Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.
1 Fertile stamens 4; calyx lobes connate at anthesis for > ½ their length, later separating
..2 Capsule lanceoloid, > 8× as long as its diameter; calyx lobes connate at base < ¼ the length of the calyx
......4 Leaves primarily in a basal rosette, leaves of the stem strongly reduced upward to bracts; capsule (1.8-) 3.4-7 mm long; [primarily of seepage of flatrocks]
......4 Leaves primarily on the stem, not conspicuously reduced upward; capsule 1.4-3.4 mm long; [of stream or river banks]
........5 Leaves nearly orbicular, the blades about as wide as long; stems prostrate, creeping, forming mats; [s. GA south to s. FL]
..........6 Leaf blades 5-15 mm long; lower leaves (and upper as well) widest at base and rounded or clasping; bracteal leaves subtending flowers much smaller (< 1/2 × as long) than the lower stem leaves; pedicels much longer than the reduced bracteal leaves subtending them; flowers all chasmogamous (opening)
..........6 Leaf blades 10-30 mm long; lower leaves narrowed towards the base; bracteal leaves subtending flowers only somewhat shorter than lower stem leaves; pedicels shorter than or somewhat longer than the slightly reduced bracteal leaves subtending them; flowers all or in part cleistogamous (remaining closed).
............ 7 Pedicels 5-20 mm long; leaves acute to obtuse at the apex; some flowers on a plant chasmogamous; [widespread and in many damp habitats]
............ 7 Pedicels 1-5 (-10) mm long; leaves obtuse to rounded at the apex; no flowers (usually) on a plant chasmogamous; [tidal shores, VA northwards]