Ihi
Portulaca lutea
This is a flat, healthy, and enjoyable herb. The leaves are oval to round and range in size from 3/8 of an inch to 1 inch. One to three yellow flowers are born at the ends of the stems.

 
Ihi can grow in various coastal areas from lava to sand dunes.
  Indigenous to Hawai'i it is widespread throughout the Pacific Islands except Kaua'i. It is more common on windward coasts than leeward coasts. It is also found on offhsore islands. Ihi can grow among lava, coral and sand dunes.