Very cool!

tj

Citrus is another example!

Do shrubs like roses with green stems also photosynthesize?

There are several trees that have this capability, but Rosa I don’t knowsa. Okay, that was bad. They seem to have green and/or thin bark. What I find odd is the only conifer being Lacebark Pine.

You knowsa, it might be trading some food-producing leaf area for more water conserving but still food-producing bark. Cactus are pretty much all bark/stem photosynthesizing.

Fabaceae (pea family).

That yellow green bark is beautiful! We have a couple desert Museum Palo Verde because they are thornless and the flower production in the spring is amazing. Here’s ours shading chicken pen.

Green Bark - Arnold Arboretum https://share.google/DDbtyydQbq3Zqn4Rt

Seems that many thin barked trees, not just green barked, can photosynthesize. One I see in bloom at this time of year is Acacia dealbata. Very green bark. Also Fabaceae.

Kinda reminds me of caragana

While a number of thin barked trees can photosynthesize via bark, it is not essential to their continued well-being. Those - like palo verde - that are considered evergreen but lose their foliage for an extended period due to climatic stress do rely on it to adapt and thrive. It is not surprising that few conifers react in this manner as they are seldom exposed to that kind of stress and prolonged defoliation.

The OP picture brought to mind my honey locust (Gleditsia triacanthos).

Not sure which picture people are referring to but they're all Fabaceae

Greenish photosynthetic bark is apparently not uncommon in the Fabaceae - some hardy examples would include Caragana (mentioned by L Clark above), as well as Laburnum, Sophora, and Maackia.

A non-Fabaceae example in my own yard is Sassafras.

Once I stated looking at it, it's amazing the number of different trees that can photosynthesize, at least partially, through their bark and branches.

Apparently, even sugar maples.

It's easy to see where the yellow paloverde, in a long dry season area, would need some way to produce food for itself, when the leaves are absent or extremely degraded from drought.