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Seed of the Week: Desert Senna

Our wrinkly mystery seeds from last week were from desert senna, Senna covesii.

desert-senna-lynne

Often it is the desert senna’s bright yellow flowers that catch your eye, standing out against the gray-green foliage.

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You might also “hear” the flowers because the bees that are attracted to them buzz pollinate, hanging onto the anthers and making a loud buzzing noise to vibrate the pollen loose.

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You can even hear the plant when there aren’t any bees. As my friend Lynne points out, “You usually hear it before you see it. It can be in a non-blooming stage and you won’t notice it but you hear it rattle.” That characteristic has led to common names such as rattleweed or rattlebox.

mystery-seed-1s-pod

The sound is produced by the loose seeds rattling in the seed pods. Eventually the pods split open, releasing the seeds. The open pods stay on the plant for some time.

Desert senna is native to the Southwest, so it doesn’t require much water. It is a low-growing perennial, reaching about two feet tall.

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In addition being attractive to bees, desert senna is also a host plant of the cloudless sulphur butterfly. It would make a wonderful addition to butterfly gardens.

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Thank you to Lynne for all her help and contributions to this post.

The Amazing Fossil Book Giveaway

We have a special book for STEM Friday today.

The word about Fossil by Bill Thomson is simply, “Wow!”

Fossil cover

In this new wordless picture book, the intended storyline follows a boy and his dog walking on a beach. When the boy accidentally cracks open a fossil of a fern, actual ferns emerge. When they break open a fossil dragonfly, a living dragonfly skims away. The next fossil the boy opens is…

Because it is a wordless book, the reader is the one who develops the story based on the illustrations. It can change every time you read the book.

The book trailer is a great way to see how it can work:

 

Isn’t that amazing? By the way, Bill Thomson’s stunning illustrations are all done by hand, using acrylic paint and colored pencils.

Giveaway

Would you like to win a copy? Two Lions/Amazon is pleased to offer a giveaway copy of Fossil to one winner (U.S. addresses only). All you need to do is leave a comment on this post (with a legitimate e-mail address so we can contact you if you win) by December 6, 2013 at 11:59 P.M. PST. Entrants will be numbered in the order received and then selected at random. Note:  to increase your chances of winning be sure to visit some of the other participants in the blog tour, because most are also offering giveaways. Check the blog tour links listed below for details. Edit: The giveaway has now ended and the winner has been notified. Thanks to everyone who participated.

Fossil is so stimulating, it is sure to raise questions. Here are some links for related information and activities:

1. Ferns

Ferns are a group of plants that have been found as fossils, but also can be found in forests today.

leaf-fossil

They are vascular plants, which means they have the internal channels that move water and nutrients (xylem and phloem). Ferns differ from other vascular plants because they reproduce by spores. More about ferns at Mosses, ferns, liverworts and horsetails at Growing with Science.

2. Dragonflies

dragonfly-on-redbird

These insects with large eyes and wings that stick straight out have also been found in fossils. Some of the relatives of dragonflies were larger that those found today, with wingspans over two feet wide! The adults feed on insects they catch in the air, especially pesky mosquitoes.The immature forms or nymphs live in the water.

See Dragonflies and damselflies at Growing with Science.

3. Pteranodon

One of the fun things about the book, is that kids can call the large winged reptile whatever they feel comfortable calling it. The generic name for it is pterosaur, which means “flying lizard.”

Some people have called all these flying creatures with leathery wings “pterodactyls.” Technically the genus Pterodactylus consists of only smaller pterosaurs with teeth, so you won’t catch experts calling them that.

The larger pterosaurs that lack teeth and have large crests belong to the genus Pteranodon. The creature in the book is a Pteranodon.

If you are local, it turns out there’s an exhibit of pterosaurs  called Rulers of the Prehistoric Skies at the Arizona Museum of Natural History right now. Even if you aren’t local, you can download a free educator’s guide – see “Rulers of the Prehistoric Skies” under “Current Exhibit.”

Related fossil activities at Growing With Science:

Links to free guides to accompany the book at Amazon :

Fossil by Bill Thomson is sure to charge up the reader’s imagination. See where it leads your children today!

Age Range: 3 – 7 years
Publisher: Two Lions (November 5, 2013)
ISBN-10: 1477847006
ISBN-13: 978-1477847008

See a short review of Bill’s previous book, Chalk, at our sister blog, Wrapped in Foil.

Previous stops on the blog tour:

Disclosures: This book was provided for review purposes. Also, I am an affiliate for Amazon, and if you click through the linked titles or ads and make a purchase, I will receive a small commission at no extra charge to you. Proceeds will be used to maintain this self-hosted blog.

 

Come visit the STEM Friday blog each week to find more great Science, Technology, Engineering and Math books.

Bug of the Week: Grasshopper Hide and Seek

Grasshoppers are masters at camouflage.

hidden-hopper

For example, can you find the grasshopper in this photograph?

I would say the antennae give it away.

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Here’s a better view of who you are looking for.

This is a pallid-winged grasshopper. There were quite a few in my yard on October 26 when I took this photograph, and there still is. When I looked in the Bug of the Week archives, I noticed I have a post about pallid-winged grasshoppers from October 26, 2011. I guess I’ll look for them again about that time next year.

Are grasshoppers still active where you live?

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