Kalmar “genus” tana nufin nau’in harajin da ake amfani da shi wajen rarrabuwar halittu da ke tattare nau’ukan da ke da alaƙa ta kud-da-kud ta fuskar halayensu da tarihin juyin halitta. a cikin dangin Pinaceae, wanda aka fi sani da Douglas firs. Sunan "Pseudotsuga" yana nufin "ƙarar ƙanƙara," kamar yadda aka fara tunanin waɗannan bishiyoyi suna da alaƙa da bishiyar hemlock (Tsuga genus), amma a zahiri suna da alaƙa da spruce da bishiyar fir.Saboda haka. , "Genus Pseudotsuga" yana nufin rarrabuwa taxonomic na rukuni na bishiyoyin coniferous wanda aka fi sani da Douglas firs.