Pearlweed (Hemianthus Micranthemoides) also know as Micranthemum Micranthemodes

Petite, easy to grow with fast dense growth in high light, longer stem growth in lower/moderate light. 
prefers acidic to neutral water. 

Care Info:

• Ideal Temperature - 70° - 86° F (21° - 30° C) 
• Light - medium - high
• pH - 5.5 - 7.5
• KH - 2 - 15 dKH
• Propagation - trim and replant tops / tops can float in mass to provide fry cover similar to guppy grass
• Origin - Florida, USA
• Difficulty - easy