ABUTILON EREMITOPETALIUM

Image: calphotos.berkeley.edu

This plant is commonly known as the Hidden-petaled Abutilon or Hiddenpetal Indian Mallow, is a species of flowering shrub in the mallow family, Malvaceae. It is endemic to dry forests and low shrublands on the windward side of the island of Lānaʻi in Hawaii. It is classified by the IUCN Red List as critically endangered by habitat destruction. The species was first discovered in 1987.

This plant faces threats of extinction  from the following:

Alien plant competition

Alien plants tend to invade native plants space and take over their space leading to their extinction.
source:  alien plant competition

Browsing and trampling by axis deer

The axis deer which is found in Hawaii tramples and destroys this plant leading to its extintion.
source:  Browsing and trampling by axis deer

Stochastic extinction caused by low numbers  

Small populations are generally at a greater risk of extinction because environmental fluctuations due to variation in predation, competition, disease and food supply; and natural catastrophes that occur at irregular intervals, such as fires, floods, volcanic eruptions, storms and droughts. 
source:  Stochastic extinction caused by low numbers

 Source of this article: http://www.centerforplantconservation.org/