Complete list of species
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| scientific name | common name(s) | image gallery |
| Trillium maculatum | Spotted Wakerobin Spotted Trillium | |
| Trillium nivale | Snow Trillium Snow Wake-robin | |
| Trillium ovatum | Pacific Trillium Pacific Wake-robin Western Trillium Western Wake-robin Coast Trillium Coast Wake-robin | |
| Trillium ovatum ssp. oettingeri | Oettinger's Trillium Salmon Mtns. Wakerobin Western Wake Robin | |
| Trillium ovatum ssp. ovatum | Pacific Trillium Western Wake Robin Western Wakerobin | |
| Trillium ovatum var. hibbersonii | Hibberson's Trillium Dwarf Trillium | |
| Trillium ovatum var. ovatum | Pacific Trillium | |
| Trillium persistens | Persistent Wakerobin Persistent Trillium | |
| Trillium petiolatum | Idaho Trillium Idaho Wake-robin Roundleaf Trillium Roundleaf Wake-robin | |
| Trillium pusillum | Dwarf Wakerobin Dwarf Trillium | |
| Trillium pusillum var. ozarkanum | Ozark Wakerobin Ozark Trillium | |
| Trillium pusillum var. pusillum | Dwarf Wakerobin Dwarf Trillium | |
| Trillium pusillum var. virginianum | Dwarf Trillium Least Trillium Virginia Wakerobin | |
| Trillium recurvatum | Prairie Trillium Prairie Wake-robin Bloody Butcher | |
| Trillium reliquum | Confederate Wakerobin Confederate Trillium | |
| Trillium rivale | Brook Wake-robin Brook Trillium Klamath Wake-robin Klamath Trillium | |
| Trillium rugelii | Ill-scented Wakerobin Ill-scented Trillium Southern Nodding Trillium | |
| Trillium sessile | Toadshade Red Trillium Red Wake-robin Sessile Trillium Sessile Wake-robin Yellow Trillium Yellow Wake-robin | |
| Trillium simile | Jeweled Wakerobin Jeweled Trillium | |
| Trillium stamineum | Blue Ridge Wakerobin Blue Ridge Trillium | |
| Trillium sulcatum | Furrowed Wakerobin Furrowed Trillium | |
| Trillium texanum | Texas Trillium Texas Wakerobin | |
| Trillium underwoodii | Longbract Wakerobin Longbract Trillium | |
| Trillium undulatum | Painted Trillium Painted Wakerobin | |
| Trillium vaseyi | Sweet Trillium Sweet Wakerobin Vasey's Trillium Vasey's Wakerobin | |
| Trillium viride | Wood Trillium Wood Wakerobin Green Trillium Green Wakerobin | |
| Trillium viridescens | Tapertip Wakerobin Tapertip Trillium | |
| Triodanis biflora | Small Venus' Looking-glass | |
| Triodanis coloradoensis | Colorado Venus' Looking-glass Western Venus' Looking Glass | |
| Triodanis holzingeri | Holzinger's Venus' Looking-glass | |
| Triodanis lamprosperma | Prairie Venus' Looking-glass Prairie Venus' Lookingglass | |
| Triodanis leptocarpa | Slimpod Venus' Looking-glass | |
| Triodanis perfoliata | Clasping Venus's Looking-glass | |
| Triodanis texana | Texas Venus' Looking-glass | |
| Triosteum angustifolium | Yellow-fruit Horse-gentian Narrow-leaved Horse-gentian Narrowleaf Horse-gentian | |
| Triosteum aurantiacum | Orange-fruit Horse-gentian | |
| Triosteum aurantiacum var. aurantiacum | Orangefruit Horse-gentian | |
| Triosteum aurantiacum var. glaucescens | Early Horse Gentian Orange-fruit Horse-gentian Orangefruit Horse-gentian Red-fruited Horse Gentian Wild Coffee | |
| Triosteum aurantiacum var. illinoense | Illinois Horse-gentian Red-fruited Horse Gentian Wild Coffee | |
| Triosteum perfoliatum | Feverwort Wild Coffee | |
| Triphora amazonica | Broad Leaved Noddingcaps Broadleaf Noddingcaps Wide-leaved Triphora | |
| Triphora craigheadii | Craighead's Noddingcaps Craigheads's Orchid | |
| Triphora gentianoides | Gentian Noddingcaps Least Flowered Triphora | |
| Triphora rickettii | Rickett's Noddingcaps Yucatan Noddingcaps | |
| Triphora trianthophoros | Threebirds Three-birds Orchid | |
| Triphysaria eriantha | Johnny-tuck Johnny Tuck Johnnytuck Butter-and-eggs | |
| Triphysaria eriantha ssp. eriantha | Johnny-tuck | |
| Triphysaria eriantha ssp. rosea | Johnny Tuck Johnny-tuck Johnnytuck Pink Butter 'n' Eggs | |
| Triphysaria floribunda | San Francisco Owl's-clover | |
| Triphysaria micrantha | Little Butter 'n' Eggs Purple-beak False Owl-clover Purple-beak Owl’s-clover Purplebeak Owl's Clover Purplebeak Owl's-clover | |
| Triphysaria pusilla | Dwarf False Owl-clover Dwarf Johnny-tuck Dwarf Owl's-clover Dwarf Owl’s-clover Little Owl's Clover | |
| Triphysaria versicolor | Smooth Owl's-clover Yellow Owl's Clover Yellowbeak Owl's Clover Yellowbeak Owl's-clover | |
| Triphysaria versicolor ssp. faucibarbatus | Yellowbeak Owl's-clover Yellowbeak Owl's Clover Yellow Owl's Clover | |
| Triphysaria versicolor ssp. versicolor | Yellowbeak Owl's-clover | |
| Triplasis americana | Perennial Sandgrass | |
| Triplasis purpurea | Purple Sandgrass Purple Triplasis | |
| Tripleurospermum maritimum | False Mayweed | |
| Tripleurospermum maritimum ssp. phaeocephalum | False Mayweed | |
| Tripogon spicatus | American Fiveminute Grass | |
| Tripsacum dactyloides | Eastern Gamagrass Fakahatchee Grass | |
| Tripsacum floridanum | Florida Gamagrass Florida Mock Grama | |
| Tripsacum lanceolatum | Mexican Gamagrass Mexican Mock Grama | |
| Tripterocalyx carneus | Winged Sandpuffs | |
| Tripterocalyx carneus var. carneus | Winged Sandpuffs | |
| Tripterocalyx carneus var. wootonii | Wooton's Sandpuffs | |
| Tripterocalyx crux-maltae | Cross Sandpuffs Lassen Sand Verbena Lassen Sandverbena | |
| Tripterocalyx micranthus | Smallflower Sandverbena | |
| Trisetum canescens | Nodding Oatgrass Nodding Trisetum Tall False Oat Tall Trisetum | |
| Trisetum glomeratum | Pili Uka Mountain Pili | |
| Trisetum inaequale | Whitney's False Oat | |
| Trisetum interruptum | Prairie False Oat | |
| Trisetum melicoides | Purple False Oat | |
| Trisetum orthochaetum | Bitterroot False Oat Bitterroot Trisetum Hybrid False Oat | |
| Trisetum sibiricum | Siberian False Oat Siberian Oatgrass Siberian Trisetum | |
| Trisetum sibiricum ssp. litorale | Siberian False Oat Siberian Oatgrass | |
| Trisetum sibiricum ssp. sibiricum | Siberian False Oat Siberian Oatgrass | |
| Trisetum spicatum | Spike Trisetum Narrow False Oat | |
| Trisetum wolfii | Beardless Oatgrass Wolf's Trisetum | |
| Triteleia bridgesii | Bridges' Brodiaea | |
| Triteleia clementina | San Clemente Island Triteleia | |
| Triteleia crocea | Yellow Brodiaea Yellow Triplet Lily Yellow Triteleia | |
| Triteleia crocea var. crocea | Yellow Triplet Lily Yellow Triteleia | |
| Triteleia crocea var. modesta | Trinity Mountains Pretty Face Yellow Triteleia | |
| Triteleia dudleyi | Dudley's Triplet Lily Dudley's Triteleia | |
| Triteleia grandiflora | Wild Hyacinth Largeflower Triteleia Blue Umber Lily Blue Lily | |
| Triteleia grandiflora var. grandiflora | Largeflower Triteleia Large-flower Tritelia | |
| Triteleia grandiflora var. howellii | Howell's Triteleia | |
| Triteleia hendersonii | Henderson's Triteleia Yellow Tiger-lily | |
| Triteleia hendersonii var. hendersonii | Henderson's Triteleia | |
| Triteleia hendersonii var. leachiae | Leach's Triteleia | |
| Triteleia hyacinthina | White Brodiaea | |
| Triteleia ixioides | Prettyface | |
| Triteleia ixioides ssp. anilina | Prettyface | |
| Triteleia ixioides ssp. cookii | Cook's Triteleia | |
| Triteleia ixioides ssp. ixioides | Golden Brodiaea | |
| Triteleia ixioides ssp. scabra | Foothill Triteleia Prettyface | |
| Triteleia ixioides ssp. unifolia | Prettyface | |
| Triteleia laxa | Ithuriel's Spear Wally Basket Grass Nut | |
| Triteleia lemmoniae | Lemmon’s Triteleia Oak Creek Triteleia | |
| Triteleia lilacinum | Foothill Triteleia Lilac Pretty Face | |
| scientific name | common name(s) | image gallery |
