habitat degradation caused by axis deer and cattle
competition with various alien plant species
destruction by off-road vehicles
There are two populations of Sesbania tomentosa in the Northwestern Hawaiian Islands. One population is on the island of Nihoa and consists of several thousand individuals and the other is on Necker Island (population size data not available). The species is known to exist on the privately owned island Niihau although the number of plants there is still unknown. On Molokai there are four populations on private and State-owned land from Kamiloloa to Makolelau totaling fewer than 2,000 individuals and another three populations from Moomomi to east of Hinanaulua consisting of about 100 to 150 plants on state and private land. On Lanai, there is a cluster of 3 populations between Paomai and Maunalei on privately owned land and includes at least 12 individuals growing on arid slopes. On Maui there are two sites on West Maui and two on East Maui. On West Maui, one plant is on State-owned land below Lihau Peak and near Nakalele Point to Puu Kahulianapa and there is a cluster of 4 populations containing about 50 to 75 individuals on state, Maui Co. and private land. On East Maui, there are two trees exist on private land in Kamaole (but they appear to have been planted) and a population of thirteen plants located on the Hawaii National Guard Kanaio Training Area. Approximately 25 to 30 individuals of Sesbania tomentosa are found on the islet of Puu Koae, a State-owned seabird sanctuary. On the island of Hawaii, Sesbania tomentosa is known in two regions of the southeast coast and two areas along the northwestern coast. On the southeastern coast between Ka Lae and Kaalela is a cluster of populations on State-owned land containing an estimated 260 individuals. The second cluster is in Hawaii Volcanoes National Park. These scattered populations contain at least 50 individuals. On the northwestern coast, a single plant occurs on private land at Kaupulehua. The other northwest coast population of eight plants and several seedlings is also on private land at Waiakailio. (USFWS 1993)
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