Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

SALICACEAE

WILLOW FAMILY

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 1–2 nectary glands and 1 bract
Flower: perianth 0
Staminate flower: stamens 1–many
Pistillate flower: pistil 1, ovary superior, chamber 1, stigma lobes 2–4
Seeds many; hairs fine, white, cottony
Fruit: capsule; valves 2–4
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.

SALIX

WILLOW

George W. Argus

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 1–8
Pistillate flower: ovary stalked or sessile, style 1 or 0, stigmas 2, each sometimes 2-lobed; nectaries 1–several, 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 9:1–170; Dorn 1976 Canad J Bot 54:2769–2789]
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

S. jepsonii C.K. Schneid.

JEPSON'S WILLOW

Shrub < 3 m
Stem: twigs brownish, tomentose or silky, becoming glabrous, brittle at base
Leaves: young leaves silky; mature blade 55–103 mm, ± lanceolate, acute (both ends), entire, lower surface glaucous, densely silky, upper surface sparsely so
Inflorescence appearing with leaves, 13–60 mm, on leafy shoots 1.5–7 mm; flower bract tawny or brown
Staminate flower: stamens 2 or 1
Pistillate flower: ovary silky, narrowly ovoid, style 0.4–0.6 mm, stalk 0.4–1.2 mm
Ecology: Margins of lakes and streams, wet meadows
Elevation: 1000–3400 m.
Bioregional distribution: High Cascade Range, High Sierra Nevada
Synonyms: S. sitchensis Bong vars. angustifolia Bebb and ralphiana (Jeps.) Jeps
Like S. sitchensis Bong. but smaller, leaves narrower (variable), stamens 2 vs 1 (variable), and ovary narrower. May be derived from S. drummondiana Hook. X S. sitchensis Bong
Horticultural information: TRY; STBL.

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