Haworthia truncata 'Lime Green'
Native range: South Africa
Known names: Horse Teeth
Hardiness: Down to 30°F, heat tolerant
Mature Size: ~1.5" tall, cluster-forming
Light: Bright indirect light, morning sun. Direct hot sun can burn the plant.
Water: Drought tolerant, water when soil is dry.
Soil: Succulent mix
Dormancy Period: Winter
Pet-Safe: Yes
Plant Size: 2.5" pot
 
Haworthia truncata 'Lime Green' forms a fan-shape cluster as they grow. This cultivar produces yellowish-green leaves instead of the standard dark green. The tips of the leaves are flat with "windows" to allow light to penetrate the leaves (they naturally grow mostly underground in the wild). 
This Haworthia is VERY slow growing so patience is a must.