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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.
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 ...
It is a measure of germination time course and is usually expressed as a percentage, e.g., an 85% germination rate indicates that about 85 out of 100 seeds will probably germinate under proper conditions over the germination period given. Seed germination rate is determined by the seed genetic composition, morphological features and ...
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 ...
Kittredge and Gervorkiantz (1929) [133] determined that removal of the aspen forest floor increased germination percentage after the second season in seed spots of both white pine and white spruce, in four plots, from 2.5% to 5%, from 8% to 22%, from 1% to 9.5%, and from 0% to 15%.
The effects of carbon dioxide enrichment and nitrogen supply on the growth of white spruce and trembling aspen were investigated by Brown and Higginbotham (1986). [5] Seedlings were grown in controlled environments with ambient or enriched atmospheric CO 2 (350 or 750 f 1/L, respectively) and with nutrient solutions with high, medium, and low N ...
Open cone with empty pine nuts. The seed cones open to 6–9 cm (2 + 1 ⁄ 4 – 3 + 1 ⁄ 2 in) broad when mature, holding the seeds on the scales after opening. The seeds are 11–16 mm (7 ⁄ 16 – 5 ⁄ 8 in) long, with a thin shell, a white endosperm, and a vestigial 1–2 mm (1 ⁄ 32 – 3 ⁄ 32 in) wing.
A seed cone takes two years to fully ripen. Each scale of the cone is tipped with a thin, brittle pickle 4–10 millimeters long. They fall from the tree soon after releasing their seeds. [5] Pinus aristata has seeds that are gray-brown to nearly black in color with darker spots and 5–6 mm long. The seed has an attached papery wing 10–13 mm ...
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