He described several of the major conifers discovered in the period, including first descriptions of coast redwood (Taxodium sempervirens D. Don; now Sequoia sempervirens (D. Don) Endl.), Bristlecone Fir (Pinus bracteata D. Don, now Abies bracteata (D. Don) A. Poit.), Grand Fir (Pinus grandis Douglas ex D. Don; now Abies grandis (Douglas ex D. Don) Lindl.) and Coulter Pine (Pinus coulteri D. Don), and was the first to treat Sugi (Cupressus japonicaThunb.; now Cryptomeria japonica (Thunb.) D. Don) in a new genus.[citation needed]