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..2 Flowers in axillary cymes; capsule subglobose; leaves 2-12 cm long
..2 Flowers solitary or paired in the leaf axils; capsule cylindrical; leaves 0.8-1.5 (-3.5) cm long
......4 Leaves pinnatifid into 7-13 lanceolate lobes; calyx lobes lacking auricles in between; capsule 4-seeded; seeds lacking an elaiosome
......4 Leaves pinnate with into 3-13 obovate segments; calyx lobes alternating with reflexed or spreading auricles; capsule 1-4-seeded; seeds with a persistent elaiosome
........5 Inflorescence repeatedly branched subdichotomously; larger leaf blades > 8 cm wide; stamens well exserted from the corolla (3 mm or more beyond the corolla); plants perennial from fibrous roots; [tribe Hydrophylleae]
........5 Inflorescence with a strong central axis (some secondary branching in P. bipinnatifida, but not as above); larger leaf blades < 5 cm wide (except P. bipinnatifida); stamens slightly exserted from the corolla (< 3 mm beyond the corolla) (except well-exserted in P. bipinnatifida, included in P. covillei); plants annual (biennial in P. bipinnatifida) from a taproot; [tribe Romanzoffieae]