Jepson eFlora: Taxon page
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Fraxinus dipetala

Higher Taxonomy
Family: OleaceaeView DescriptionDichotomous Key

Habit: Perennial herb to tree [vine], hairs 0 or peltate or not; rarely dioecious. Leaf: simple to odd-pinnately compound, alternate or generally opposite, deciduous or evergreen; stipules 0. Inflorescence: various; flowers >= 1. Flower: generally bisexual, generally radial; calyx generally minute (0), tube cup-shaped, lobes 4--15; petals (0)4--6(8), generally fused; nectar disk often present; stamens (0)2(4--5), epipetalous; pistil 1, ovary superior, chambers 2, each 2--4 ovuled, placenta axile, 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, olive).
eFlora Treatment Author: Family description, key to genera by Thomas J. Rosatti; treatment of genera by James Henrickson, except as noted
Scientific Editor: Bruce G. Baldwin.
Genus: FraxinusView DescriptionDichotomous Key

Common Name: ASH
Habit: Shrub or tree; generally dioecious, often bisexual (in California). Stem: older bark smooth or becoming furrowed, generally gray; lenticels broadly elliptic; twigs cylindric to 4-angled, glabrous to hairy; developing short-shoot spurs. Leaf: simple or generally odd-pinnate, opposite, deciduous; petioles channeled, occasionally winged, hairy or not; if compound, leaflets (1)3--9, lanceolate to ovate or obovate, generally acute to acuminate at tip, entire or +- crenate-serrate, generally dark green adaxially, pale abaxially, thin to +- leathery in drier habitats, generally glabrous or with simple hairs abaxially or throughout, proximal opposite on rachis, stalked or not, terminal generally largest, stalk longer. Inflorescence: axillary, of clusters or long-branched panicles; flowers pedicelled. Flower: unisexual or bisexual; calyx 1--2 mm, shallowly +- 4-lobed to cut, persistent on fruit; petals 0, 2, or 4, free or fused to basal filaments. Staminate Flower: stamens 2(3); pistil vestigial. Pistillate Flower: stamens 0; style slender; ovules 2 per chamber. Fruit: achenes, winged, wings generally flat, extending to tip or base of seed-containing chamber. Seed: generally 1.
Species In Genus: +- 65 species: temperate. North America, Eurasia, tropical Asia. Etymology: (Latin: ancient name) Note: Fraxinus uhdei (Wenzig) Lingelsheim, Mexican ash, cultivated in western United States; similar to Fraxinus velutina, with +- larger leaves and leaflets, generally with stiff hairs to 0.5 mm bordering abaxial midvein and occasionally 2° veins abaxially (as occasionally in Fraxinus velutina), and +- larger fruit, but margins tapered to near base of fruit body; native northern Mexico to Honduras.

Fraxinus dipetala Hook. & Arn.
Habit: Shrub to small tree, 1.5--3(6) m. Stem: older stem bark gray, smooth; twigs cylindric to 4-angled, gray; buds +- glandular-puberulent. Leaf: compound, 7--18 cm, 5--9(11) cm wide; petiole 2.4--4.5 cm; leaflets (3)5--7(9), 2--4.5 cm, 1--2.5 cm wide, ovate to +- rounded, tapered at base, obtuse to +- rounded at tip, generally serrate-crenate, generally thin, glabrous, dark green adaxially, pale abaxially. Inflorescence: 8--15 cm. Flower: generally bisexual; calyx 1.2--2 mm, +- toothed, thin, green; petals 2, 3.5--6.5 mm, 1.3--3 mm wide, oblong-ovate, cream-white, +- cupped, narrowed and fused with filaments at base (rarely forming basal tube); anthers 2.4--4.2 mm; filaments 0.8--2.8 mm; stigmas +- < style. Fruit: 20--32 mm, 5--9 mm wide; body broadly oblanceolate, flat, broadly winged to near base; fruit pedicel tip slender. Chromosomes: 2n=46.
Ecology: Canyons, slopes, chaparral, oak/pine woodland; Elevation: 100--1300 m. Bioregional Distribution: KR, NCoR, CaR, SNF, c&s SN, CW, TR, PR. Flowering Time: Apr--Jun
eFlora Treatment Author: Family description, key to genera by Thomas J. Rosatti; treatment of genera by James Henrickson
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botanical illustration including Fraxinus dipetala


Citation for this treatment: Family description, key to genera by Thomas J. Rosatti; treatment of genera by James Henrickson 2016. Fraxinus dipetala, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 06, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 06, 2016.

Fraxinus dipetala
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© 2011 Julie Kierstead Nelson
Fraxinus dipetala
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© 2014 Julie Kierstead Nelson
Fraxinus dipetala
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© 2015 Barry Breckling
Fraxinus dipetala
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© 2015 Barry Breckling
Fraxinus dipetala
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© 2014 Neal Kramer
Fraxinus dipetala
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© 2009 Keir Morse

More photos of Fraxinus dipetala in CalPhotos

Geographic subdivisions for Fraxinus dipetala:
KR, NCoR, CaR, SNF, c&s SN, CW, TR, PR.
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.