Jepson eFlora: Taxon page
Vascular Plants of California
Key to families | Table of families and genera
Previous taxon Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M |
| N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Next taxon

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.
Reference: Little 1952 J Washington Acad Sci 42:369--380; Miller 1955 Cornell Univ Agric Exp Sta Mem 335:1--64
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
Jepson eFlora Author: Family description, key to genera by Thomas J. Rosatti; treatment of genera by James Henrickson
Reference: Little 1952 J Washington Acad Sci 42:369--380; Miller 1955 Cornell Univ Agric Exp Sta Mem 335:1--64
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

Previous taxon: Fraxinus anomala
Next taxon: Fraxinus latifolia

Name Search

Botanical illustration including Fraxinus dipetala

botanical illustration including Fraxinus dipetala


Citation for this treatment: Family description, key to genera by Thomas J. Rosatti; treatment of genera by James Henrickson 2012, Fraxinus dipetala, in Jepson Flora Project (eds.) Jepson eFlora, /eflora/eflora_display.php?tid=26100, accessed on October 24, 2020.

Citation for the whole project: Jepson Flora Project (eds.) 2020, Jepson eFlora,, accessed on October 24, 2020.

Fraxinus dipetala
click for enlargement
© 2009 Keir Morse
Fraxinus dipetala
click for enlargement
© 2015 Barry Breckling
Fraxinus dipetala
click for enlargement
© 2005 Aaron Schusteff
Fraxinus dipetala
click for enlargement
© 2016 Keir Morse
Fraxinus dipetala
click for enlargement
© 2011 Vernon Smith
Fraxinus dipetala
click for enlargement
© 2009 Barry Breckling

More photos of Fraxinus dipetala in CalPhotos

Geographic subdivisions for Fraxinus dipetala:
KR, NCoR, CaR, SNF, c&s SN, CW, TR, PR.
1. You can change the display of the base map and layers by clicking on the layer control box in the upper right-hand corner.
2. California county polygons can be turned off and on in the layer control box.
3. Filling of Jepson subdivision polygons can be turned off and on in the layer control box.
4. Moving the cursor over any numbered cluster will show the range boundary of the included specimens (with a blue polygon).
5. Marker clustering can be turned off by clicking this link:      Marker Clustering OFF
WARNING: Turning this off might cause maps with large numbers of specimens to load slowly.
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).


View elevation by latitude chart

Data provided by the participants of the  Consortium of California Herbaria.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).