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Desert Willow

Plants in the desert must live under very difficult conditions.  Temperature extremes, from hot to cold, and the lack of moisture are the big issues.  On top of all that, the soil is full of salt.  The Desert Willow is no exception.  It has adapted to life in the desert.  Its bright flowers also provide a surprise to people who don't expect anything but brown grass and spines in the desert.

The Desert Willow is not really a willow.  It's a member of the Bigonia family.  No other Begonia grows in the entire state.  It grows in northern Mexico, southwestern Texas, and through to Southern California.  If makes its home in the Sonoran, Mojave, and Chihuahuan deserts. 

Often the Desert Willow is huge.  The trunk can be as much as 6 inches thick.  It's also quite long – reaching up to 25 feet.  The leaves are 3 inches to 6 inches in length, with a very sharp tip.  The flowers, which look like orchids, grow to up to two inches long.  Fruit is shaped like a cigar and can reach 8 inches in length.  The fruit contains winged seeds.

The Desert Willow has long roots that pool water all the way from the deep water table.  When you see flowers, that means water is nearby.  It could be standing water you seeing, or water deep below the ground.  It does not produce flowers when conditions are dry.  A desert wanderer can look for these flowers to find water.  Very dry deserts, like the Atacama Desert, where only 1 mm of waterfalls each year, won't have the Desert Willow. 

The Desert Willow also has another name, Mimbre.  The Mimbre, a Spanish name meaning willow-like, is sometimes used to make a tea.  That's done with the seed pods and dried flowers.  People make fence posts out of the trunks.  The plant is therefore an integral part of human life in deserts where the plant grows.

Not exactly what people expect in a desert plant, the Desert Willow still survives.

A 10 foot long pole leans against a wall. The bottom is 6 feet from the wall. How much farther should the bott?

A 10 foot long pole leans against a wall. The bottom is 6 feet from the wall. How much farther should the bottom be pulled away from the wall so that the top moves the same amount down the wall?

We can calculate the height of the wall where the ladder is touching by using the Pythagorean theorem:

6^2 + h^2 = 10^2
36 + h^2 = 100
h^2 = 64
h = 8

We now have a right triangle, with a base of 6', height of 8', and hypotenuse of 10' (the length of the ladder). The question is asking for the distance where the top moves down the same as the bottom moves across.

(8 - x)^2 + (6 + x)^2 = 10^2
(64 - 16x + x^2) + (36 + 12x + x^2) = 100
100 - 4x + 2x^2 = 100
2x^2 - 4x = 0
2x(x - 2) = 0
x = 0, 2

So, the bottom of the ladder should be move 2'.

Hope this helps...good luck!

Tanzania: Travel - Lake Tanganyika From a Zambian View (All Africa)

Creating a 677 km long boundary, Lake Tanganyika stretches through Tanzania,
Burundi, DRC and Zambia. Its great deepest is associated with the Great Rift
Valley, which has also created its steep shoreline, with a depth of 1,433
metres (4,700 feet), which is an astounding 642 m below sea level. It was
allure of this famous lake, which lured me to visit.

All Africa

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