Abstract
Small perennial herbs, mat-forming to upright. Leaves opposite, subsessile, joined at the base by an interstipular sheath; lamina linear to broadly ovate. Flowers mostly solitary or in leafy cymes, actinomorphic, 4-merous, minute. Corolla white, tube subrotate to campanulate, with imbricate aestivation. Calyx campanulate, persistent, with lanceolate to ovate-obtuse lobes. Sepals and petals connate at the base. Stamens alternate with the petals, inserted on corolla; anthers introrse, dorsifixed, bilocular with two distinct thecae; dehiscence longitudinal. Pollen tricolporate. Gynoecium bicarpellate, syncarpous. Ovary partly inferior, style terminal (Polypremum), or ovary superior, style gynobasic (Tetrachondra), stigma slightly truncate to capitate. Ovules anatropous, unitegmic, and tenuinucellate. Placentation basal or the ovules on peltate placentae attached to septum. Fruit a bivalved capsule or reduced to four nutlets. Seeds with copious endosperm. Embryo straight.
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Wagstaff, S.J. (2004). Tetrachondraceae. In: Kadereit, J.W. (eds) Flowering Plants · Dicotyledons. The Families and Genera of Vascular Plants, vol 7. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-18617-2_23
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DOI: https://doi.org/10.1007/978-3-642-18617-2_23
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