Daniel Lewis is a tree nerd, and I say that affectionately, from one tree nerd to another. By this, I mean my house is filled with odd pieces of wood collected in forests and on beaches for no reason other than the beauty I see in their gnarled and twisty forms. Lewis, however, is the guy who could probably identify the type of tree these bits of wood come from and then launch into a lecture on the genus of the tree and its prospects for survival on a warming planet.
An environmental historian and college professor who lives in Southern California, Lewis has built his latest book around 12 trees he finds most interesting and important. Disappointingly, although New Hampshire is the second most forested state in the U.S. according to the New Hampshire Division of Forests and Lands, the 12 do not include the sugar maple, Eastern hemlock or any other of the most prevalent trees in New England.
Lewis’s picks are a disparate tribe flung around the planet — in some cases, literally, by seed dispersal. They include the bristlecone pine, the coast redwood, the East Indian sandalwood tree, the African baobab, the blue gum eucalyptus and the olive tree. Each tree gets its own chapter, in which Lewis tells stories about the tree’s history, its uses and abuses by humans, and its outlook. Along the way, he ventures merrily off the beaten path in order to share nuggets of information he has gleaned during his research.
As an example, Lewis wanted to confirm that products of the olive tree, which mainly grows in the Mediterranean and in California, are found on all the continents. So he tracked down the person in charge of supplying food to the largest year-round encampment in the Antarctic, and we subsequently learn how the 150 to 900 people at the McMurdo Station are fed. Food is delivered there just once a year, in January or February, and it sounds like they eat better there than many of us do. “When you’re stuck in a vast, tree-free tract of wind-driven snow and ice, you need good olives and their oil. Green, black, and Kalamata olives are the three varieties usually on hand. Olive oil and olives are also a staple for their pizza station, which bakes up sixteen thousand to eighteen thousand pizzas annually,” Lewis writes.
Due to the popularity of its drupe — that is the new word we learn for pitted fruits like the olive, peach or apricot — the actual olive tree doesn’t get as much attention in its chapter as the other 11 trees, as Lewis delves mainly into the production of olive oil. The demand for olive oil is so great that just 10 percent of harvested olives are consumed as olives; the rest is pressed into oil in a mind-bogglingly complex and regulated process that explains why the product is so expensive.
More focus on the tree itself is given in chapters of two threatened species of trees: the African baobab (you might not recognize the name, but Google it, and you will most likely recognize the tree) and the toromiro tree, once common on a Pacific island.
The African baobab is a source of water to elephants during times of drought, which is interesting, because the baobab, for reasons scientists can’t explain, stores much more water than an individual tree needs for itself. But as tempting as it is to think that the tree is, on some level, being helpful to elephants or other living things with its excess hydration, it is the elephants’ violent assault on the trees to obtain water that is contributing to the trees’ demise.
Equally interesting is the story of what Lewis calls “the nearly lost tree of Rapa Nui.”
Rapa Nui is the Pacific island more commonly known as Easter Island. It was once resplendent with the Sophora toromiro, which doesn’t have a common name or nickname like other trees and is simply known (by the tree nerds who pay attention to it) as the toromiro.
The toromiro is a small flowering tree that was part of a “painful drop in biodiversity” after humans arrived there around the 12th century. In the case of the toromiro, however, its gradual decline wasn’t all human-driven; Lewis explains how other factors were likely at play, including dozens of devastating tsunamis that have hit the island over time. But the trees were harvested too, for firewood and building material. By the 1600s wood was so scarce on the island that it became the most valuable commodity there, Lewis writes. Even driftwood was “precious.”
Today, more than six decades after the last toromiro tree mysteriously disappeared from the island, attempts are being made to re-introduce the tree to the island from toromiros found growing elsewhere, the seeds carried by birds or ocean currents. It’s not as easy as just planting seedlings. The soil composition has changed so much that cultivated trees have not yet taken root.
These are the sorts of stories that make Twelve Trees an unexpectedly fascinating read, although it’s not necessarily the sort of book that you’d recommend, for example, to your Bruins-obsessed neighborhood. It’s a book to be read slowly and thoughtfully, and would appeal most to those who think businesses should close for Arbor Day. (April 26 this year, in case you didn’t know.)
While Twelve Trees has its “Bueller? Bueller?” moments — most notably when Lewis delivers what is best described as a rapturous ode to lichens — it will make you think that maybe you care more about trees than you know. B
