Leaves – Page 3 – a curious nature

Intermission: Meet an Odd Member of the Rose Family …. The Desert (Eastern) Mountain Mahogany

February 8, 2023

The Desert (Eastern) Mountain Mahogany is a very branchy shrub commonly found in the mid-elevation foothills of the Sandia, Manzanita, and Manzano Mountains east of the Rio Grande River in central New Mexico. This species’ formal and very appropriate name, Cercocarpus breviflorus variety breviflorus, comes from both Greek (kerkos: tail; karpos: fruit) and Latin (brevi: short; florus: flowered). As a matter of fact, the 9 species of the genus Cercocarpus all have long feathery tails that twist and turn from the tip of a single fruit, called an achene (like a sunflower seed).

So why is this species odd?

Well, the fruit, for one reason. Most of the thousands of rose family members have fruits called a hip (rose), pome (apple), drupe (prune), or aggregate (strawberry). And even though the strawberry is composed of numerous miniature achenes, it’s the single achene found in the mountain mahoganies that’s unusual to the family.

To further emphasize the oddness of the Cercocarpus genera, all of its 9 species has a symbiotic relationship with a bacteria called Frankia. And that’s an unusual characteristic of the rose family, which moved Cercocarpus and 4 other genera into the subfamily Dryadoideae. That’s all a bit technical when it comes to plant classification, and kind of skips the real reason why the Frankia bacteria is important to the survival of Desert Mountain Mahogany. Nitrogen Fixation!

Read on to learn more …..

Have you rescued a leaf today?

It’s always a grand idea to save leaves raked up in the Fall into big piles scattered about your yard. These cast leaves provide important habitat for overwintering birds, small mammals and insects. In the Spring they break down forming compost which helps recharge the soil with nutrients and microbes that fertilize new seedlings and build soil structure.

But what about that lone leaf, now brown and crunchy, alone on the ground? That leaf, once part of a network of thousands that once beautifully graced a massive shade tree growing bravely alongside a busy city street? That leaf, now fallen to a surface covered in concrete or pavement, is skittering about in the late morning breeze searching fruitlessly for an organic resting place.

After leaving our favorite Albuquerque Mexican restaurant the other day, I stepped into the parking lot and noticed a giant sycamore leaf scratching and skidding across the pavement. Seconds later, an incoming car full of hungry customers about to park, was on a collision course with this abandoned leaf! Yikes! Quickly playing out the scene out in my mind, I dashed across the pavement and scooped up this big brown leaf, rescuing it from being smashed into bits and pieces.

Close up sketch of the upper leaf surface, showing the “skirt” over the petiole.

Whew! That was a close call. Naturally this leaf deserved better treatment and a chance to contribute to Earth’s complex web of resources. And that’s what would happen ……. after a few sketches in my journal, of course.

The rescued sycamore leaf before being placed in a compost pile

This big, brown, crunchy sycamore leaf is now a part of one of the various compost piles we keep scattered about our yard. If leaves could feel, I’d like to think she’s so much happier being rescued than the alternative. Would you agree?

The compost pile topped with the rescued sycamore leaf. Home at last!

Have you rescued a leaf today?

Almost fallen leaves

Our Smoke Tree is always one of the last to drop its leaves. While this tree tenaciously clings to its thousands of food makers, the leaves go through many stages of decay. Some remain purple-green but are polka-dotted with rusty red spots. Some more quickly change to brilliant yellow-orange with rusty splatters. Some display hints of green-brown and it’s these leaves that show the most insect spotting and damage.

One day, probably soon, the tree will get tired of the display, and just before a heavy frost or wet snow, it will stand bare with piles of multi-colored leaves lying on the ground, having dropped in one big fall.

Here’s a page from my perpetual journal that I created yesterday from a few leaves plucked from this pretty Smoke Tree.

Enjoy your seasonal changes wherever you may live!