David Fleetham / Hawai'i silversword (Argyroxiphium sandwicense macrocephalum) covered by an unusual snowfall near crater summit of dormant Haleakala / East Maui Volcano. Haleakala National Park, Maui, Hawaii. Feb...

David Fleetham / A rare Haleakal silversword plant (Argyroxiphium sandwicense macrocephalum) in the early stage of blooming, Maui, Hawaii.

Kevin Schafer / Haleakala Silversword (Argyroxiphium sandwicense) pair, Haleakala Crater, Maui, Hawaii

David Fleetham / Haleakala silversword (Argyroxiphium sandwicense macrocephalum), endemic to the slopes around Maui's dormant volcano, with horse riders on trail, Hawaii. Model released.

David Fleetham / Horse riders on trail out of Haleakala Crater, Maui's dormant volcano, stopping to look at the endemic Haleakala silversword (Argyroxiphium sandwicense macrocephalum), Hawaii. Model released.

Doug Perrine / Mauna Kea silversword (Argyroxiphium sandwicense) growing on the slopes of the Mauna Kea volcano, with Pu'u Kole cinder cone and Mauna Loa volcano behind, Big Island, Hawaii, USA.

Doug Perrine / Mauna Kea silversword (Argyroxiphium sandwicense) in flower on slope of Mauna Kea volcano, with Pu'u Kole cinder cone and Mauna Loa volcano behind, Big Island, Hawaii, USA.

Doug Perrine / Mauna Kea silversword (Argyroxiphium sandwicense) in flower on slope of Mauna Kea volcano, with Pu'u Kole cinder cone and Mauna Loa volcano behind, Big Island, Hawaii, USA.

Doug Perrine / Mauna Kea silversword (Argyroxiphium sandwicense) in flower on slopes of Mauna Kea volcano at night, with Milky Way above, Big Island, Hawaii, USA.

Roland Seitre / Haleakala Silversword (Argyroxiphium sandwicense), Haleakala National Park, Maui, Hawaii

Roland Seitre / Ladybird (Coccinellidae) crawling on Hawaii silversword (Argyroxiphium sandwicense) leaf. close up, Haleakala National Park, Maui, Hawaii. Endangered.

Roland Seitre / Hawaii silversword (Argyroxiphium sandwicense) growing in volcanic rock, Haleakala National Park, Maui, Hawaii. Endangered.