Thesium chinense Turcz. (Synonym : Thesium rugulosum Bunge ex A.DC.)

Family : Santalaceae

Thesium refractum C.A.Mey. (Synonym : Linosyris refracta Kuntze)

Family : Santalaceae

Thladiantha dubia Bunge

Family : Cucurbitaceae

Thlaspi arvense L. (Synonym : Thlaspi baicalense DC.)

Family : Brassicaceae [Naturalized plant]

Thrixspermum japonicum (Miq.) Rchb.f. (Synonym : Sarcochilus japonicus Miq.)

Family : Orchidaceae

Thuja koraiensis Nakai (Synonym : Thuja kongoensis Doi ex Nakai)

Family : Cupressaceae

Thuja occidentalis L. (Synonym : Thuja sibirica Gordon)

Family : Cupressaceae

Thujopsis dolabrata (L.f.) Siebold & Zucc. (Synonym : Thujopsis dolabrata (L.f.) Siebold & Zucc. var. australis A.Henry)

Family : Cupressaceae

Thymus quinquecostatus Čelak. (Synonym : Thymus quinquecostatus Čelak. var. japonicus H.Hara)

Family : Lamiaceae

Thymus quinquecostatus Čelak. var. magnus (Nakai) Kitam. (Synonym : Thymus przewalskii (Kom.) Nakai var. magnus Nakai)

Family : Lamiaceae