Cyathea sinuata is unique among the tree ferns in that it has entire leaves, not pinnate or lobed. It is native to Sri Lanka

Sri Lanka

Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka is a country off the southern coast of the Indian subcontinent. Known until 1972 as Ceylon , Sri Lanka is an island surrounded by the Indian Ocean, the Gulf of Mannar and the Palk Strait, and lies in the vicinity of India and the...

but rare, being only known from one local forest area. It is one of the smallest species of tree ferns, growing only about one meter (3.3 feet) tall, with fronds 60 to 90 centimeters (15 to 23 inches) long.