[Phemeranthus rugospermus] Flameflower or flower-of-an-hour or Prairie Flame-Flower or Rough-Seeded fameflower Portulacaceae:
Rosette forming plants with round flowers that open in the afternoon, each flower opens for only one day. An attractive species for a sandy-rocky soil, nice rock garden addition or for a dry prairie planting.
Native to the central states of the USA. Surface sow the seeds, light needed for best germination.