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Fraxinus anomala
SINGLE-LEAF ASH

Higher Taxonomy
Family: OleaceaeView DescriptionDichotomous Key

Common Name: OLIVE FAMILY
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 anomala S. Watson
NATIVE
Habit: Shrub to tree, 1.5--5 m. Stem: many; bark gray; twigs generally 4-angled, tan; buds glandular-puberulent. Leaf: simple and/or compound; petiole 1.2--3 cm; blade narrowly ovate to +- rounded, cordate to tapered at base, acute to rounded at tip, generally crenate-serrate to +- entire, thick, glabrous, yellow-green; if compound, leaflets 3--5, 2--10 cm, 1.5--6 cm wide. Inflorescence: 3--9 cm; bracts glandular-puberulent. Flower: generally bisexual; calyx 1.2--1.5 mm, irregularly cut, thin, green to +- purple; petals generally 0; anthers 1.5--2.5 mm, filaments 2--2.5 mm; stigma <= style. Fruit: 13--24 mm, 5--11 mm wide; body oblong-oblanceolate, broadly winged to near base; fruit pedicel tip slender. Chromosomes: 2n=46.
Ecology: Washes, rocky slopes, shrubland, pinyon/juniper woodland; Elevation: 1100--2400 m. Bioregional Distribution: n&e DMtns; Distribution Outside California: to Colorado, New Mexico. Flowering Time: Apr--May Note: Flowers bisexual but only 1/2 of plants produce fruit; plants rarely with petals, source of erroneous reports of Fraxinus dipetala in D.
Unabridged Note: Expanded author citation: Fraxinus anomala Torr. ex S. Watson
eFlora Treatment Author: Family description, key to genera by Thomas J. Rosatti; treatment of genera by James Henrickson
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Citation for this treatment: Family description, key to genera by Thomas J. Rosatti; treatment of genera by James Henrickson 2016. Fraxinus anomala, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=26094, accessed on February 11, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 11, 2016.


Fraxinus anomala
click for enlargement
© 2011 Steve Matson
Fraxinus anomala
click for enlargement
© 2011 Steve Matson
Fraxinus anomala
click for enlargement
© 2011 Steve Matson
Fraxinus anomala
click for enlargement
© 2011 Steve Matson
Fraxinus anomala
click for enlargement
© 2011 Steve Matson

More photos of Fraxinus anomala in CalPhotos


Geographic subdivisions for Fraxinus anomala:
n&e DMtns;
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.
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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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Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.