|Haleakalā silversword (A. sandwicense subsp. macrocephalum)|
The plant species Argyroxiphium sandwicense is a kind of silversword. It is endemic to Hawaii. There are two subspecies which are separated by geography. Both subspecies are rare, threatened, and federally protected.
- Haleakala silversword (A. sandwicense subsp. macrocephalum) is found on the mountain Haleakalā on the island of Maui at elevations above 2,100 meters. It is a federally listed threatened species.
- Mauna Kea silversword (A. sandwicense subsp. sandwicense) is found on the mountain Mauna Kea on the Big Island at elevations above 2,600 meters. This is a federally listed endangered species. There may be only 40 wild individuals left.
The Hawaiian silversword flowers only once in its life of 20 to 90 years. It may not survive the ravages of climate change, according to a new study in Global Change Biology.
- Media related to Argyroxiphium sandwicense at Wikimedia Commons
- USDA Plants Profile - Argyroxiphium sandwicense (Silverswords)