Abies borisii-regis, first described in 1925 by Johannes Mattfeld (1895-1951), is commonly called the King Boris fir, Bulgarian fir or Macedonian fir, also as Българска ела in the Bulgarian language and makedón jegenyefenyő in Hungarian. The scientific name honors Tsar Boris III of Bulgaria, during whose reign it was described as a new species in 1925. The name is sometimes cited without a hyphen (Abies borisiiregis), though under the provisions of ICBN the hyphen is to be retained.
Description. Bulgarian fir is a tall evergreen coniferous tree that grows to a mature height of 100 feet (30 m) tall with somewhat variable characteristics. It does not branch at the basal portion. Young branches are light-yellow, dense and soft yellow or black pubescent, but quickly becoming glabrous. Buds are lightly resinous; needles densely arranged, not parted above, oriented upward and to the side, to 1.25 inches (30 mm) long, acute to nearly prickly, occasionally somewhat emarginate, furrowed above and usually without stomata, 2 white stomatal bands beneath, each with 6-10 lines. Seed cones are cylindrical to conical, to 6 inches (15 cm) long, seed scales short, tomentose, with exserted and reflexed bract scales.
Distribution. This species is native to Bulgaria, northern Greece, Albania, and former Yugoslavia, growing at elevations of 2,000 to 5,000 feet (700 – 1700 m) in the Pirin Mountains of Southwestern Bulgaria and to 5,500 feet (1,800 m) of elevation in Greece.Attributed from: Chris Earle, The Gymnosperm Database, ©2012