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|
Shrub, tree, generally dioecious (rarely monoecious)
Stem: trunk < 40 m; wood soft; bark smooth, bitter; buds scaly
Leaves simple, alternate, deciduous; stipules generally deciduous, often large
Inflorescence: catkin, generally appearing before leaves; each flower subtended by disk or 12 nectary glands and 1 bract
Flower: perianth 0
Staminate flower: stamens 1many
Pistillate flower: pistil 1, ovary superior, chamber 1, stigma lobes 24
Seeds many; hairs fine, white, cottony
Fruit: capsule; valves 24
Genera in family: 2 genera, 340 species: generally temp (except Australia, Malay Archipelago) moist places; many cultivated. Hybridization common; identification often difficult. Family description, key to genera by John O. Sawyer, Jr.
Stem: trunk < 40 m; young bark smooth, pale yellow-green to gray; older bark furrowed, brown to gray; twigs with swellings below leaf scars; winter bud generally resinous, scales > 3
Leaves generally glabrous (juvenile leaves may differ from adult leaves); blade 311 cm, elliptic to triangular, veins pinnate or subpalmate, tip generally elongate
Inflorescence: catkin pendent, 38 cm; bract cut into narrow segments; flowers sessile, on a cup- or saucer-like disk
Staminate flower: stamens 860
Pistillate flower: style short, stigmas 23(4), large, scalloped to 2-lobed
Fruit spheric to conic; valves 23(4), 312 mm
Species in genus: 40 species: n hemisphere
Etymology: (Latin: name for plants of this genus)
Stem: crown wide; trunk < 20 m; twigs and winter buds white-tomentose
Leaf: petiole 1/31/2 blade length; blade 39 cm, 35-lobed, base rounded to slightly cordate, tip acute, margin entire to toothed, upper surface blue-green, glossy, lower white-tomentose
Ecology: Disturbed places near settlements
Elevation: 6001800 m.
Bioregional distribution: Klamath Ranges, Cascade Range, Great Basin Floristic Province, expected elsewhere
Distribution outside California: native to c Europe, c Asia
Persisting primarily by clonal root-sprouting.
|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).|