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Helonias
Helonias is a genus of flowering plants. It contains 12 species, with 11 native to the Himalayas and eastern Asia and one (H. bullata) to the eastern United States.
Some authors treat Helonias as a monotypic genus containing only H. bullata, and place the Asian species in the separate genera Ypsilandra and Heloniopsis. Noriyuka Tanaka concluded that the 12 species were broadly similar in morphological and ecological characteristics and should be placed in a single genus. Tanaka divides the genus into two sections; sect. Helonias, consisting only of H. bullata, and sect. Heloniopsis which includes the 11 Asian species. Sect. Helionopsis is composed of two subsections; subsect. Ypsilandra includes of five species previously published under the genus Ypsilandra, and subsect. Heloniopsis includes six species in two series, ser.
Text excerpted from the Wikipedia article Helonias by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
