Jepson eFlora: Taxon page
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Aeonium haworthii

Higher Taxonomy
Family: CrassulaceaeView DescriptionDichotomous Key

Habit: Annual to shrub [(+- tree-like or climbing)], fleshy. Leaf: generally simple, alternate or opposite, in dense to open, basal (or terminal) rosettes or basal and cauline, not in rosettes, reduced distally or not, margin often +- red. Inflorescence: generally cyme, generally bracted. Flower: generally bisexual; sepals generally 3--5, generally +- free; petals generally 3--5, +- free or fused; stamens >> to = sepals, epipetalous or not; pistils generally 3--5, simple, fused at base or not, ovary 1-chambered, placenta 1, parietal, ovules 1--many, style 1. Fruit: follicles, generally 3--5. Seed: 1--many, small.
Genera In Family: +- 33 genera, +- 1400 species: +- worldwide, especially dry temperate; many cultivated for ornamental. Note: Water-stressed plants often +- brown or +- red. Consistent terminology regarding leaves, bracts difficult; in taxa with rosettes (e.g., Aeonium, Dudleya, some Sedum), structures in rosettes are leaves, those on peduncles are bracts, and those subtending flowers are flower bracts; in taxa where inflorescence is terminal, rosette leaves may "become" bracts as stem rapidly elongates to form inflorescence. Seed numbers given per follicle.
eFlora Treatment Author: Steve Boyd, except as noted
Scientific Editor: Thomas J. Rosatti.
Genus: AeoniumView DescriptionDichotomous Key

Habit: [Perennial herb] to shrub. Leaf: rosettes near stem tips, leaves alternate, generally obovate to oblanceolate, ciliate [or not]. Inflorescence: terminal; branches many, flowers on 1 side. Flower: erect, calyx, corolla not circumscissile in fruit; sepals [6]7--11[16], +- fused basally; petals = sepals in number, +- free, > sepals, cream or bright yellow; stamens 2 × sepals in number; pistils erect, +- free. Seed: many, 0.4--0.6 mm, ellipsoid, striate, brown.
Species In Genus: 31 species: Africa, Yemen, Madeira, Cape Verde, especially Canary Islands. Etymology: (Latin: name given to Aeonium arboreum by Dioscorides, Greek botanist)

Aeonium haworthii Webb & Berthel.
Habit: [Sub]shrub +- 7 dm, densely hemispheric. Stem: 3--10 mm diam. Leaf: rosettes generally open, < 10 cm diam, leaves 3--6 cm, 2--5 mm thick, obovate. Inflorescence: open, flat-topped to hemispheric. Flower: +- 1 cm wide; sepals 3--4 mm, 1.5--2 mm wide; petals lanceolate, 7--9 mm, 1.2--1.8 mm wide. Chromosomes: 2n=72.
Ecology: Sea cliffs, dunes, or persisting from cultivation; Elevation: < 100 m. Bioregional Distribution: c&s SCo; Distribution Outside California: native to Canary Islands. Flowering Time: Apr--Jul
eFlora Treatment Author: Steve Boyd
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Previous taxon: Aeonium arboreum var. arboreum
Next taxon: Cotyledon

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Citation for this treatment: Steve Boyd 2016. Aeonium haworthii, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 05, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 05, 2016.

Geographic subdivisions for Aeonium haworthii:
c&s SCo;
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.
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.
Blue line denotes eFlora flowering time.