On the hawaiian islands, evidence indicates that the 50 species of plants in the the "silversword alliance" all arose from a single immigrant plant. the plants in the "silversword alliance" are extremely diverse and include trees, shrubs, lianas and other herbaceous plants. this is an example of adaptive radiation.

It is true. The Mauna Kea Silversword is highly endangered flowering plant endemic which is Hawaii island. Mauna Kea silversword is a member of the silversword alliance. The group has fifty species in the three genera of endemic Hawaii islands.
It is an erect, monocarpic single-stemmed, basically wordy herb, spirally arranged. The leaves are being covered with a dense layer of long silvery hairs, the leaves have essential ability to store water as a gel in the intracellular spaces whereby the other plants leaves they contain air in them.