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Dacrycarpus dacrydioides, commonly known as kahikatea (from Māori) and white pine, is a coniferous tree endemic to New Zealand. A podocarp , it is New Zealand's tallest tree, gaining heights of 60 m over a life span of 600 years.
Viable seeds produced by a mature tree undergo Stratification. [2] This process imitates the period of dormancy that occurs during the winter. [2] In the commercial Christmas Tree nurseries of the northern United States, seeds are sown directly into seed beds in the late fall to allow the seeds to stratify naturally over the winter.
Eastern white pine is self-fertile, but seeds produced this way tend to result in weak, stunted, and malformed seedlings. Mature trees are often 200–250 years old ...
Western white pine is a large tree, regularly growing to 30–50 metres (98–164 ft) tall. It is a member of the white pine group, Pinus subgenus Strobus, and like all members of that group, the leaves ('needles') are in fascicles (bundles) of five, [5] with a deciduous sheath. The needles are finely serrated, [5] and 5
Pinus albicaulis is the only type of tree on the summit of Pywiack Dome in Yosemite National Park. Pinus albicaulis, known by the common names whitebark pine, white bark pine, white pine, pitch pine, scrub pine, and creeping pine, [4] is a conifer tree native to the mountains of the western United States and Canada, specifically subalpine areas of the Sierra Nevada, Cascade Range, Pacific ...
The Tetrazolium Chloride (TZ) test, often called the quick germination test, is a chemical test used to determine seed viability, and results are usually available within 24 to 48 hours The TZ test differs from a germination test in that the TZ test can give you an early and quick snapshot of seed viability but is not a replacement for the more comprehensive seed germination test.
The seeds themselves are only 3-4mm long and have regular grooves stretching the length of the seed. [7] Mountain pine can often be confused with closely related H. biformis, but a key difference between these 2 species' seeds is that mountain pine seeds are typically smaller and squatter than those of H. biformis. [7]
The leaves are scale-like, 2–6 mm long and 0.5 mm broad, arranged in decussate whorls of three on very slender shoots 0.7–1 mm diameter. The cones are globose, 1–2 cm diameter, with six triangular scales, which open at maturity to release the seeds. Perhaps its most remarkable feature is its deeply furrowed bark, with countless vertical ...