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Horsfordia alata

Higher Taxonomy
Family: MalvaceaeView DescriptionDichotomous Key

Habit: Annual to tree; generally with stellate hairs, often with bristles or peltate scales; juice generally mucilage-like; bark fibrous. Leaf: generally cauline, alternate, petioled, simple [palmate-compound], generally palmate-lobed and/or veined, generally toothed, evergreen or not; stipules persistent or not. Inflorescence: head, spike, raceme, or panicle, in panicle or not (a compound panicle), or flowers >= 1 in leaf axils, or flowers generally 1 opposite a leaf or on a spur; bracts leaf-like or not; bractlets 0 or on flowering stalks, often closely subtending calyx, generally in involucel. Flower: generally bisexual, radial; sepals 5, generally fused at base, abutting in bud, larger in fruit or not, nectaries as tufts of glandular hairs at base; petals (0)5, free from each other but generally fused at base to, falling with filament tube, clawed or not; stamens 5--many, filaments fused for most of length into tube around style, staminodes 5, alternate stamens, or generally 0; pistil 1, ovary superior, stalked or generally not, chambers generally >= 5, styles or style branches, stigmas generally 1 or 1--2 × chamber number. Fruit: loculicidal capsule, [berry], or 5--many, disk- or wedge-shaped segments (= mericarps).
Genera In Family: 266 genera, 4025 species: worldwide, especially warm regions; some cultivated (e.g., Abelmoschus okra; Alcea hollyhock; Gossypium cotton; Hibiscus hibiscus). Note: Recently treated to include Bombacaceae, Sterculiaceae, Tiliaceae. Mature fruit needed for identification; "outer edges" are surfaces between sides and back (abaxial surface) of segment. "Flower stalk" used instead of "pedicel," "peduncle," especially where both needed (i.e., when flowers both 1 in leaf axils and otherwise).
eFlora Treatment Author: Steven R. Hill, except as noted
Scientific Editor: Steven R. Hill, Thomas J. Rosatti.
Genus: HorsfordiaView DescriptionDichotomous Key

Habit: [Subshrub], shrub, densely stellate-tomentose or -scabrous. Stem: erect. Leaf: petiole stout; blade lanceolate to +- round or cordate, +- entire or irregularly fine-toothed; stipules 2--5 mm. Inflorescence: axillary racemes clustered terminally or flowers 1 in leaf axils [panicle]; bractlets 0. Flower: petals white, yellow, blue-lavender, rose, or pink; anthers at tip of filament tube; styles 6--11, > anthers, stigmas head-like. Fruit: +- glabrous; segments 6--12, below indehiscent, firm, net-veined, above dehiscent, with 2 spreading, scarious wings. Seed: 1--3 per segment, puberulent or minutely ridged.
Species In Genus: 4 species: southwestern United States, northwestern Mexico. Etymology: (F.H. Horsford, Vermont botanist, collector, 1855--1923)
eFlora Treatment Author: John C. La Duke
Unabridged Reference: Fryxell 1985 Syst Bot 10:268--272; Fryxell 1988 Syst Bot Monogr 25:234--240

Horsfordia alata (S. Watson) A. Gray
Stem: 1--2.5(4) m, gray-yellow. Leaf: petioles << blade; blade 4--11 cm, ovate, finely toothed, base +- cordate, tip acute. Inflorescence: flowering stalks 2--17 mm. Flower: calyx 5--7 mm, lobed 1/2; styles 9--10. Fruit: 7--8 mm diam, generally +- purple on top, segments 9--10, lower part 1-seeded, upper generally with 2 aborted ovules; wings +- 6 mm, 3 mm wide. Seed: 1 per segment, dark brown. Chromosomes: 2n=30.
Ecology: Rocky canyons, washes; Elevation: generally 100--600 m. Bioregional Distribution: DSon; Distribution Outside California: southwestern Arizona, northwestern Mexico. Flowering Time: Dec--Apr
Jepson eFlora Author: John C. La Duke
Unabridged Reference: Fryxell 1985 Syst Bot 10:268--272; Fryxell 1988 Syst Bot Monogr 25:234--240
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Listed on CNPS Rare Plant Inventory

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botanical illustration including Horsfordia alata


Citation for this treatment: John C. La Duke 2012, Horsfordia alata, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on November 18, 2018.

Citation for the whole project: Jepson Flora Project (eds.) 2018, Jepson eFlora,, accessed on November 18, 2018.

Geographic subdivisions for Horsfordia alata:
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.