Category Archives: Flowers

Tree tobacco

Tree Tobacco (Nicotiana glauca) heralds from South America, but in Hawaii, it’s an invasive species. The chances of eradicating it are slight. Controlling its spread is a more realistic possibility. But tree tobacco is one invasive species in Hawaii that does have something going for it.

Enter Blackburn’s sphinx moth (Manduca blackburni), a large, endemic moth, once thought extinct, and a long-time resident on the endangered species list. Among its problems is that its host species, ‘aiea, (Nothocestrum spp.) has been on the decline for a while. ‘Aiea belongs to the nightshade family (Solanaceae) as does tree tobacco.

It seems that the moth, in the interests of survival, decided tree tobacco is not so bad. So we have an endangered species becoming reliant on an invasive species. Hmm. As I said, control is the most likely approach with tree tobacco and that will undoubtedly involve checking to see whether Blackburn’s sphinx moth is present before removing areas of tree tobacco.

That’s good news for the plant in this photo. I found it at Pu’u Wa’awa’a, a State Forest Reserve on the northern slope of Hualalai. Pu’u Wa’awa’a is home to a variety of endangered plants and animals including Blackburn’s sphinx moth.

For more information about tree tobacco, go to cabi.org/isc/datasheet/36324.
For more information about Blackburn’s sphinx moth, go to fws.gov/pacificislands/fauna/bsmoth.html.
For more information about Pu’u Wa’a Wa’a, go to puuwaawaa.org.

Mauna Loa silverswords bloom and die

This is the time of year when silverswords bloom. These plants, members of the sunflower family, are endemic to Hawaii. There are slightly different silverswords growing on Mauna Loa, Mauna Kea and Haleakala on Maui. The plants are very susceptible to root disturbance and the activities of goats, pigs and humans has led to their decline. They’re making a comeback now thanks to fenced enclosures and careful management.

These photos were taken on Mauna Loa a few years back. The flower stalks were about 6 to 8 feet tall. The plants live for up to 30 years, but once they bloom, they die (like the one in the background of the top photo).

In the second photo, the ongoing eruption of Kilauea’s Pu’u O’o vent can be seen.

For more information about Mauna Loa silverswords, go to nps.gov/havo/learn/nature/endangered_ahinahina.htm.

Bird of paradise

Bird of paradise (Strelitzia reginae) is one of the quintessential tropical plants with its exotic-looking, colorful flowers. While it’s common on the Big Island, it still hasn’t lost its wow factor for me.

For more information about this and other Hawaiian flowers, go to wildlifeofhawaii.com/flowers/.

Rose jatropha

Rose jatropha (Jatropha integerrima) is an ornamental shrub from Cuba with showy red flowers. Bees were all over this plant.

Cattleya orchid

I think this is a cattleya orchid, growing on the trunk of a lychee tree. This particular tree has two or three other epiphytes, plants that grow on other plants, on its trunk.

Mangoes

In February this mango tree was in full bloom (top). Those blooms have become the bevy of fruit below. When the wind blows the thud of falling mangoes is a constant sound. I tend to duck my head into my shoulders walking under the tree.