Guardian Nature School Team Contact Blog Project Noah Facebook Project Noah Twitter

A global community of nature enthusiasts
photographing and learning about wildlife

Join Project Noah!
nature school apple icon

Project Noah Nature School visit nature school



The acorn, or oak nut, is the nut of the oaks and their close relatives (genera Quercus and Lithocarpus, in the family Fagaceae). It usually contains a single seed (rarely two seeds), enclosed in a tough, leathery shell, and borne in a cup-shaped cupule. Acorns vary from 1–6 cm long and 0.8–4 cm broad. Acorns take between about 6 and 24 months (depending on the species) to mature; see List of Quercus species for details of oak classification, in which acorn morphology and phenology are important factors.


This picture was taken on my backyard, in Northern Virginia.

Species ID Suggestions

Sign in to suggest organism ID

No Comments

Spotted by

McLean, Fairfax County, USA

Spotted on Jun 1, 2012
Submitted on Nov 1, 2012

Related Spottings

Acorn Acorn acorn Giant acorn

Nearby Spottings

Great Blue Heron American Bittersweet Chinquapin Oak oak galls


Noah Guardians
Noah Sponsors
join Project Noah Team

Join the Project Noah Team