 Wildlife refuge staff visited the island during the dry season at least 21 times between 1983 and 1996.Originally, botanists thought the absence of the plant in field surveys might have been explained by the time of visits During the summer months, the stems of "A. brownii" dried up and could not be distinguished from other herbaceous plants.However, a seven-day visit to the island in April 2006 still did not find any specimens.