Red Oak

Quercus rubra

There is only one red oak in the Park, in the southeast triangle, easily identified by its leaves and acorns. See Wikipedia entry here
Slender red oak in southeast triangle
Red oak factoids:
  • Sometimes called the "northern" red oak to distinguish it from the southern red oak, also known as the Spanish oak
  • Called the "red" oak because of the fall color and also due to the hint of red in the leaf veins on the underside of the leaves.
  • Its acorns are a food for squirrels, and if the acorns are chopped up and leached in water to remove the bitter tannins, can be consumed by humans.
  • Unlike white oaks, the acorns of which mature in one season, the acorns of red oaks take two seasons on the tree to mature. For this reason the acorns are higher in bitter tannins.
  • Red oak acorns have tiny hairs on the inner surface of their acorn caps, whereas white oak acorns are hairless.
  • Trees that shed their leaves in the fall are called deciduous trees.Oaks are deciduous,  but the dead oak leaves often stay on the tree through the winter until new leaf buds form in the spring.
Red oak leaves are more pointed at the tips than other oaks
Botany 101 Bonus
Trees are not mobile. They cannot walk away from insect pests or competing plants. For this reason they often contain within their roots, stems, and leaves chemicals that are distasteful or toxic to insects. Some trees also contain chemicals that inhibit the growth of surrounding plants. These plants that inhibit the growth of other plants via chemicals are termed allelopathic. 
The exemplar of a strongly allelopathic plant is the black walnut tree, under which almost nothing will grow. You wouldn't want to plant shade-loving plants or even grass under a black walnut. There are many exceptions in biology, and even near the strongly allelopathic black walnut, some species, like our Park's honey locusts, can grow. There is a constant arms race over evolutionary time between plant defenses and other plants' counter-strategies.
The red oak is moderately allelopathic, with the allelopathic chemicals contained in roots, stems, and leaves. 

Matthias Baldwin Park 

423 N 19th St 

Philadelphia, PA 19130

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