Japanese Douglas fir
| Japanese Douglas fir | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Pseudotsuga japonica | ||||||||||||
| ( Shiras. ) Beissn. |
The Japanese Douglas fir ( Pseudotsuga japonica ) is a plant from the genus of Douglas fir ( Pseudotsuga ) in the family of Pinaceae (Pinaceae).
description
The Japanese Douglas fir is an evergreen tree that reaches heights of about 12 to 30 meters and a trunk diameter ( breast height diameter BHD) of 1.5 meters. The trunk is usually knotless to about two thirds of its height. The bark is dark brown and turns greyish on very old trees. The hairless bark of the branches is initially light yellowish-brown and in the second year it becomes greyish. The scales of the buds are shiny brown. The needle-shaped leaves are glossy green, often curved, blunt and edged, 15 to 25 mm long and 1.5 mm wide.
The Japanese Douglas fir is single-sexed ( monoecious ). It blooms in April. The male cones are axillary on branches from the previous year; they are cylindrical, brownish yellow and contain many stamens . With a length of 4 to 5 cm and a diameter of 2 to 2.5 cm , the female cones , located at the end of short shoots , are the smallest in the genus. They are initially brown with bluish spots, later they become chocolate-brown and have 15 to 20 thick, woody seed scales. The three-lobed cover scales are about 20 mm long and 4 to 5 mm wide are above the seed scales. The winged seeds ripen in October and are glossy dark brown, 6 to 9 mm long and 5 mm wide. The wide wing is dark brown, 10 to 13 mm long and 6 mm wide.
The number of chromosomes is 2n = 24.
distribution
The home of the Japanese Douglas fir is located in southeastern Japan on the islands of Honshū and Shikoku . It grows there at altitudes between 500 and 1100 meters. It is very rarely planted in Central Europe .
photos
branch
Cones
Needles
swell
- Christopher J. Earle: Pseudotsuga japonica. In: The Gymnosperm Database. December 21, 2010, accessed November 4, 2011 .
Individual evidence
Web links
- Pseudotsuga japonica inthe IUCN Red List of Threatened Species 2013.2. Posted by: Katsuki, T., Luscombe, D & Farjon, A., 2012. Retrieved December 30, 2013.