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Metrosideros polymorpha is the most common native tree in the Hawaiian Islands, tolerating a wide range of soil conditions, temperature, and rainfall. It grows from sea level right up to the tree line at elevations of 2,500 m (8,200 ft) and is commonly found in moist and dry forests , high shrublands , and is a colonizer of recent lava flows. [ 8 ]
The Hawaiian tropical rainforests are a tropical moist broadleaf forest ecoregion in the Hawaiian Islands. They cover an area of 6,700 km 2 (2,600 sq mi) in the windward lowlands and montane regions of the islands. [1] Coastal mesic forests are found at elevations from sea level to 300 m (980 ft). [2]
The wet forest largely consists of native plants that are also found on other Hawaiian Islands. Notable species of endemic plants that are federally endangered and are found in the area include: Kauai geranium (nohoanu, Geranium kauaiense), a critically imperiled species whose population was estimated as a total of 140 plants in 2010
It is a small gray-barked tree, reaching on average a height of 6–10 metres (20–33 ft) [4] and an average trunk diameter of 0.3 m (0.98 ft). [5] Around 1/8 inches long, the fuzzy brown seeds of the hibiscus waimeae plant are enclosed in protective oblong pods.
Upper branches of a koa tree, showing the bark, sickle-shaped phyllodes, greenish rounded flower heads, and seedpods. Koa is a large tree, typically attaining a height of 15–25 m (49–82 ft) and a spread of 6–12 m (20–39 ft). [6]
The Hawaiian lobelioids are a group of flowering plants in the bellflower family, Campanulaceae, subfamily Lobelioideae, all of which are endemic to the Hawaiian Islands. This is the largest plant radiation in the Hawaiian Islands, and indeed the largest on any island archipelago, with over 125 species.
Wiliwili trees grow to a height of 4.5–9 m (15–30 ft) with a gnarled and stout trunk that reaches 0.3–0.9 m (0.98–2.95 ft) in diameter. The bark is smooth, slightly fissured, and covered in gray or black spines up to 1 cm (0.39 in) in length.
By May 2018, infected ʻōhiʻa trees were found on the island of Kauai, prompting requests that members of the public limit transportation of ʻōhiʻa products within the island. [7] The less aggressive of the two fungus species, C. huliohia, has been confirmed on Hawaii Island, Kauai, Maui, and Oahu. [4]