Cycas circinalis, also known as the queen sago, is a species of cycad known in the wild only from southern India.
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Cycas circinalis is the only gymnosperm species found among native Sri Lankan flora.
The plant is widely cultivated in Hawaii, both for its appearance in landscape and interiors, and for cut foliage. In the Philippines, it is locally known as patubo, pitogo or bitogo.
The seed is poisonous. The potent poison in the seeds is removed by soaking them in water. Water from the first seed-soaking will kill birds, goats, sheep and hogs. Water from the following soakings is said to be harmless.
The plant was thought to be linked with the degenerative disease lytico-bodig on the island of Guam; however, the cycad native to Guam has since been recognised as a separate species, Cycas micronesica, by K.D. Hill in 1994.
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