This page is based on the 1993 Jepson Manual.
Please see the Jepson eFlora for up-to-date information about California vascular plants.
|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL||
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
Print edition is available from the University of California Press
|The second edition of The Jepson Manual (2012) is available from the University of California Press|
|See also the Jepson eFlora, which parallels the Second Edition|
Tree, shrub, monoecious
Stem: trunk < 35 m; bark ± smooth; lenticels present
Leaves simple, alternate, petioled, deciduous; stipules deciduous; blade ovate to elliptic, generally serrate, ± doubly so
Inflorescence: catkin, generally appearing before leaves, often clustered; bracts each subtending 23 flowers and 36 bractlets
Staminate inflorescence pendent, ± elongate
Pistillate inflorescence pendent or erect, developing variously in fruit (see key to genera)
Staminate flower: sepals 04, minute; petals 0; stamens 110; pistil vestigial or 0
Pistillate flower: sepals 04; petals 0; stamens 0; pistil 1, ovary inferior, chambers 2, each 1-ovuled, stigmas 2
Fruit: nut or nutlet, sometimes winged, subtended or enclosed by 12 bracts
Genera in family: 6 genera, 105 species: generally n hemisphere; some cultivated.
Shrub, small tree
Stem: trunk < 6 m; bark smooth or scaly, dark brown; twigs glandular-hairy, becoming glabrous, brown; lenticels small; winter buds ciliate
Leaf hairy; blade 410 cm, oblong to ovate, base obliquely cordate
Staminate inflorescence 47 cm; bracts each subtending 3 flowers and 3 bractlets
Pistillate inflorescence < 1 cm, appearing as terminal bud; bracts each subtending 2 flowers and 6 bractlets
Staminate flower: sepals 0; stamens 4
Pistillate flower: sepals 4; stigmas showy, red
Fruit 23 cm, not winged, 12 per catkin, each enclosed in a papery involucre of 2 fused bracts
Species in genus: 15 species: n hemisphere
Etymology: (Latin: hazelnut, filbert)
Flexible stems used in basket-making; some cultivated as food crop.
Stem: trunks < 4 m
Leaf: petiole 510 mm; blade ± velvety-hairy, base cordate, tip acute to acuminate
Fruit: involucre vase-shaped
Ecology: Common. Many habitats, especially moist, shady places
Elevation: < 2100 m.
Bioregional distribution: Northwestern California, Cascade Range, Sierra Nevada, San Francisco Bay Area
Distribution outside California: to British Columbia
Horticultural information: 4, 5, 6, 17 IRR: 7, 15, 16, 23, 24 &SHD: 1, 2, 3, 8, 14, 18, 19, 20; STBL; edible nuts.
|YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).|