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

OLEACEAE

OLIVE FAMILY

Dieter H. Wilken

Shrub, tree, or vine, some dioecious
Leaves alternate or opposite, deciduous or evergreen, simple to pinnately compound
Inflorescence various; flower sometimes solitary
Flower sometimes unisexual, generally radial; calyx generally minute, tube cup-shaped, lobes 4–15; petals (0)4–6, generally fused; stamens generally 2, epipetalous; pistil 1, ovary superior, chambers 2, placentas axile, ovules 2–4 per chamber, style 1, stigma generally 2-lobed
Fruit: drupe, capsule, or winged achene
Seed 1 per chamber
Genera in family: ± 25 genera, 900 species: ± worldwide; some cultivated for ornamental (Forsythia ; Jasminum , jasmine; Ligustrum , privet; Syringa , lilac) or food (Olea )
Reference: [Wilson & Wood 1959 J Arnold Arbor 40:369–384]

FRAXINUS

ASH

Shrub or tree, generally dioecious
Stem: bark smooth to furrowed, generally gray; twigs generally puberulent, becoming glabrous
Leaves opposite, deciduous, odd-pinnate, petioled, generally thin, generally glabrous; leaflet dark green above, pale below, generally glabrous, base and tip rounded to acute
Inflorescence: clusters or panicles, axillary, often peduncled; flowers pedicelled
Flower: calyx 1–2 mm, shallowly ± 4-lobed; petals 0, 2, or 4, free or fused
Staminate flower: stamens generally 2; pistil vestigial
Pistillate flower: stamens 0; ovules 2 per chamber
Fruit: achene, winged
Seed generally 1
Species in genus: ± 65 species: temp North America, Eurasia, tropical Asia
Etymology: (Latin: ancient name)
Reference: [Little 1952 J WA Acad Sci 42:369–380]

Native

F. latifolia Benth.

OREGON ASH

Tree < 25 m, dioecious
Stem: twigs cylindric
Leaf 12–33 cm; petiole glabrous to puberulent; leaflets 5–7, 2–10 cm, widely elliptic to narrowly ovate, entire to ± serrate, sparsely puberulent below, sessile (or lower very short-petioled)
Flower: petals 0
Fruit 28–50 mm, 5–8 mm wide; body subcylindric, winged from ± lower 3/4
Chromosomes: 2n=46
Ecology: Canyons, streambanks, woodland
Elevation: < 1700 m.
Bioregional distribution: Northwestern California, Cascade Range, Sierra Nevada, Great Central Valley, San Francisco Bay Area, Modoc Plateau
Distribution outside California: to British Columbia
Horticultural information: 4, 5, 6 &IRR: 1, 2, 3, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24.

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