Although followed by many researchers, this 1966 version of the Mac Key classification [reference] does not reflect Mac Key's current concept of Triticum [Mac Key 1988]. The classification is presented here for its historical value with corrections in authority citations.
| Section Monococca Flaksb. (2n = 14) / Einkorn |
| Triticum monococcum L. |
| subsp. boeoticum (Boiss.) Á. Löve & D. Löve |
| subsp. monococcum |
| Section Dicoccoides Flaksb. (2n = 28) / Emmer |
| Triticum timopheevii (Zhuk.) Zhuk. |
| subsp. araraticum (Jakubz.) MacKey |
| subsp. timopheevii |
| Triticum turgidum L. |
| subsp. dicoccoides (Körn. ex Asch. & Graebner) Thell. |
| subsp. dicoccum (Schrank ex Schübler) Thell. |
| subsp. paleocolchicum (Menabde) Á. Löve & D. Löve |
| subsp. turgidum |
| conv. turgidum |
| conv. durum (Desf.) MacKey |
| conv. polonicum (L.) MacKey |
| conv. turancium (Jakubz.) MacKey |
| subsp. carthlicum (Nevski in Kom.) Á. Löve & D. Löve |
| Triticum zhukovskyi Menabde & Ericzjan |
| Section Speltoidea (2n = 42) / Dinkel |
| Triticum aestivum L. |
| subsp. aestivum [originally treated by Mac Key as subsp. vulgare] |
| subsp. compactum (Host) MacKey |
| subsp. macha (Dekapr. & Menabde) MacKey |
| subsp. spelta (L.) Thell. |
| subsp. sphaerococcum (Percival) MacKey |
| subsp. vavilovi (Tumanian) Sears |