| Cupressaceae | |
Thuja acuta
| Moench | Methodus 692 | 1794 |
| Cupressaceae | |
Thuja andina
| Poepp. & Endl. | Nov. Gen. Sp. Pl. 3: 17, t. 220 | 1841 |
| Cupressaceae | |
Thuja aphylla
| L. | Cent. Pl. I 32–33 | 1755 |
| Cupressaceae | |
Thuja articulata
| Vahl | Symb. Bot. 2: 96 | 1791 |
| Cupressaceae | |
Thuja australis
| Bosc ex Poir. | Encycl., Suppl. 5: 302 | 1817 |
| Cupressaceae | |
Thuja beverleyensis
| Hort. ex Rehder | Stand. Cycl. Hort. 6: 3337 | 1917 |
| Cupressaceae | |
Thuja chengii
| Bordères & Gaussen | Trav. Lab. Forest. Toulouse I. 3(6): 6 | 1939 |
| Cupressaceae | |
Thuja chilensis
| D. Don | Descr. Pinus (ed. 3) 1: 128 | 1832 |
| Cupressaceae | |
Thuja craigana
| Grev. & Balf. in A. Murr. | Bot. Exped. Oregon no. 750, pl. 3 | 1853 |
| Cupressaceae | |
Thuja cristata
| Carrière | Traité Gén. Conif. (ed. 2) 97 | |
| Cupressaceae | |
Thuja cupressoides
| L. | Mant. Pl. 1: 125 | 1767 |
| Cupressaceae | |
Thuja decora
| Salisb. | Prodr. Stirp. Chap. Allerton 398 | 1796 |
| Cupressaceae | |
Thuja decurrens
| (Torr.) Voss | Mitt. Deutsch. Dendrol. Ges. 16: 88 | 1907 [1908] |
| Cupressaceae | |
Thuja dolabrata
| Thunb. ex L. f. | Suppl. Pl. 420 | 1781 [1782] |
| Cupressaceae | * |
Thuja doniana
| Hook. | London J. Bot. 1: 571 | 1842 |
| Cupressaceae | |
Thuja ericoides
| Carrière | Traité Gén. Conif. (ed. 2) 141 | |
| Cupressaceae | |
Thuja excelsa
| Bong. | Mém. Acad. Imp. Sci. St.-Pétersbourg, Sér. 6, Sci. Math. 2(2): 164 | 1832 |
| Cupressaceae | |
Thuja gigantea
| Nutt. | J. Acad. Nat. Sci. Philadelphia 7(1): 52–53 | 1834 |
| Cupressaceae | |
Thuja japonica
| Maxim. | Bull. Acad. Imp. Sci. Saint-Petersbourg, sér. 3 10: 490 | 1866 |
| Cupressaceae | |
Thuja koraiensis
| Nakai | Bot. Mag. (Tokyo) 33(395): 196 | 1919 |
| Cupressaceae | |
Thuja lineata
| Poir. | Encycl., Suppl. 5: 303 | 1817 |
| Cupressaceae | |
Thuja lycopodioides
| Beissn. | Handb. Nadelholzk. 44 | 1891 |
| Cupressaceae | |
Thuja macrolepis
| (Kurz) Voss | Mitt. Deutsch. Dendrol. Ges. 16: 88 | 1907 |
| Cupressaceae | |
Thuja meldensis
| Quetier | Horticulteur Franç. 5: 231 | 1855 |
| Cupressaceae | |
Thuja menziesii
| Douglas ex Endl. | Syn. Conif. 52 | 1847 |
| Cupressaceae | |
Thuja obtusa
| Moench | Methodus 691 | 1794 |
| Cupressaceae | |
Thuja obtusa
| Mast. | J. Proc. Linn. Soc., Bot., Suppl. 18: 491, f. 4 | 1881 |
| Cupressaceae | |
Thuja occidentalis
| L. | Sp. Pl. 2: 1002 | 1753 |
| Cupressaceae | |
Thuja odorata
| Marshall | Arbust. Amer. 152 | 1785 |
| Cupressaceae | |
Thuja orientalis
| L. | Sp. Pl. 2: 1002 | 1753 |
| Cupressaceae | |
Thuja papuana
| (F. Muell.) Voss | Mitt. Deutsch. Dendrol. Ges. 1907(16): 88 | 1907 |
| Cupressaceae | |
Thuja pendula
| Lamb. | | |
| Cupressaceae | |
Thuja pensilis
| Staunton ex D. Don | Descr. Pinus (ed. 2) 2: 115 | 1828 |
| Cupressaceae | |
Thuja pisifera
| Mast. | J. Linn. Soc., Bot. 27: 489 | 1891 |
| Cupressaceae | |
Thuja plicata
| Donn ex D. Don | Descr. Pinus 2: (19) | 1824 |
| Cupressaceae | |
Thuja procera
| Salisb. | Prodr. Stirp. Chap. Allerton 398 | 1796 |
| Cupressaceae | |
Thuja pyramidalis
| Ten. | | |
| Cupressaceae | |
Thuja quadrangularis
| Vent. ex Duhamel | Traité Arbr. Arbust. 3: 16 | 1806 |
| Cupressaceae | |
Thuja sphaeroidalis
| Rich. & A. Rich. | Comm. Bot. Conif. Cycad. 45, pl. 8, f. 2 | 1826 |
| Cupressaceae | |
Thuja sphaeroidea
| Spreng. | Syst. Veg. [Sprengel] 3: 889 | 1826 |
| Cupressaceae | |
Thuja standishii
| (Gordon) Carrière | Traité Gén. Conif. 1: 108 | 1867 |
| Cupressaceae | |
Thuja sutchuenensis
| Franch. | J. Bot. (Morot) 13(9): 262–263 | 1899 |
| Cupressaceae | |
Thuja tetragona
| Hook. | London J. Bot. 3: 148, t. 4 | 1844 |
| Cupressaceae | |
Thuja theophrasti
| C. Bauhin ex Nieuwl. | Amer. Midl. Naturalist 2(10): 284 | 1912 |
| Cupressaceae | |
Thuja wareana
| Carrière | Traité Gén. Conif. 104 | |