Trees on the Yale Nature Walk

Image of Q. dentata in the winter, leaves attached.

Korean Oak
Quercus dentata
Tree ID: 79
Marsh and Farnam Gardens
Date of tree entry: February 6, 2018
Observational details: The Korean oak was found amidst a construction site with a torn branch. It stood surveying the area as the last tree standing. Biological background: Quercus dentata is also known as the Korean oak, daimyo oak, or the Japanese emperor oak. The Korean oak is a deciduous tree, meaning it loses its leaves once a year. It is also an angiosperm, or a flowering plant, and it is a eudicot. This can be observed macroscopically from the venation of the leaves, and would also be apparent from the anatomy of the seed and the organization of vascular tissue within the tree. This specimen is 7.5 meters, or approximately 24 feet tall, and the species can grow to up to 20-25 meters. The Korean oak also has remarkably large leaves for its size, growing up to 40cm long and 30cm wide. Typically, the Korean oak flowers in May, with mature acorns appearing between September and October. Geographic distribution: Quercus dentata is originally native to East Asia, specifically Japan, China, and the Korean peninsula. It was introduced to the West in the nineteenth century. In the year 1830 it was transported to the British Isles, where it was occasionally cultivated in botanical gardens much like Yale's own Marsh Botanical Gardens. The acorns of the daimyo oak have been used in Korean cuisine since the time of the Three Kingdoms (57 B.C.E. to 668 C.E.).

Fuji Apple
Malus domestica
Tree ID: 89
Marsh and Farnam Gardens
Date of tree entry: February 6, 2018
small, deciduous tree

Southern (or Bull Bay) Magnolia
Magnolia grandiflora
Tree ID: 78
Marsh and Farnam Gardens
Date of tree entry: February 6, 2018
Hello! We're glad you've come to meet a good friend of ours, Magnolia grandifloria, "the Southern Magnolia", or as we have affectionately named her, Maggie Magnolia. Of course "her" is a misnomer since Maggie has perfect flowers, but read our section on reporductive structures for more about that. While most famous for growing in the southern portion of the United States, Magnolia grandiflora can actually grow as far north as Maine and Washington. It has broad leaves and is an evergreen, meaning it does not lose its leaves in winter. For this reason, and for its beautiful flowers, it is used as an ornamental tree. Magnolia grandiflora is the offical state tree of Mississippi and its flowers are the official state flower of Louisiana. Maggie is the (un-)official pride and joy of the Marsh Botanical Gardens. They are large and can grow to about 60-80 ft tall, but this depends on the habitat and some stay fairly small. Other names you may have heard this tree called by are Bull Bay, Evergreen magnolia, or Great Laurel magnolia. Look for creamy white flowers with a rich fragrance, broad, leathery leaves that are dark green on top and brown on bottom, and an overall oval or pyramidal shape. Enjoy your visit with Maggie!

Pig-nut hickory
Carya glabra
Tree ID: 80
Marsh and Farnam Gardens
Date of tree entry: February 6, 2018
Pignut hickory (Carya glabra) is a common but not abundant species in the oak-hickory forest association in Eastern United States. Other common names are pignut, sweet pignut, coast pignut hickory, smoothbark hickory, swamp hickory, and broom hickory. The pear-shaped nut ripens in September and October and is an important part of the diet of many wild animals. The wood is used for a variety of products, including fuel for home heating. A North American native, Pignut Hickory is usually seen at 50 to 65 feet in height with a 30 to 40- foot-spread but is capable of slowly reaching 120 feet in the forest. The deciduous, 6 to 12-inch- long leaves create a coarse, oval canopy, and the strong but irregularly-spaced branches resist breakage in storms, making it useful as a shade tree.
Black locust tree at Marsh Botanical Garden

Black Locust
Robinia pseudoacacia
Tree ID: 81
Marsh and Farnam Gardens
Date of tree entry: February 6, 2018
The black locust is native to United States, although it has been planted all over North America, Europe, Asia, and South Africa. The species, Robinia pseudoacacia, is a deciduous angiosperm that is considered by many to be an invasive species. The wood of the black locust is very durable and used for many human purposes. Historically, Native Americans used the wood to make bows and tools. The flowers of the tree are strongly fragrant and pleasing to look at, although they often only appear for 7-10 days between May and early June.

Himalayan Pine
Pinus wallichiana
Tree ID: 77
Marsh and Farnam Gardens
Date of tree entry: April 23, 2017
The Himalayan Pine is a beautiful tree native to the Himalayas, Karakoram, and Hindu Kush mountains. It is a coniferous evergreen that grows in altitudes of ~2000-4000 meters. The tree can grow up to 50 meters in height, but is more often 10 to 30 meters tall. It grows quickly and can thrive in moist environments. The branches of the pine can extend outward very far and are covered in blue-green needles all year. It is also known as the Blue Pine, the Bhutan Pine, and the Himalayan White Pine. This particular pine is in a wonderful location right on the corner of Hillside and Prospect, and is in a great place to take a walk or relax and enjoy nature.

Catalpa
Catalpa bignonioides
Tree ID: 74
Marsh and Farnam Gardens
Date of tree entry: April 23, 2017
This tree, also known as “cigar tree” for it’s cigar-shaped, cylindrical seed pods, is located up Prospect Street behind the Marsh Botanical Garden. It is most commonly called the Southern catalpa, since it it is native to a small group of southern states. This medium-sized, deciduous tree typically grows to about 9-18 meters tall (depending on whether it is a small or medium tree) and 1 m in diameter. It also has an irregular, broad-rounded crown. Due to its production of clusters of showy white flowers with purple and yellow markings, it is often planted as an ornamental shade tree. The tree has uses beyond this, also used for general construction work, pharmaceutical purposes, and conservation.

Pawpaw
Asimina triloba
Tree ID: 76
Marsh and Farnam Gardens
Date of tree entry: February 23, 2017
The Pawpaw, otherwise known as the Asimina triloba, is a small tree that bears the largest edible fruit in its native United States. Located close to Hillside Place, the Pawpaw stands (somewhat) tall in the Marsh Botanical Gardens. The Papaw is deciduous and growns as far south as northern Florida, as far north as southern Ontario, Canada, and as far west as Nebraska and Texas. The leaves of the tree grow at the ends of the branches, it grows perfect flowers with six petals, produced in early spring. The fruit of the tree, perhaps its most intriguing aspect, ripen in around September and stay ripe until winter, when it begins to soften and ferment. Sometimes called the "poor man's banana," the Pawpaw fruit has a blend of tropical flavors, including bananas, pineapples, and mangoes and has a custard-like consistency. The fruit is remarkably unsusceptible to insects and disease in comparison to other cultivated fruits, which has made the Pawpaw of interest to organic farmers as it lacks the need of pesticides.

Amur Cork
Phellodendron amurense
Tree ID: 75
Marsh and Farnam Gardens
Date of tree entry: February 9, 2017
The Amur Cork Tree, named for its corky inner bark, is an interesting specimen. The Ainu people in Japan used parts of this tree, which they call shikerebe-ni, as a painkiller. It is also a widely-used source of huàng bà, an important herb used in traditional Chinese medicine. However, in the United States, it crowds out native species, diminishes other trees’ access to light with its shelf-like branching, produces many seeds, and does not have many seed predators. Consequently, this tree is able to successfully outcompete native trees (e.g. oaks, hickories) and shrubs; it also suppresses the growth of canopy trees. Consequently, it has become invasive in parts of New York, Pennsylvania, Illinois, and Virginia. In fact, in Massachusetts, it is considered a "noxious weed."

Red Maple
Acer rubrum
Tree ID: 63
Prospect and Sachem
Date of tree entry: April 17, 2017
This tree is located in the residential neighborhood bordering Prospect St, and close to the vegetation in Marsh Botanical Gardens. The red maple is one of the most common and widespread deciduous trees in Eastern and Central North America. It is super adaptable and has taken on a large variety of morphological characteristics based on its local environment. Many of its features, especially its leaves, are quite variable in form. At maturity it often attains a height of around 15-25 m (50-85 ft). Its flowers, petioles, twigs and seeds are all red to varying degrees. Among these features, however, it is best known for its brilliant deep scarlet foliage in autumn.

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