|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.
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)
See the CNPS Inventory for information about endangerment and rarity.
Stem: crown slender; trunk < 15 m; twigs glabrous; winter buds very gummy
Leaf: petiole 1/3 blade length, lower side round, upper widely channeled; blade 411 cm, lanceolate, base wedge-shaped, tip acute or tapered, margin finely scalloped, surfaces yellow-green, glabrous
Elevation: 12001800 m.
Bioregional distribution: East of Sierra Nevada
Distribution outside California: to Oregon, Rocky Mtns, n Mexico
[X P. acuminata Rydb. misapplied]
Horticultural information: In cultivation.