Category: Learning Outdoors (Page 20 of 63)

Seed of the Week: Common Figs

The mystery seeds from last week were indeed from figs, as alert readers Heather and Shannon correctly surmised.

The seeds are from a dried fruit of the common fig, Ficus carica.

Figs are sweet and eaten both fresh and dried. They are used in cooking and baking, such as the fig cookies I mentioned. Figs are nutritious, being high in calcium and fiber.

Common fig trees are frost sensitive, so they grow in warmer climates. Figs grow here in Arizona. California is known for its commercial fig production.

The common fig is easy to recognize because leaves are deeply lobed.

The cultivars of figs that are eaten fresh can self-pollinate, and thus produce fruit without help of pollinators.

The cultivars of trees used to produce dried figs, however, require tiny wasps for successful pollination and fruit production. In what is probably one of the most complex forms of pollination in the world, the fig wasps ( Blastophaga psenes) develop within a swollen structure that resembles a fruit, but which actually contains the fig flower. The emerging female wasps pick up pollen (while still inside), crawl out off a hole dug by the male wasps, and then fly on to another fig to pollinate it. This from wasps so tiny and fragile that a slight breeze could blow them away. Cool!

The creeping fig vine from Asia, Ficus pumila, will also grow in Arizona. Recently ours has started to produce these fruit-like structures. The creeping fig is pollinated by another fig wasp, Blastophaga pumilae. I understand it is possible to make a jelly from these figs.

The Nature program has a show about a related fig tree from Kenya. It is called the sycamore fig, Ficus sycomorus. It is also pollinated by tiny wasps. Here’s the beginning part, which actually captures some of the wasps in action.

Figs are definitely interesting plants.

For more extensive information about figs and fig wasps, see:

Fig information from South Africa

Are you using any figs for cooking this holiday season? Do you have any favorite fig recipes?

Mystery Seed of the Week fans: Mystery Seed will resume next Tuesday.

Bug of the Week: Desert Headstanding Beetles

After years of living in the Sonoran desert, I finally got a photograph of a clown beetle, Eleodes species, standing on its head.

These shiny black beetles are common in the Southwest. They are called a number of different names, such as desert stink beetles, clown beetles, pinacate beetles, and headstanding beetles.

Why would a beetle stand on its head? Why is it called a stink beetle?

It stands on its head probably for two reasons. Eleodes beetles are the skunks of the insect world. They can spray nasty chemicals from their rear, the tip of their abdomen. By assuming the posture, like a head standing spotted skunk, they are warning predators that they are about to spray. If the predator continues to advance, they are in position to do the most amount of damage with their spray.

The business end of an Eleodes beetle

You might also notice the hard wing covers, or elytra. They are fused shut and the beetles are not able to fly.

What do they eat? The adults scavenge plant and animal debris. The larvae are a type of wireworm. They live mostly underground and feed on plant material. The adults also stay underground during the heat of the day.

In an effort to show you the spotted skunk doing its head stand for comparison, I found this video from the BBC.  It shows a spotted skunk against an urban backdrop, with dancers mimicking its motions. Note:  At one point the one of the actors is spraying graffiti and seems to spray the skunk. It is a statement about spraying chemicals, and the result of film editing, but it might be disturbing to small children. Also, this video has a pop-up ad.

It is pretty amazing how both the beetle and the spotted skunk have similar behaviors.

Have you ever seen a beetle or a spotted skunk standing on their heads? Or maybe I should say hand standing beetles?

Seed of the Week: Osage Orange

As Rebecca correctly identified, the mystery seeds last week were from an Osage orange tree, Maclura pomifera. Osage orange has an interesting history.

Let’s take a look at the name first. The name Osage comes from the American Indian tribe. The Osage Indians apparently prized the wood of this particular tree because it makes superior bows.

How about orange? Botanically, this tree is related to mulberries rather than citrus and it belongs to the family Moraceae. Although shaped roughly like an orange, the fruit is bitter, full of latex, and not edible.  However, it does give off a faint odor reminiscent of citrus, which is probably the source of the name. It is also called  a number of other common names, such as horse apple.

The trees have a rough, light-colored bark.

Up close, you can see the exposed areas show an orange color.

According to A Splintered History of Wood by Spike Carlson, Osage orange was originally found in the Red River Valley region of Oklahoma and Texas. In the late 1800’s and early 1900’s literally miles of the trees were planted as hedgerows throughout the Midwest.

The young plants have thorns on the branches. A thick planting will create a natural barrier to livestock.

Later, as barbed-wire fences replaced natural tree hedges, the trees were found to have strong, rot-resistant wood good for fence posts.

The fruit are wrinkly green balls. When I was looking for more photographs of the fruit, I found this fun video by DNLee of Urban Science Adventures showing some Osage orange trees in a park in Missouri.

Can you grow new trees from the fruit? Yes, you can. If you bury sections of fruit with intact seeds in moist soil, they will germinate. If you plant the entire fruit, you will end up with a tangled mass of seedlings. They will also grow back from the roots if you chop off the stem.

Have you ever seen Osage orange trees?

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For more about how the wood is used, see: A Splintered History of Wood: Belt-Sander Races, Blind Woodworkers, and Baseball Bats

(Affiliate Link goes to Amazon)

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