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Hibiscus denudatus

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: HibiscusView DescriptionDichotomous Key

Common Name: HIBISCUS
Habit: Annual, perennial herb, subshrub [shrub, tree]. Stem: generally erect, bristly or stellate-hairy to +- glabrous. Leaf: generally simple, cordate, palmate-lobed or -divided or not, +- entire to dentate or crenate-dentate, palmate-veined, tip acute or acuminate; stipules generally persistent. Inflorescence: raceme, open, or flowers 1 in leaf axils; flowering stalks often jointed in upper 1/3; bractlets 8--10(20), free or basally fused, generally narrow, persistent. Flower: generally showy, open <= 1 day; calyx 5-lobed; petals white, yellow, lavender, red, or other colors, often with dark basal spot; filament tube 5-toothed at tip, anthers scattered on upper 1/2 below tip; style distally 5-branched, stigmas head-like. Fruit: capsule loculicidal, 5-chambered, ovoid or oblong, glabrous or hairy. Seed: several per chamber, hairy or +- glabrous.
Species In Genus: 200 species: especially America, Africa, Asia, Australia. Etymology: (Greek: hibiscos, a name for a mallow) Note: Other taxa, such as Hibiscus syriacus L., rose-of-Sharon, cultivated, possibly escaped.
Unabridged Reference: Fryxell 1988 Syst Bot Monogr 25:192--232

Hibiscus denudatus Benth.
Habit: Subshrub, densely stellate-hairy. Stem: 0.5--1 m, generally tangled-branched. Leaf: blade 1--3 cm, ovate, truncate, finely toothed, densely stellate-hairy abaxially, adaxially; stipules 2--3 mm. Inflorescence: flowers 1 in leaf axils; flowering stalks 0.5--1.5 cm; bractlets 0.5--4 mm, persistent [(0)]. Flower: sepals 11--15 mm, fused at base; petals 2--2.7 cm, white or lavender, base generally purple; stamen column 8--9 mm. Fruit: 7--8 mm, +- <= calyx, spheric, spread wide open at maturity, glabrous or at tip hairy. Seed: +- 2.5 mm, reniform, densely silky, hairs 3--4 mm. Chromosomes: 2n=22.
Ecology: Desert scrub of mesas, canyons, creosote-bush scrub; Elevation: < 800 m. Bioregional Distribution: DSon; Distribution Outside California: to Nevada, western Texas, northern Mexico. Flowering Time: Feb--May
Synonyms: Hibiscus denundatus var. involucellatus A. Gray;
eFlora Treatment Author: Steven R. Hill
Unabridged Reference: Fryxell 1988 Syst Bot Monogr 25:192--232
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botanical illustration including Hibiscus denudatus


Citation for this treatment: Steven R. Hill 2012, Hibiscus denudatus, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on September 21, 2018.

Citation for the whole project: Jepson Flora Project (eds.) 2018, Jepson eFlora,, accessed on September 21, 2018.

Hibiscus denudatus
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© 2012 Keir Morse
Hibiscus denudatus
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© 2015 Keir Morse
Hibiscus denudatus
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© 2009 Barry Breckling
Hibiscus denudatus
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© 2009 Thomas Stoughton
Hibiscus denudatus
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© 1998 Christopher L. Christie
Hibiscus denudatus
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© 2011 Neal Kramer

More photos of Hibiscus denudatus in CalPhotos

Geographic subdivisions for Hibiscus denudatus:
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.