Tag Archives: Ohia

Ka’u Desert Trail

This week’s Sunday Stills challenge theme is ‘I’d Rather Be…’ See more responses here.

It had been a while since I went hiking, for various reasons, and it’s something I was missing, something I’d rather be doing. So last week, I headed down to Hawaii Volcanoes National Park to try the Ka’u Desert Trail. This backcountry trail has been on my list for a long time, but I had never done it before. For one thing, it’s about as far from my house as one can get on the island. For another, it’s directly downwind from Kilauea Volcano, so when the volcano is active and the trade winds are blowing, gasses blow across the length of the trail.

The latest eruption of Kilauea is currently either paused or over, so gas emissions are much reduced, and last week, the trade winds had given way to winds from the southwest. So off I went.

A sign on the Ka'u Desert Trail, Hawaii — Signs explain the rich history and geology of the area.

An ohia the Ka'u Desert Trail, Hawaii — Signs explain the rich history and geology of the area.

The trailhead is several miles west of the main entrance to the park, with a strip of parking along the highway. The first mile of the hike is also known at the Footprints Trail. It’s a sort of paved path that threads through ohias to a small building that houses footprints left by early Hawaiians in volcanic mud and ash. Alas, I couldn’t identify any footprints in the display. Shortly after the footprints, the path breaks out of the vegetation into open lava fields. This isn’t a tropical Hawaii walk, this a bleak hellscape Hawaii walk. Or is it?

The Ka'u Desert Trail, Hawaii — A view of the Kamakai’a Hills from the trail junction.

The trail ascends gently to the only junction for miles around, at Mauna Iki. To the left is a trail back towards the heart of the park. The Ka’u Desert Trail heads to the right and into backcountry wilderness. Mauna Iki was the site of an eruption in 1919 and the trail traverses the lava fields from this eruption.

Ropey pahoehoe lava on the Ka'u Desert Trail, Hawaii — A’a and pahoehoe lava flows can be seen side by side.

Much of the trail is over pahoehoe lava, which is rounded and much easier to walk on than jagged a’a lava. The trail is marked by cairns and single rocks placed alongside it. It’s pretty easy to follow with just one or two parts where attention has to be paid to make sure one doesn’t stray.

Bronze pahoehoe lava on the Ka'u Desert Trail, Hawaii — Bronze colored lava.

Colored lava on the Ka'u Desert Trail, Hawaii — Bronze colored lava.

It wasn’t far along this part of the trail that I first encountered blue lava. That’s right, blue lava. Who knew? But not just blue. There’s bronze, pink, red, orange, gold, and who knows what. I’ve seen colorful lava on the Puna Coast Trail, but this was more varied and quite wonderful. In places the trail crossed this colorful lava and I felt bad for walking on it, though as I hiked I could see many more patches of color out in the lava fields. It’s not wise to leave the trail since there are many lava tubes, some with very thin ceilings.

This is an out and back trail and I turned around once I reached the Kamakai’a Hills, after about 5 miles. It’s another 2 or 3 miles to the next junction where there is a small cabin.

Also posted for Jo’s Monday Walk. See more responses here.

Ohia

This week’s Sunday Stills challenge theme is ‘Geometric–explore various angles.’ I’ve focused more on the ‘various angles’ than the geometric.

Ohia trees (Metrosideros polymorpha) are endemic to Hawaii and the flower of these trees is the official flower of the Big Island. Depending on growing conditions, ohias can vary from ground hugging shrubs to 50 foot trees. They grow at sea level and at elevations up to 8,000 feet. They’re probably most noted for two things. One is their brilliant display of flowers. The other is that they’re usually the first plants to recolonize lava flows.

They grow in lava is because their roots reach down into lava tubes and tap into the moisture available there. But ohia can also put out aerial roots to gather moisture. They’re very flexible in this way.

Ohia flower buds begin to reveal the flower within. — Buds form

The puffball flowers are actually clusters of flowers. Each flower is made up of a bunch of stamens (the male part of the flower) and a single pistil (the female part) which is thicker and longer than the stamens. When the flowers have been pollinated, the stamens fall away until only the pistil remains. This too will disappear as the calyx, where the seeds are found, develops. Eventually, the calyx will dry out and release the tiny mature seeds, to be dispersed by the winds, and hopefully grow into new ohia trees.

An ohia flower after pollination — The stamens fall off…

Ohia flowers after pollination — The stamens fall off…

Also posted in response to Becky’s July Squares challenge theme of ‘Trees.’ See more responses here.

Halemaumau Crater

The latest eruption at Kilauea Volcano has recently been declared paused. It was never an especially dramatic eruption, but when I went down a few days after it began (here) the sky was illuminated by the activity. In recent weeks though, the lava lake formed by the eruption crusted over completely and lava from the active vent was also hidden from view.

The photos are two views of Halemaumau Crater, taken before this latest eruption. In the top one, the collapsed floor of the crater is on the left. This is what the new lava lake was filling up. On the ridge, to the right side of the photo, is the low profile of the Jaggar Museum, which was closed after the 2018 eruption and likely won’t reopen.

The bottom photo shows the easternmost edge of Halemaumau Crater, which wasn’t greatly impacted by this eruption or the events of 2018. Consequently, the walls of the crater are quite green and the floor is dotted with plants. These plants are mostly ohia trees, which are among the first plants to grow in lava fields, in part because their roots will tap into lava tubes to find moisture and nutrients.

For more information about Hawaii Volcanoes National Park and Kilauea’s eruptions, go to nps.gov/havo/.

A view of Halemaumau Crater from the Byron Ledge Trail in Hawaii Volcanoes National Park

Ohia lehua flower close up

A bee forages on an ohia lehua flower.

Posted in response to Becky’s January Squares challenge theme of ‘Up.’ See more responses here.

Part of Crater Rim Drive in Halemaumau Crater

Halemaumau Crater, at the summit of Kiluaea Volcano, underwent profound changes during the 2018 eruption. When lava drained from the summit vent, the crater floor experienced a series of collapses, radically changing the appearance of the crater and its surrounds.

I had seen this area from the air and posted about it (here). The middle photo was taken during that flight and shows where a section of Crater Rim Drive slid into the crater. When I last visited the park, I got a different view of this.

The recently reopened Byron Ledge Trail has good views across the crater. In the top photo, the chunk of road is clearly visible with its white line running down the middle of it. The bottom photo shows the longer view across the crater with the road in the distance. In the center of the photo, equipment used to monitor the volcano’s activity, can be seen. The tree in the foreground is an ‘ōhi‘a lehua with its brilliant red flowers. It’s an early colonizer of new lava flows and all those little dark spots on the main crater floor are ‘ōhi‘a lehua trees, mostly still shrub-sized at this time.

Ohia Lehua flower

This week’s Sunday Stills challenge theme is ‘Country or State Flower.’ See more offerings here.

The country flower for the USA is the rose and I don’t have photos of those. The state flower for Hawaii is the hibiscus and, while I have lots of those, they’re all of Chinese hibiscus (Hibiscus rosa-sinensis). The state flower is the native yellow hibiscus (Hibiscus brackenridgei) and I have none of those. The native hibiscus is not often seen in the wild and is currently considered an endangered species, but it is used as an ornamental in domestic gardens.

Having struck out on the two proper responses to this challenge, I’ve chosen to post photos of the official flower of the Big Island, the red ʻōhiʻa lehua (Metrosideros polymorpha). A member of the myrtle family, ʻōhiʻa lehua is endemic to Hawaii. It’s one of the first trees to colonize lava flows. It’s able to survive in such a tough environment because its roots grow down into lava tubes and other voids in the lava and tap into the moisture there.

Recently, ʻōhiʻa trees have been attacked by a fungus which can cause the trees to die within a very short time. This disease, known as Rapid ‘Ohi’a Death, is caused by two new types of Ceratocystis fungus.

Ohia growing in the lava

The ohia flower is the official flower of the Big Island. It’s an appropriate choice for the volcanically active island since the ohia is one of the first plants to get a foothold in lava flows. When the bright red flowers are in bloom they give a splash of color to the otherwise black lava flows.

Mossy ohia tree

In a strong contrast of textures, the base of a gnarly old ohia tree is covered in a soft coating of moss.

Graham's Island

Life on the Big Island of Hawaii