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The seed cones are slender, 8–16 cm (3 + 1 ⁄ 4 – 6 + 1 ⁄ 4 in) long (rarely longer than that) and 4–5 cm (1 + 1 ⁄ 2 –2 in) broad when open, and have scales with a rounded apex and slightly reflexed tip, often resinous.
For seeds of many species, light is also necessary, and facilitates the germination of seeds in other species, [7] but spruces are not exacting in their light requirements, and will germinate without light. White spruce seed germinated at 35 °F (1.7 °C) and 40 °F (4.4 °C) after continuous stratification for one year or longer and developed ...
The ovary is 3-celled, with 2 ovules in each cell, [9] but the fruit typically produces a single seed with large cotyledons. [4] The average weight of the mature fruit (± SE ) is 72.6 (± 4.4) g; the fruit has a thick and hard pericarp and bulky cotyledons weighing about 13.2 (± 1.4) g.
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 ...
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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.
Longleaf pine (Pinus palustris) is a pyrophile, depending on fire to clear the ground for seed germination. [4] The passage of fire, by increasing temperature and releasing smoke, is necessary to raise seeds dormancy of pyrophile plants such as Cistus and Byblis an Australian passive carnivorous plant. Imperata cylindrica is a plant of Papua ...
The seeds are small, 4–7 mm (3 ⁄ 16 – 1 ⁄ 4 in) long, and have a long slender wing 15–22 mm (9 ⁄ 16 – 7 ⁄ 8 in) long. The branches are borne in regular whorls , [ 5 ] produced at the rate of one a year; this is pronounced in narrow, stand-grown trees, while open specimens may have a more rounded form with wide-reaching limbs.