Common names: T
- table dogwood
- taf
- tall bearded iris
- tall chamomile
- tall moor grass
- tall skullcap
- tall tickseed
- tall tutsan
- tall verbena
- talus slope penstemon
- tamarillo
- tamarisk
- tantoon
- tara
- tarragon
- Tartarian aster
- Tartarian dogwood
- Tartarian honeysuckle
- Tasmanian daisy bush
- Tasmanian flax-lily
- tassel bush
- tassel fern
- tassel flower
- tassel vine
- tasteless stonecrop
- Tatary buckwheat
- tea
- tea crab apple
- tea plant
- tea rose
- tea stick bamboo
- tea tree
- teasel
- teff
- temple juniper
- Tenerife nightshade
- tenweeks stock
- Texas plume
- Texas sleepy daisy
- Texas walnut
- Texas yellowstar
- Thai tulip
- Thatch screw pine
- thicket hawthorn
- thin-leaved cone flower
- thinleaf sunflower
- thistle
- thorn apple
- thorny broom
- thread-leaved sundew
- threadleaf blue star
- three-coloured bindweed
- three-coloured nasturtium
- three-flowered maple
- threeleaf foamflower
- threeleaf purple shamrock
- thrift
- Thunberg's bushclover
- Thunberg's lespedeza
- Thunberg's meadowsweet
- thyme
- thyme-leaf speedwell
- tickseed
- tiger flower
- tiger lily
- tiger lotus
- tiger orchid
- tilt-head aloe
- tinder conk
- tinder fungus
- tinder polypore
- tipa
- titan arum
- toad flower
- toad lily
- toad-flax beard tongue
- toadflax
- toadshade trillium
- tobacco
- Tokyo cherry
- tomatillo
- tomato
- Tonkin cane
- toothache plant
- toothpick weed
- topinambour
- topped lavender
- torch ginger
- torch lily
- Toringo crab apple
- touch-me-not balsam
- tower of jewels
- tower tree
- toyon
- trailing lantana
- traveller's joy
- traveller's tree
- treasure flower
- tree dahlia
- tree fern
- tree hakea
- tree heath
- tree hydrangea
- tree mallow
- tree of heaven
- tree onion
- tree peony
- tree poppy
- tree rhododendron
- tree spinach
- tree spurge
- tree tobacco
- tree tomato
- trembling aspen
- trembling poplar
- triangle palm
- trident maple
- trifoliate orange
- trillium
- triple-veined pearly everlasting
- triplet lily
- triticale
- triumph tulip
- Trojan fir
- Trojan foxglove
- trout lily
- true alkanet
- true indigo
- true oxlip
- true-lover's knot
- trumpet creeper
- trumpet gentian
- trumpet pitcher
- trumpet tree
- trumpet vine
- tuberous morning glory
- tuberous vervain
- tuckeroo
- tufted hair grass
- tufted loosestrife
- tufted saxifrage
- tufted sedge
- tufted vetch
- tulip
- tulip magnolia
- tulip prickly pear
- tulip tree
- tumbleweed
- tumbling ted
- tupelo
- turban buttercup
- turban squash
- Turk's cap lily
- Turkestan allium
- Turkestan pearl bush
- Turkey oak
- Turkey rhubarb
- Turkey tail
- Turkish spearmint
- turnip
- turnip mustard
- turnip rape
- turtlehead
- Tuscan cypress
- tutsan
- twayblade
- twin flowered daphne
- twistedleaf garlic
- two row stonecrop
- two-flowered passion flower
- two-leaf squill
- two-winged silverbell