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  1. Cottonwood and Balsam Poplar | Geophysical Institute

    Oct 30, 2025 · The Klukwan giant holds the national record for black cottonwood diameter. Its nearest rival, a tree near Salem, Oregon, does hold the national height record. The Klukwan …

  2. Northern Tree Habitats - Geophysical Institute

    Oct 30, 2025 · Interior Alaskan forests have only six native tree species: white spruce, black spruce, quaking aspen, balsam poplar, larch (tamarack) and paper birch. Northern Canadian …

  3. More on Why Tree Trunks Spiral | Geophysical Institute

    Oct 30, 2025 · I eventually found a tree with a spiral lightning mark and it followed the spiral grain exactly. One tree, of course, proves nothing. "But why should the tree spiral? More speculation …

  4. Tree Rings and History | Geophysical Institute

    Oct 30, 2025 · A tree's age can be easily determined by counting its growth rings, as any Boy or Girl Scout knows. Annually, the tree adds new layers of wood which thicken during the …

  5. The majesty and mystery of Alaska yellow cedar | Geophysical …

    Jul 23, 2021 · A tree near one of our campsites had a crack at its base through which we could pass the folded saw. Yet the tree was still alive, with just one rope of cambium — the outer …

  6. Feltleaf willows: Alaska’s most abundant tree | Geophysical Institute

    May 25, 2023 · The most plentiful moose food in the state — and probably Alaska’s most numerous tree — is the feltleaf willow, which was once called the Alaska willow. As its name …

  7. Kannada pocket guide for Common Avenue trees of Karnataka

    A citizen friendly pocket-sized book in Kannada describes commonly found avenue trees, filling the paucity of such resources in the local language while also

  8. Pollen season arrives, blame the trees | Geophysical Institute

    May 7, 2008 · The airborne invaders are grains of tree pollen, specks so small that it would take eight of them to cover the period at the end of this sentence. The air is rich with pollen …

  9. The war within the aspen leaves | Geophysical Institute

    Jul 31, 2025 · They think the fierce, silent conflict has probably benefited both the insect population and a tree that’s been under siege in Interior Alaska for a long time. Leaf miners …

  10. The largest black spruce in Alaska | Geophysical Institute

    Aug 16, 2010 · The tree leans uphill, and its trunk is 45 inches around. When I hugged it, I could barely clasp my hands together. The largest black spruce in Alaska is a lucky tree, because its …