This is a blog about the native conifers of the Pacific Northwest. It is a companion to the Northwest Conifers site. The blog will focus on timely and interesting details about our conifers, their connections to the rest of the environment, and our connection to them.

Sunday, March 12, 2017

On Conifer Names


Botanical names seem to have a special status in our language. When we know the name of a tree, we often feel like we have gained a special knowledge of that tree. Many names describe the tree or tell you where it grows. Some tell who discovered it. So learning the name of a conifer often does tell you something about that species. More importantly, learning the names forces you to look more closely at the different characteristics of each tree so you can distinguish it from other similar ones. Learning the names of the conifers is not the be all and end all of knowledge, but it marks the beginning of a relationship. It allows you to become acquainted. Deeper knowledge comes later when you can take the time to observe more carefully and completely.

Most conifers have two types of names: A common name and the scientific name. A good place to start is with the common names.

Common names
Douglas fir - Pseudotsuga menziesii 

Like many other plants, conifers have names that are determined by common usage. Sometimes a conifer will have several common names used in different regions. Learning the common name is an easy way to identify a tree. The names are familiar and easy to remember. However, common names can be misleading. For example, none of the native Oregon cedars are true cedars. Cedars are native to the Middle East and the Himalayas. They are in the pine family and appear to be cousins of the firs. When Europeans came to North America, they encountered trees in the cypress family that had wood like the wood of the Old World cedars. So they naturally called them cedars. Many conifers get their common name because of the nature of their wood. It's not so surprising that people would name things based on the use they make of them.

Many trees called pines are not really pines at all. In the nineteenth century, English botanists circled the globe looking for new conifer species. They often called anything with needles on it a pine. Even Douglas fir was called a pine at one time. The Norfolk Island pine you find in stores each December is not even in the pine family. And the rare Japanese umbrella pine isn't in the pine family either. The Norfolk Island pine is in the Araucaria family in the same genus as the monkey puzzle tree. The Japanese umbrella pine is the only species in a family of its own.

Western hemlock - Tsuga heterophylla
Some writers have attempted to mitigate the misleading nature of common names by writing them differently, for example, "western redcedar," "Douglas-fir," and "Port-Orford-cedar."  But these strained artifacts don't really mitigate the confusion. The spoken name sounds the same. Even the written names don't convey the intended information. Any normal person seeing "redcedar" in print would still think that it's a cedar. And the names still don't tell you what genus or family the trees belong to. We should just realize that common names are not scientific names. In fact, one reason we have scientific names is to clear up this kind of confusion. If we want to use a name that correctly identifies the scientific classification of a tree, we will have to learn the scientific name.

Scientific names

Each conifer species also has a scientific name. Why learn the scientific name? These names give you an unambiguous way to identify a species. These names are assigned and agreed to by botanists based on rigorous classification of each plant. Each species is assigned to a general grouping or genus and given a unique species name. The names are Latin or at least given a Latin ending. The name for a species written as Genus species, written in italics with the genus name capitalized. For example, the scientific name of grand fir is Abies grandis. This name is universal throughout the world, no matter what language is spoken.

Grand fir - Abies grandis
As a practical matter, knowing the scientific name usually tells you something about the tree. For example, the name of western hemlock is Tsuga heterophylla. Tsuga is Japanese for hemlock. And heterophylla means variable leaves, which aptly describes western hemlock needles. Also, if you want to learn more about a tree, it helps to know the scientific name. Much of the scientific literature references species by the scientific name. Familiarity with these names will help when you see them in scientific writings.

Western red cedar - Thuja plicata
Even though scientific names give us a more precise way to identify each species, that's not to say that there's no confusion with these names. They may change. Science is not static. As botanists learn more about a tree, they may change its classification to a different genus. These changes generally generate a lot of discussion among the experts and confusion for the rest of us. Such a discussion has been raging about the classification of Alaska cedar. It was in the genus Chamaecyparis, the same genus as Port Orford cedar. Recently someone proposed putting it in a new genus called Xanthocyparis. Others have countered, saying it should be classified as Callitropsis or Cupressus. And some are proposing that all the Cupressus that are native to the New World should be placed in a separate genus called Hesperocyparis. Many other names have changed over time. Botanists had a terrible time classifying Douglas fir. Its name changed 21 times before they finally settled on Pseudotsuga menziesii.

Note that scientific names can also be misleading. For example, the scientific name of incense cedar is Calocedrus decurrens. The genus name means "beautiful cedar." Even the scientific name suggests that the species is closely related to the genus Cedrus, which it is not.

Getting Started

The photos above show the common conifers found at low elevations (below 2000 feet) in northwest Oregon. Look for these when hiking in Portland's Forest Park and other nature parks nearby.

Take some time to learn the names of our native conifers. It will help you become acquainted with them. Given some time and attention, you may even become friends with some of them.

For more help identifying our native conifers, go to Northwest Conifers.