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Vascular Plants of California
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Hibiscus trionum
FLOWER-OF-AN-HOUR


Higher Taxonomy
Family: MalvaceaeView DescriptionDichotomous Key
Common Name: MALLOW FAMILY
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 trionum L.
NATURALIZED
Habit: Annual, bristly. Stem: erect, 0.3--0.6 m, branches prostrate or not. Leaf: blade +- 5 cm, 2--3 cm wide, 3--5-lobed or -divided, coarsely toothed, stellate-hairy abaxially, glabrous adaxially. Inflorescence: flowers 1 in leaf axils; bractlets 10, free +- to base, 7--8(10) mm, << calyx. Flower: calyx fused +- to tip, 5-ridged or -winged, veiny, inflated, papery in fruit; petals +- 2 cm, yellow, base purple-black; filament tube +- 11 mm. Fruit: 1.5--2 cm, enclosed within, <= calyx. Seed: 2--2.5 mm, reniform, sparsely hairy. Chromosomes: 2n=28,56.
Ecology: Uncommon. Disturbed places; Elevation: generally < 350(1450) m. Bioregional Distribution: CA-FP; Distribution Outside California: native to Europe, central Africa. Flowering Time: Apr--Nov
Jepson eFlora Author: Steven R. Hill
Unabridged Reference: Fryxell 1988 Syst Bot Monogr 25:192--232
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botanical illustration including Hibiscus trionum

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Citation for this treatment: Steven R. Hill 2012, Hibiscus trionum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=28237, accessed on July 22, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on July 22, 2019.

No expert verified images found for Hibiscus trionum.



Geographic subdivisions for Hibiscus trionum:
CA-FP
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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.
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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.