

3,461 CO sightings on iNaturalist
Twinberry honeysuckle (Lonicera involucrata)

Twinberry honeysuckle

Lonicera involucrata

Native

🌼 Blooms in CO: June–August

3,313 CO sightings on iNaturalist
Pinewoods geranium (Geranium caespitosum)

Pinewoods geranium

Geranium caespitosum

Native

🌼 Blooms in CO: May–September

3,292 CO sightings on iNaturalist
American bistort (Bistorta bistortoides)

American bistort

Bistorta bistortoides

Native

🌼 Blooms in CO: June–August

3,273 CO sightings on iNaturalist
Upright prairie coneflower (Ratibida columnifera)

Upright prairie coneflower

Ratibida columnifera

Native

🌼 Blooms in CO: June–September

3,243 CO sightings on iNaturalist
Golden currant (Ribes aureum)

Golden currant

Ribes aureum

Native

🌼 Blooms in CO: March–June

3,152 CO sightings on iNaturalist
Rocky mountain marsh-marigold (Caltha chionophila)

Rocky mountain marsh-marigold

Caltha chionophila

Native

🌼 Blooms in CO: May–August

3,064 CO sightings on iNaturalist
Yellow salsify (Tragopogon dubius)

Yellow salsify

Tragopogon dubius

Introduced

🌼 Blooms in CO: May–July

3,057 CO sightings on iNaturalist
Western blue flag (Iris missouriensis)

Western blue flag

Iris missouriensis

Native

🌼 Blooms in CO: May–July

3,006 CO sightings on iNaturalist
Sidebells penstemon (Penstemon secundiflorus)

Sidebells penstemon

Penstemon secundiflorus

Native

🌼 Blooms in CO: May–June

2,980 CO sightings on iNaturalist
Wholeleaf paintbrush (Castilleja integra)

Wholeleaf paintbrush

Castilleja integra

Native

🌼 Blooms in CO: April–August

2,948 CO sightings on iNaturalist
Western roseroot (Rhodiola integrifolia)

Western roseroot

Rhodiola integrifolia

Native

🌼 Blooms in CO: June–August

2,946 CO sightings on iNaturalist
Richardson's geranium (Geranium richardsonii)

Richardson's geranium

Geranium richardsonii

Native

🌼 Blooms in CO: June–August

2,934 CO sightings on iNaturalist
Great blanketflower (Gaillardia aristata)

Great blanketflower

Gaillardia aristata

Native

🌼 Blooms in CO: June–October

2,862 CO sightings on iNaturalist
Rocky Mountain raspberry (Rubus deliciosus)

Rocky Mountain raspberry

Rubus deliciosus

Native

🌼 Blooms in CO: April–June

2,718 CO sightings on iNaturalist
Ross' avens (Geum rossii)

Ross' avens

Geum rossii

Native

🌼 Blooms in CO: June–September

2,717 CO sightings on iNaturalist
Crossflower (Chorispora tenella)

Crossflower

Chorispora tenella

Introduced

🌼 Blooms in CO: March–June

2,662 CO sightings on iNaturalist
Silky phacelia (Phacelia sericea)

Silky phacelia

Phacelia sericea

Native

🌼 Blooms in CO: June–August

2,554 CO sightings on iNaturalist
Red clover (Trifolium pratense)

Red clover

Trifolium pratense

★ VT state flowerIntroduced

🌼 Blooms in CO: June–October

2,531 CO sightings on iNaturalist
Parry's gentian (Gentiana parryi)

Parry's gentian

Gentiana parryi

Native

🌼 Blooms in CO: July–September

2,481 CO sightings on iNaturalist
Moss campion (Silene acaulis)

Moss campion

Silene acaulis

Native

🌼 Blooms in CO: June–September

2,473 CO sightings on iNaturalist
Common dandelion (Taraxacum officinale)

Common dandelion

Taraxacum officinale

★ NH state wildflowerIntroduced

🌼 Blooms in CO: March–August

2,454 CO sightings on iNaturalist
Corn lily (Veratrum californicum)

Corn lily

Veratrum californicum

Native

🌼 Blooms in CO: June–August

2,442 CO sightings on iNaturalist
American plum (Prunus americana)

American plum

Prunus americana

Native

🌼 Blooms in CO: April–May

2,409 CO sightings on iNaturalist
Queen's crown (Rhodiola rhodantha)

Queen's crown

Rhodiola rhodantha

Native

🌼 Blooms in CO: July–September

2,402 CO sightings on iNaturalist
Virginia strawberry (Fragaria virginiana)

Virginia strawberry

Fragaria virginiana

Native

🌼 Blooms in CO: May–July

2,385 CO sightings on iNaturalist
Alpine sunflower (Hymenoxys grandiflora)

Alpine sunflower

Hymenoxys grandiflora

Native

🌼 Blooms in CO: June–September

2,366 CO sightings on iNaturalist
Butter-and-eggs (common toadflax) (Linaria vulgaris)

Butter-and-eggs (common toadflax)

Linaria vulgaris

Introduced

🌼 Blooms in CO: June–October

2,319 CO sightings on iNaturalist
Fendler's pennycress (Noccaea fendleri)

Fendler's pennycress

Noccaea fendleri

Native

🌼 Blooms in CO: March–July

2,293 CO sightings on iNaturalist
Upland larkspur (Delphinium nuttallianum)

Upland larkspur

Delphinium nuttallianum

Native

🌼 Blooms in CO: April–July

2,288 CO sightings on iNaturalist
Parry's primrose (Primula parryi)

Parry's primrose

Primula parryi

Native

🌼 Blooms in CO: June–August

2,233 CO sightings on iNaturalist
Columbian monkshood (Aconitum columbianum)

Columbian monkshood

Aconitum columbianum

Native

🌼 Blooms in CO: July–August

2,232 CO sightings on iNaturalist
Dark-throated shooting star (Primula pauciflora)

Dark-throated shooting star

Primula pauciflora

Native

🌼 Blooms in CO: May–July

2,181 CO sightings on iNaturalist
Lewis flax (Linum lewisii)

Lewis flax

Linum lewisii

Native

🌼 Blooms in CO: May–August

2,176 CO sightings on iNaturalist
Dwarf mallow (Malva neglecta)

Dwarf mallow

Malva neglecta

Introduced

🌼 Blooms in CO: April–October

2,158 CO sightings on iNaturalist
Nuttall's violet (Viola nuttallii)

Nuttall's violet

Viola nuttallii

Native

🌼 Blooms in CO: March–May

2,157 CO sightings on iNaturalist
Hound's-tongue (Cynoglossum officinale)

Hound's-tongue

Cynoglossum officinale

Introduced

🌼 Blooms in CO: May–July

2,147 CO sightings on iNaturalist
Star-flowered lily-of-the-valley (Maianthemum stellatum)

Star-flowered lily-of-the-valley

Maianthemum stellatum

Native

🌼 Blooms in CO: May–June

2,137 CO sightings on iNaturalist
Woodland pinedrops (Pterospora andromedea)

Woodland pinedrops

Pterospora andromedea

Native

🌼 Blooms in CO: July–August

2,133 CO sightings on iNaturalist
Scarlet beeblossom (Oenothera suffrutescens)

Scarlet beeblossom

Oenothera suffrutescens

Native

🌼 Blooms in CO: May–July

2,085 CO sightings on iNaturalist
Wild bergamot (Monarda fistulosa)

Wild bergamot

Monarda fistulosa

Native

🌼 Blooms in CO: June–August

2,082 CO sightings on iNaturalist
Wild licorice (Glycyrrhiza lepidota)

Wild licorice

Glycyrrhiza lepidota

Native

🌼 Blooms in CO: June–July

2,070 CO sightings on iNaturalist
White point-vetch (Oxytropis sericea)

White point-vetch

Oxytropis sericea

Native

🌼 Blooms in CO: April–July

2,030 CO sightings on iNaturalist
Madrean springbeauty (Claytonia rosea)

Madrean springbeauty

Claytonia rosea

Native

🌼 Blooms in CO: March–May

2,025 CO sightings on iNaturalist
Rhexia-leaved paintbrush (Castilleja rhexiifolia)

Rhexia-leaved paintbrush

Castilleja rhexiifolia

Native

🌼 Blooms in CO: June–September

1,985 CO sightings on iNaturalist
Prairie bluebells (Mertensia lanceolata)

Prairie bluebells

Mertensia lanceolata

Native

🌼 Blooms in CO: April–July

1,941 CO sightings on iNaturalist
Miner's candle (Oreocarya virgata)

Miner's candle

Oreocarya virgata

Native

🌼 Blooms in CO: May–July

1,920 CO sightings on iNaturalist
Tall western groundsel (Senecio integerrimus)

Tall western groundsel

Senecio integerrimus

Native

🌼 Blooms in CO: April–June

1,895 CO sightings on iNaturalist
Nodding onion (Allium cernuum)

Nodding onion

Allium cernuum

Native

🌼 Blooms in CO: July–September

1,889 CO sightings on iNaturalist
Spinystar (Escobaria vivipara)

Spinystar

Escobaria vivipara

Native

🌼 Blooms in CO: May–July

1,836 CO sightings on iNaturalist
Chicory (Cichorium intybus)

Chicory

Cichorium intybus

Introduced

🌼 Blooms in CO: June–October

1,817 CO sightings on iNaturalist
Fragrant evening primrose (Oenothera cespitosa)

Fragrant evening primrose

Oenothera cespitosa

Native

🌼 Blooms in CO: April–July

1,807 CO sightings on iNaturalist
American vetch (Vicia americana)

American vetch

Vicia americana

Native

🌼 Blooms in CO: May–August

1,806 CO sightings on iNaturalist
Early purple milkvetch (Astragalus shortianus)

Early purple milkvetch

Astragalus shortianus

Native

🌼 Blooms in CO: April–June

1,788 CO sightings on iNaturalist
Sickletop lousewort (Pedicularis racemosa)

Sickletop lousewort

Pedicularis racemosa

Native

🌼 Blooms in CO: July–August

1,763 CO sightings on iNaturalist
Hoary alyssum (Berteroa incana)

Hoary alyssum

Berteroa incana

Introduced

🌼 Blooms in CO: June–October

1,754 CO sightings on iNaturalist
Mountain bluebells (Mertensia ciliata)

Mountain bluebells

Mertensia ciliata

Native

🌼 Blooms in CO: June–August

1,739 CO sightings on iNaturalist
Bigbract verbena (Verbena bracteata)

Bigbract verbena

Verbena bracteata

Native

🌼 Blooms in CO: June–September

1,671 CO sightings on iNaturalist
Roses (genus Rosa) (Rosa)

Roses (genus Rosa)

Rosa

★ NY state flower🌷 Garden flower

🌼 Blooms in CO: May–July

1,655 CO sightings on iNaturalist
Prairie pricklypear (Opuntia macrorhiza)

Prairie pricklypear

Opuntia macrorhiza

Native

🌼 Blooms in CO: May–July

1,643 CO sightings on iNaturalist
Pale alpine forget-me-not (Eritrichium argenteum)

Pale alpine forget-me-not

Eritrichium argenteum

Native

🌼 Blooms in CO: June–July

1,635 CO sightings on iNaturalist
Drummond's milkvetch (Astragalus drummondii)

Drummond's milkvetch

Astragalus drummondii

Native

🌼 Blooms in CO: May–June

1,622 CO sightings on iNaturalist
Owlsclaws (Hymenoxys hoopesii)

Owlsclaws

Hymenoxys hoopesii

Native

🌼 Blooms in CO: June–August

1,584 CO sightings on iNaturalist
White globeflower (Trollius albiflorus)

White globeflower

Trollius albiflorus

Native

🌼 Blooms in CO: May–July

1,583 CO sightings on iNaturalist
Common sunflower (Helianthus annuus)

Common sunflower

Helianthus annuus

🌷 Garden flower

🌼 Blooms in CO: June–October

1,386 CO sightings on iNaturalist
Purple lilac (Syringa vulgaris)

Purple lilac

Syringa vulgaris

★ NH state flower🌷 Garden flower

🌼 Blooms in CO: April–June

245 CO sightings on iNaturalist
Orange daylily (Hemerocallis fulva)

Orange daylily

Hemerocallis fulva

🌷 Garden flower

🌷 Grown in Colorado gardens

29 CO sightings on iNaturalist
Daffodil (Narcissus pseudonarcissus)

Daffodil

Narcissus pseudonarcissus

🌷 Garden flower

🌷 Grown in Colorado gardens

9 CO sightings on iNaturalist
Purple coneflower (Echinacea purpurea)

Purple coneflower

Echinacea purpurea

🌷 Garden flower

🌷 Grown in Colorado gardens

8 CO sightings on iNaturalist
Garden tulip (Tulipa gesneriana)

Garden tulip

Tulipa gesneriana

🌷 Garden flower

🌷 Grown in Colorado gardens

3 CO sightings on iNaturalist
Garden peony (Paeonia lactiflora)

Garden peony

Paeonia lactiflora

🌷 Garden flower

🌷 Grown in Colorado gardens

1 CO sightings on iNaturalist
Bigleaf hydrangea (Hydrangea macrophylla)

Bigleaf hydrangea

Hydrangea macrophylla

🌷 Garden flower

🌷 Grown in Colorado gardens

0 CO sightings on iNaturalist

Colorado bloom calendar

Show the full bloom calendar (flowers with 15+ Colorado flowering records, earliest bloomers first)
JJanFFebMMarAAprMMayJJunJJulAAugSSepOOctNNovDDec
Creeping mahonia449 records
Prairie pasqueflower1,314 records
Common starlily762 records
Redstem stork's-bill386 records
Golden currant186 records
Crossflower222 records
Common dandelion135 records
Fendler's pennycress271 records
Nuttall's violet123 records
Madrean springbeauty178 records
Scarlet globemallow320 records
Chokecherry185 records
Mountain ball cactus179 records
Bearberry586 records
Western wallflower405 records
Wax currant105 records
Wholeleaf paintbrush110 records
Rocky Mountain raspberry277 records
American plum1,055 records
Upland larkspur434 records
Dwarf mallow113 records
White point-vetch130 records
Prairie bluebells173 records
Tall western groundsel67 records
Fragrant evening primrose86 records
Early purple milkvetch195 records
Purple lilac172 records
Great Plains yucca94 records
Field bindweed926 records
Plains pricklypear238 records
Front range beardtongue256 records
Lambert's locoweed141 records
Western spiderwort289 records
Balkan toadflax195 records
Yellow sweetclover161 records
Pinewoods geranium196 records
Rocky mountain marsh-marigold525 records
Yellow salsify163 records
Western blue flag117 records
Sidebells penstemon144 records
Virginia strawberry431 records
Dark-throated shooting star114 records
Lewis flax398 records
Hound's-tongue86 records
Star-flowered lily-of-the-valley104 records
Scarlet beeblossom140 records
Miner's candle94 records
Spinystar177 records
American vetch233 records
Roses (genus Rosa)81 records
Prairie pricklypear47 records
Drummond's milkvetch47 records
White globeflower129 records
Great mullein245 records
Blue columbine5,436 records
Showy milkweed692 records
Lanceleaf stonecrop330 records
Sulfur buckwheat1,117 records
Common yarrow493 records
Gunnison's mariposa lily2,765 records
Whipple's penstemon403 records
Scarlet gilia798 records
Western harebell505 records
Monument plant497 records
Musk thistle187 records
Elephant's-Head lousewort509 records
Shrubby cinquefoil390 records
Common cowparsnip94 records
Rocky Mountain beeplant1,701 records
Creeping thistle139 records
Thistle poppy187 records
Twinberry honeysuckle236 records
American bistort475 records
Upright prairie coneflower201 records
Western roseroot221 records
Richardson's geranium585 records
Great blanketflower140 records
Ross' avens394 records
Silky phacelia90 records
Red clover114 records
Moss campion224 records
Corn lily41 records
Alpine sunflower270 records
Butter-and-eggs (common toadflax)128 records
Parry's primrose104 records
Wild bergamot132 records
Wild licorice117 records
Rhexia-leaved paintbrush95 records
Chicory81 records
Hoary alyssum82 records
Mountain bluebells467 records
Bigbract verbena102 records
Pale alpine forget-me-not364 records
Owlsclaws306 records
Common sunflower67 records
Fireweed2,093 records
Dotted gayfeather241 records
Parry's gentian353 records
Queen's crown400 records
Columbian monkshood307 records
Woodland pinedrops26 records
Nodding onion77 records
Sickletop lousewort56 records
Rubber rabbitbrush342 records

Darker = more flowering sightings that month. Based on iNaturalist research-grade observations in Colorado marked “Flowering,” as of October 17, 2026. Garden flowers have few records because research-grade data leaves out planted ones.

How we picked these flowers

We started from iNaturalist's research-grade sightings in Colorado, most-observed first, left out grasses, sedges, trees and other plants with tiny or wind-pollinated flowers (plus poison ivy), kept at most three species per genus, and added Colorado's official flowers and popular garden flowers that iNaturalist users record growing in Colorado. Every flower needs a CC0 or CC BY photo.

Rare plant list: Colorado has no state law listing endangered or threatened plants, so we show NatureServe's Colorado ranks instead.
Invasive plant list: Colorado noxious weed lists A, B and C (8 CCR 1206-2, eff. May 15, 2025)