Sphenostemon is the only genus in the monotypic family of plants Sphenostemonaceae of small evergreen trees or shrubs endemic to New Guinea, Queensland, Australia and New Caledonia.[1] The Angiosperm Phylogeny Group II considers the family unplaced as to order within the euasterids II clade; however, some authorities place Sphenostemonaceae in the Dipsacales.[2]
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