|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
previous taxon |
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
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.
Shrub, tree, dioecious; bud scale 1, not sticky, margins generally fused (or free, overlapping)
Stem: twigs generally flexible and not glaucous
Leaf: blade linear to widely obovate, entire to toothed, generally ± hairy
Inflorescence: dense catkin emerging before, with, or after leaves, sessile or on a short leafy shoot; bract subtending each flower
Flower: perianth 0
Staminate flower: stamens 18
Pistillate flower: ovary stalked or sessile, style 1 or 0, stigmas 2, each sometimes 2-lobed; nectaries 1several, generally rod-like, generally between inflorescence axis and flower
Fruit: valves 2
Species in genus: ± 400 species: ± worldwide, especially n temp, arctic
Etymology: (Latin: ancient name)
Reference: [Argus 1986 Syst Bot Monog 9:1170; Dorn 1976 Canad J Bot 54:27692789]
Difficult, highly variable. Not all specimens will key easily; sprout shoots and other extreme forms are not included in keys, may require field comparison for identification. Studies of variation, hybridization needed.
Shrub, small tree, < 10 mSee the CNPS Inventory for information about endangerment and rarity.
Stem: twigs spreading widely, red-brown, soft-shaggy-hairy
Leaves: young leaves hairy; mature blade 2080 mm, elliptic to narrowly obovate, abruptly acute (base obtuse to acute), entire to crenate, tomentose or silky on both surfaces, becoming glabrous
Inflorescence appearing with or just before leaves, 660 mm, on leafy shoots 315 mm (± 0 in staminate); flower bract tawny
Staminate flower: stamens 2
Pistillate flower: ovary long-beaked, silky, style 0.10.4 mm, stalk 25 mm
Ecology: Streams, lake shores
Elevation: 12001400 m.
Bioregional distribution: n Modoc Plateau (Lower Klamath Lake, Siskiyou Co.; Goose Lake, Modoc Co.)
Distribution outside California: to Alaska, eastern N.America, New Mexico
Horticultural information: In cultivation.