Classification of Christmas Trees & Other Conifers

Most land plants are vascular plants. These plants have specialized structures such as roots, stems, branches, and leaves. The vast majority of familiar trees, including Christmas trees, belong to this group.

Most vascular plants reproduce through seeds, but ferns are an important exception. Ferns reproduce through spores rather than seeds, placing them on a different evolutionary branch from seed-bearing plants.

Seed-bearing plants divide into angiosperms and gymnosperms. Angiosperms produce flowers and develop seeds enclosed within fruits. Gymnosperms produce exposed or “naked” seeds, without true flowers or fruits.

Conifers make up most gymnosperms. Their defining reproductive structures are cones, which contain or support their seeds. Most traditional Christmas trees belong to this group.

Cycads and ginkgo trees are gymnosperms but not conifers. Cycads grow mainly in tropical regions, while the ginkgo is recognizable by its distinctive fan-shaped leaves, which turn color and fall during autumn.

Conifers belong to the class Pinopsida, which the chart divides into three major orders. Pinales contains pine-like trees, Cupressales contains cypress-like trees, and Araucariales includes unusual species such as the monkey puzzle tree.

Monkey puzzle trees are sometimes used as outdoor Christmas trees. They belong to Araucariales and have exceptionally stiff, sharp leaves, making them unsuitable for bringing indoors. Their common name reportedly originated from a remark that climbing one would puzzle a monkey.

The pine family includes several different types of Christmas trees. Pines, spruces, and true firs all belong to the family Pinaceae within the order Pinales, despite having visibly different needles and cones.

Pine trees can be identified by needles growing in bundles. Unlike spruces and firs, pines generally produce long needles grouped in clusters of two or more rather than individually attached needles.

Scotch pine is a common Christmas tree with needles arranged in pairs. Each pair emerges from a small sheath, providing a reliable identification feature when examining the branches closely.

Spruce trees have short, sharp needles with a roughly square cross-section. Their needles grow individually and can usually be rolled between the fingers because they are not flat. The pointed tips also make spruce branches noticeably pricklier than fir branches.

True fir trees have relatively soft, flat needles. Their needles generally grow individually, feel less sharp than spruce needles, and cannot be rolled between the fingers as easily. Touching and examining the needles is therefore a practical way to distinguish firs from spruces.

The indoor Christmas tree tradition began in Germany approximately 400 years ago. According to Baker, the Norway spruce was the principal tree used when the custom first developed.

Norway spruce was historically the traditional Christmas tree, but firs have become more popular. Their softer needles make them more comfortable to handle and decorate than the sharper needles of spruce trees.

Fraser fir is presented as one of the most popular Christmas trees in North America. Its popularity reflects the broader preference for softer-needled fir trees over traditional spruces.

Douglas fir is particularly common as a Christmas tree on the West Coast of North America. Despite its name and resemblance to true firs, it belongs to a separate genus and is not classified as a true fir.

Christmas tree sellers often remove cones before selling trees. This makes cone-based identification difficult for someone examining a decorated tree indoors, even though cones can provide some of the clearest distinctions between conifer species.

Douglas fir cones have distinctive protruding bracts resembling a mouse's tail and hind feet. These small extensions project from between the cone scales and provide one of the easiest ways to distinguish Douglas firs from true firs when cones are available.

True fir cones grow upright rather than hanging downward. This separates them from most other familiar conifers, whose cones typically point toward the ground.

Hemlock trees belong to the pine family and resemble true firs. Their needles have small stalk-like attachments connecting them to the branches. Baker recommends remembering the phrase “hems have stems” to distinguish hemlocks from firs.

Hemlocks are not commonly used as Christmas trees. Although their appearance resembles that of fir trees, they are less prominent in the commercial Christmas tree market.

True cedars belong to the pine family. They are relatively rare in North America, and several North American trees commonly called cedars are not members of the true cedar genus.

Larches are conifers that lose their needles each year. Unlike most conifers associated with evergreen foliage, larches change color during autumn and shed their needles before winter, behaving similarly to deciduous broadleaf trees.

The order Cupressales includes yews and members of the cypress family. These trees form another major branch of conifers and differ in several visible characteristics from pines, spruces, and firs.

Yew trees produce distinctive red, berry-like seed structures. These are not true botanical berries. Yews contain poisonous components, particularly their seeds, and their fruits should not be treated as safe to eat.

Yews belong to their own family within Cupressales. Their red, fleshy seed coverings make them recognizable among conifers, which more commonly display woody cones.

Cypress trees generally have flattened, scale-like leaves rather than conventional needles. Their foliage forms overlapping sprays that look different from the separate needles found on pines, spruces, and firs.

Cypress branches are commonly used in Christmas garlands. Although cypress trees are not typical indoor Christmas trees, their evergreen foliage makes them useful for seasonal decorations.

Western red cedar is not a true cedar. Common along the western coast of North America, it resembles a cypress and belongs to the cypress family rather than the pine family containing true cedars.

Western red cedar can be distinguished from similar cypresses by markings underneath its foliage. Baker describes the pale markings on western red cedar as resembling small butterflies, whereas the markings on the cypresses he compares it with resemble thin X- or Y-shaped lines.

Coast redwoods are the tallest living tree species. Found along the Pacific coast of North America, these enormous trees belong to the genus Sequoia within the cypress family.

Hyperion is an exceptionally tall coast redwood discovered in Northern California in 2006. Baker reports its height as approximately 379 feet and identifies it as the tallest known individual tree on Earth.

Junipers can be recognized by their small, blue, berry-like cones. Although these structures resemble berries, they are botanically modified cones rather than true fruits.

Common juniper produces berry-like cones that can be consumed in small quantities. They are commonly dried and crushed for flavoring and are especially associated with the production of gin. This does not mean the berries of every juniper species are edible.

Mistletoe is associated with Christmas but is not a conifer. It belongs to the sandalwood family and grows as a parasitic plant on other trees, obtaining water and nutrients from its host.

Mistletoe becomes particularly noticeable during winter because it remains evergreen. When a deciduous host tree loses its leaves, the mistletoe growing among its branches becomes much easier to see.

Holly is another traditional Christmas plant unrelated to conifers. It is recognizable by its glossy, often spiny evergreen leaves and bright red berries. Baker places it within the asterid branch of flowering plants.

Poinsettias belong to the rosid branch of flowering plants. Their prominent red leaves make them one of the most recognizable Christmas decorations, but they are evolutionarily distinct from both conifers and holly.

Christmas plants come from several different evolutionary branches rather than one closely related group. Pines, spruces, firs, cedars, yews, cypresses, redwoods, and junipers are gymnosperms, while mistletoe, holly, and poinsettias are flowering plants. Their association with Christmas reflects seasonal appearance and decorative traditions rather than close botanical relationships.

Needle arrangement, needle shape, leaf markings, and cone structure are the principal identification tools for common Christmas trees. Bundled needles indicate pines; sharp, square needles suggest spruces; soft, flat needles suggest firs; distinctive protruding cone bracts identify Douglas firs; and flattened, scale-like foliage points toward members of the cypress family.