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Chrysolepis is a small genus of plants in the family Fagaceae, endemic to the western United States. Its two species have the common name chinquapin. The genus occurs from western Washington south to the Transverse Ranges in Southern California, and east into Nevada.
The fruit is a densely spiny cupule containing 1–3 sweet, edible nuts, eaten by the indigenous peoples. The fruit also provides food for chipmunks and squirrels.
Chrysolepis is related to the subtropical southeast genus Castanopsis (in which it was formerly included), but differs in the nuts being triangular and fully enclosed in a sectioned cupule, and in having bisexual . Chrysolepis also differs from another allied genus chestnut (chestnuts), in nuts that take 14–16 months to mature (3–5 months in Castanea), evergreen leaves and the shoots having a terminal bud.
Species
There are two species of Chrysolepis — Chrysolepis chrysophylla and Chrysolepis sempervirens — which like many species in the related genera of Castanopsis and Castanea are called chinquapin, also spelled "chinkapin".
Chrysolepis chrysophylla golden chinquapin or giant chinquapin A tree reaching tall, or sometimes a shrub tall. Chrysolepis chrysophylla grows at lower elevations than C. sempervirens, from sea level to , rarely . The leaves are long, with an acute (sharp-pointed) apex. The bark is thick and rough. It occurs in coastal areas of the Pacific Coast Ranges from Washington near Seattle south to the San Luis Obispo area California Coast Ranges. There is also a small disjunct population distribution in the northern Sierra Nevada east of the Sacramento Valley Chrysolepis sempervirens bush chinquapin A shrub only tall. Chrysolepis sempervirens grows mostly at high elevation, altitude. The leaves are smaller, long, with an obtuse (blunt-pointed or rounded) apex. The bark is thin and smooth. It occurs in interior southwest Oregon and California, in the Klamath Mountains, the full Sierra Nevada range, and the San Gabriel, San Bernardino, and San Jacinto Mountains of the Southern California Transverse Ranges.
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