No key was found for the requested taxon, but it is the only child of Micranthemum. Showing where it is keyed below.
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....3 Leaves orbicular, rounded at the base; calyx lobes uneven, 3 of the sinuses extending about halfway to the base of the calyx, the lowermost sinus extending to the base
......4 Fertile stamens 2 (with 2 staminodia without anthers, or with rudimentary anthers); calyx lobes separate, or connate at base for < ¼ the length of the calyx.
........5 Capsule lanceoloid, > 8× as long as its diameter; calyx lobes connate at the base ca. ¼ the length of the calyx