Senna plant seedpods

Shown here is a seedpod cluster of a plant called senna, of which there are more than 250 varieties. Most are native to tropical regions of the world, and some are found in the northern temperate zone in which Missouri lies. In Sudan, senna leaves are dried and eaten. In China, an extract of the senna seed is used in food preparation. In Nigeria, the plant is used to treat skin infections.

The United States Department of Agriculture lists at least one kind of senna as being native to Missouri. Many kinds of senna have been introduced into regions of the world where they have become invasive. Because of this, it is difficult to make positive identification. Most senna plants have yellow flowers that are shaped like a pea blossom. Some species of senna grow into trees, and some grow no more than about a foot tall. The one I've photographed here was about six feet tall.

Through the Woods is a weekly nature photo column by Aaron Horrell. Find this column at semissourian.com to order a reprint of the photo. Find more work by him at the Painted Wren Gallery.