starting with the flower's color or ◯∩ ⛛✤❀✽ ♆  configuration :  if color-vision deficient CVD, start here

with petals / tepals / sepals / bracts that are colored:
❀ white    
❀ beige    
❀ tan        
❀ brown   

❀ red       
❀ orange 
❀ yellow 
❀ gold     

❀ green   
❀ cyan     
❀ blue      
❀ violet    
❀ pink       
❀ magenta

cluster of small flowers, shape=◯ round

❀ white    
❀ beige    

❀ red       
❀ orange 
❀ green   
❀ cyan     
❀ blue      
❀ violet    
❀ pink       
❀ magenta

single blossom, radial symmetry, with ⚮ 2 equal parts

❀ white    
❀ beige    

❀ pink       
❀ magenta

single blossom,  radial symmetry,  with ✤ 4 equal parts

❀ white    
❀ beige    

❀ yellow 
❀ gold     

❀ green   
❀ cyan     
❀ blue      
❀ violet    
❀ pink       
❀ magenta

single blossom,  radial symmetry,  with ✽💮︎❁ 6+ equal parts

❀ white    
❀ beige    

❀ red       
❀ yellow 
❀ gold     

❀ green   
❀ cyan     
❀ blue      
❀ violet    
❀ pink       
❀ magenta

❀ white       ❀ beige    

and each flowerhead contains a:
cluster of small flowers, shape=◯ round
cluster of small flowers,  shape=∩ elongated

single blossom, radial symmetry, with ⚮ 2 equal parts
single blossom,  radial symmetry,  with ⛛ 3 equal parts
single blossom,  radial symmetry,  with ✤ 4 equal parts
single blossom,  radial symmetry,  with ❀ 5 equal parts
single blossom,  radial symmetry,  with ✽💮︎❁ 6+ equal parts

white beige cluster of small flowers, shape=◯ round

waist-high perennial, clusters of very-small flowers with 5 petals=white around a white center, 20% of a sphere, leaves=very narrow
whorled milkweed  Asclepias verticillata

white beige cluster of small flowers, shape=∩ elongated

shrub;  small white 5 petals with a large green center, that turn into green then dark-purple fruit
American pokeweed  Phytolacca americana

tree;  5 petals;  leaves=short (<10 cm) (<4 in), firm, leathery, broad midrib
◼︎🍒︎ black cherry  Prunus serotina

tree;  5 petals;  leaves=short (<10 cm) (<4 in), teeth curve toward base
🍒︎ chokecherry  Prunus virginiana

white beige single blossom, radial symmetry, with ⚮ 2 equal parts

2-sided white outer- and inner-petals
Asian bleeding-heart  Lamprocapnos spectabilis 'Alba'

white beige single blossom,  radial symmetry,  with ⛛ 3 equal parts

3 striking equally-spaced petals (white, yellow, green, red or pink/magenta) surrounded by 3 sepals (green or reddish) surrounded by 3 equally-spaced ╤ horizontal leaves, halfway between your ankle and knee
trillium  genus Trillium

3 striking equally-spaced white petals surrounded by 3 green or reddish sepals, above 3 equally-spaced ╤ horizontal leaves, halfway between your ankle and knee
◼︎ white trillium  Trillium grandiflorum

white beige single blossom,  radial symmetry,  with ✤ 4 equal parts

tree;  very large blossoms=white, pink or green;  opposite branching
dogwood  genus Cornus

tree, very small blossoms=white;  alternate branching
autumn olive  Elaeagnus umbellata

knee-high herb;  very small blossoms=white
garlic mustard  Alliaria petiolata

white beige single blossom,  radial symmetry,  with ❀ 5 equal parts

ankle-high groundcover, flowers have yellow center, leaves have 3 leaflets and ▲▲ teeth
🍓︎ strawberry  genus Fragaria

knee- to ankle-high groundcover, flowers=white with pink lines
Virginia springbeauty  Claytonia virginica

waist-high perennial, clusters of very-small flowers with 5 petals=white around a white center, 20% of a sphere, leaves=very narrow
whorled milkweed  Asclepias verticillata

waist-high perennial, leaves=🍂︎ non-lobed;  single-flower petals=blue, violet, pink, red or white
phlox  genus Phlox

no thorn-like twigs;  leaves=🍂︎ non-lobed, ▲▲ toothed, each lateral vein terminates in multiple teeth, thin, hairless
🍒︎ pin cherry  Prunus pensylvanica

tree;  clusters of 5 petals;  leaves=short (<10 cm) (<4 in), teeth curve toward base
🍒︎ chokecherry  Prunus virginiana

thorn-like twigs;  leaves=🍂︎ non-lobed, tip=long tapering, undersurface=vein network intricate
American plum  Prunus americana

thorn-like twigs;  leaves=🍂︎ non-lobed, undersurface=​wooly hair
🍎︎ common apple  Malus pumila

thorn-like twigs;  leaves=somewhat-♧-lobed;  twigs, petioles and leaf undersurface=​woolly
🍎︎ prairie crabapple  Malus ioensis

thorn-like twigs;  leaves=somewhat--lobed;  twigs and leaves=not woolly
🍎︎ wild crabapple  Malus coronaria

white beige single blossom,  radial symmetry,  with ✽💮︎❁ 6+ equal parts

6 white petals;  above leaves=ankle-high, two-color (gray and dark-green)
white trout lily  Erythronium albidum

6 white petals, hidden under two large ╤ horizontal lobed leaves, knee- to boot-top-high;  plants grouped together in a forest, only visible early in growing season
mayapple  Podophyllum peltatum

8-10-12 white petals, yellow center;  ankle-high;  when plant pulled up, roots drip red sap
bloodroot  Sanguinaria canadensis

many petals, yellow center
common daisy  Bellis perennis

❀ red       

and each flowerhead contains a:
cluster of small flowers, shape=◯ round
cluster of small flowers,  shape=∩ elongated

single blossom, radial symmetry, with ⛛ 3 equal parts
single blossom,  radial symmetry,  with ❀ 5 equal parts
single blossom,  radial symmetry,  with ✽💮︎❁ 6+ equal parts

single blossom,  ♆ bilateral (mirror) ( face-like) symmetry

red cluster of small flowers, shape=◯ round

tree;  very-showy, small blossoms, appear early in growing season—often before leaves
◼︎ red maple  Acer rubrum

herbaceous (waist-high);  very-showy, large combined blossoms, stem shape=◼︎ square
◼︎ 🐝︎ scarlet beebalm  Monarda didyma

red cluster of small flowers,  shape=∩ elongated

size of very-large ice cream cone, inverted above branch, yellow-green (flower) or deep-red (fruit);  small tree
staghorn sumac  Rhus typhina

elongated clusters of red flowers with bilateral symmetry;  herbaceous plant
cardinal flower  Lobelia cardinalis

red single blossom, radial symmetry, with ⛛ 3 equal parts

3 striking equally-spaced petals (white, yellow, green, red or pink/magenta) surrounded by 3 sepals (green or reddish) surrounded by 3 equally-spaced ╤ horizontal leaves, halfway between your ankle and knee
trillium  genus Trillium

deep-red, right at ground level (dig through leaf-litter to see it)
wild ginger  genus Asarum

red single blossom,  radial symmetry,  with ❀ 5 equal parts

deep-red, along a vine
◼︎ pale swallow-wort  Cynanchum rossicum

red single blossom,  radial symmetry,  with ✽💮︎❁ 6+ equal parts

very-showy, large combined blossoms, herbaceous, stem shape=◼︎ square
◼︎ 🐝︎ scarlet beebalm  Monarda didyma

red single blossom, ♆ bilateral (mirror) ( face-like) symmetry

elongated clusters of red flowers with bilateral symmetry;  herbaceous plant
cardinal flower  Lobelia cardinalis

❀ yellow    ❀ gold     

reminds Kelly D. Norris of 🌐︎ northern-hemisphere August (🌐︎ southern-hemisphere February).
Continue with whether each flowerhead contains a:
cluster of small flowers, shape=∩ elongated

single blossom, radial symmetry, with ⛛ 3 equal parts
single blossom,  radial symmetry,  with ✤ 4 equal parts
single blossom,  radial symmetry,  with ✽💮︎❁ 6+ equal parts

yellow gold cluster of small flowers, shape=∩ elongated

size of very-large ice cream cone, inverted above branch, yellow-green (flower) or deep-red (fruit)
staghorn sumac  Rhus typhina

large, above branch, yellow-to-orange;  crushed leaflets (mash well) smell like peanut butter or rotting cashews
tree of heaven  Ailanthus altissima

yellow gold single blossom,  radial symmetry,  with ⛛ 3 equal parts

3 striking equally-spaced petals (white, yellow, green, red or pink/magenta) surrounded by 3 sepals (green or reddish) surrounded by 3 equally-spaced ╤ horizontal leaves, halfway between your ankle and knee
trillium  genus Trillium

3 striking equally-spaced yellow petals surrounded by 3 green sepals, above 3 equally-spaced ╤ horizontal variegated leaves (two colors—green and gray-green), halfway between your ankle and knee
◼︎ yellow trillium  Trillium luteum

yellow gold single blossom,  radial symmetry,  with ✤ 4 equal parts

woody shrub, waist- to head-high;  flowers=very-showy, appear early in growing season—often before leaves
forsythia  genus Forsythia

herbaceous, boot-top-high;  petals do not overlap
greater celandine poppy  Chelidonium majus

herbaceous, boot-top-high;  petals overlap
celandine poppy  Stylophorum diphyllum

yellow gold single blossom,  radial symmetry,  with ✽💮︎❁ 6+ equal parts

6 petals;  leaves=ankle-high, two-color (gray and dark-green)
yellow trout lily  Erythronium americanum

8 petals, aquatic
lesser celandine / fig buttercup  Ficaria verna

~8 very-thin petals, stays on long into dormant season, yellow to yellow-green (inner) and school-bus-yellow (outer)
American witch-hazel  Hamamelis virginiana

many yellow petals, yellow center, ankle-high
dandelion  genus Taraxacum

many yellow petals, roughly head-high
sunflower  genus Helianthus

❀ cyan        ❀ blue         ❀ violet    

and each flowerhead contains a:
cluster of small flowers, shape=◯ round
cluster of small flowers,  shape=∩ elongated

single blossom, radial symmetry, with ✤ 4 equal parts
single blossom,  radial symmetry,  with ❀ 5 equal parts
single blossom,  radial symmetry,  with ✽💮︎❁ 6+ equal parts

single blossom,  ♆ bilateral (mirror) ( face-like) symmetry

cyan blue violet cluster of small flowers, shape=◯ round

light purple or pink around white center, 40% of sphere, subtle smell of vanilla
♒︎ swamp milkweed  Asclepias incarnata

violet, very showy, large combined blossoms, herbaceous, stem shape=◼︎ square
🐝︎ bee balm  genus Monarda

violet
crown vetch  Securigera varia

cyan blue violet cluster of small flowers, shape=∩ elongated

violet, each flower has bilateral (mirror) ( face-like) symmetry;  vine;  leaves=🌿︎ compound 3 leaflets
kudzu  Pueraria montana

violet, each flower has bilateral (mirror) ( face-like) symmetry;  herb;  leaves=❋ whorled five-to-28 leaflets
lupine  genus Lupinus

violet
crown vetch  Securigera varia

violet
mint  family Lamiaceae

cyan blue violet single blossom, radial symmetry, with ✤ 4 equal parts

usually lavender or purple, sometimes white or pink, or mixed in cultivars
dame's rocket  Hesperis matronalis

cyan blue violet single blossom,  radial symmetry,  with ❀ 5 equal parts

leaves=🍂︎ non-lobed;  petals=blue, violet, pink, red or white
phlox  genus Phlox

leaves=🍂︎ non-lobed;  petals=purple (very-dark) or black
◼︎ black swallow-wort  Cynanchum louiseae

non-woody herb;  low (ankle-high);  leaves=5--lobed;  petals=violet, pink, rarely white
wild geranium  Geranium maculatum

cyan blue violet single blossom,  radial symmetry,  with ✽💮︎❁ 6+ equal parts

violet, very showy, large combined blossoms, herbaceous, stem shape=◼︎ square
🐝︎ bee balm  genus Monarda

cyan blue violet single blossom, ♆ bilateral (mirror) ( face-like) symmetry

violet, leaves=❋ whorled five-to-28 leaflets
lupine  genus Lupinus

Learn more about ⚘ ❀ flowers

Uses by native peoples
(Ethnobotany database)

plant terminology Wikipedia