TREATMENT FROM THE JEPSON MANUAL (1993) |
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Jepson Interchange (more information) |
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©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora. |
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.
Native |
Shrub < 1 m
Stem: twigs brownish, glabrous or silky
Leaves: stipules 0 or vestigial; young leaves glabrous or white- or white-and-rusty-silky; mature blade 2043 mm, ± elliptic, acute (both ends), entire to finely serrate, glabrous or silky, glossy above, glaucous below
Inflorescence appearing before leaves, 1045 mm, sessile, rarely on leafy shoots < 3 mm; flower bract brown to black
Staminate flower: stamens 2
Pistillate flower: ovary white- or white-and-rusty-silky, style 0.51.4 mm, stalk 0.30.8 mm
Chromosomes: 2n=76, 57
Ecology: Subalpine meadows, riverbanks
Elevation: 25004000 m.
Bioregional distribution: c High Sierra Nevada, East of Sierra Nevada
Distribution outside California: to n&eastern N.America, New Mexico
Flowering time: JunAug
Synonyms: S. phylicifolia L. var. monica (Bebb) Jeps
Horticultural information: TRY.