Need Help with Plant Identification -- Figure it out :)

I ordered Rotala Sp. Pearl, and they grow really nice in my tank. After a while one plant from those batch of rotala pearl leaves keep growing bigger and bigger, and grow into a totally different appearance, very beautiful, but I am not sure if it's still the same plant, or is it a different stem being mixed in.

From one stem, it grows to several. To the left corner, that's my rotala sp pearl.

It grows pretty fast in my high tech planted tank.

The top 1st photo was taken May 16th. And this was taken yesterday June 10th.

All those stems are from one single stem.

Attached my rotala sp pearl photo.

Add on  June 12, 2016

Thanks for plantedtank forum members' help.
This is rotala macrandra green. Rotal sp Pearl is a mutationfrom rotala macrandra green. Some mutation strain is not stable and ends up reverting back.

Either way, those are both beautiful plants I love :)

Golden Lloydiella Lysimachia Nummularia

Common Name: Golden Lloydiella

Scientific Name: Lysimachia Nummularia Golden

Care Level: Moderate

Lighting: Moderate - Strong

Rotala Sp Pearl

Aquatic Plant Rotala Sp Pearl

Care level: Medium

Light: Medium to Strong

CO2: Recommended

Position: For-ground to Mid-ground, excellent mini plants for nano aquarium

Rotala Sp. Pearl is a very small delicate stem plant. It's distinguished itself with leaves curved downward, and color: green, pink and purple. Strong lighting and good CO2 and nutrient supply are recommended for the plants to flourish. It's great to be planted in a group in for-ground or mid-ground, especially great for Aquascaping in a Nano Planted tank. 

Hygrophila difformis Water Wisteria

Alternanthera Reineckii Mini

Ammania Bonsai