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Geranium robertianum

Higher Taxonomy
Family: GeraniaceaeView DescriptionDichotomous Key

Habit: Annual, perennial herb, or +- woody, generally glandular-hairy. Leaf: simple to compound, basal and cauline; cauline alternate or opposite, stipules 2, +- on stem. Inflorescence: cyme or pseudo-umbel or 1--2-flowered. Flower: bisexual [unisexual], radial or +- bilateral; sepals 5, free, overlapping in bud; petals generally 5, free, generally with nectar glands at base; stamens generally 5,10[15]; staminodes scale-like or 0; ovary generally 5-lobed, upper part elongating into beak in fruit, chambers 5, placentas axile, style 1, stigmas 5, free, persistent in fruit. Fruit: septicidal [loculicidal], mericarps 5, dry, generally 1-seeded, each persistent on 1 of 5 linear segments of beak that separate from central column by curving or coiling upward.
Genera In Family: 6 genera, +- 750 species: temperate, +- tropics. Some cultivated for ornamental, perfume oils.
eFlora Treatment Author: Carlos Aedo, except as noted
Scientific Editor: Thomas J. Rosatti.
Genus: GeraniumView DescriptionDichotomous Key

Habit: Annual, perennial herb, often +- glandular, especially above. Stem: generally 1--4 mm wide in lower 1/2. Leaf: palmately lobed to divided, +- hairy; segments generally palmately lobed and/or toothed; upper alternate or opposite; blade generally round in outline, base generally cordate. Inflorescence: (1)2-flowered. Flower: radial (+- bilateral); sepals +- awned to mucronate; stamens 10, outer 5 opposite petals (lacking anthers in G. pusillum), inner 5 alternate petals, nectary glands 5, alternate petals. Fruit: mericarp generally ovoid, dehiscent, 1-seeded; basal callus generally present, often with long bristles.
Species In Genus: +- 400 species: temperate, tropical mountains. Etymology: (Greek: crane, from fruit beak)

Geranium robertianum L.
Habit: Annual, biennial. Stem: decumbent to ascending, 1--5 dm, 1--3 mm wide in lower 1/2, hairs +- sparse. Leaf: blade 3.5--10 cm wide; divided > 0.9 to base or midrib, segments 5, +- sessile to short-stalked, pinnately lobed to dissected. Flower: pedicel 5--20 mm; sepals 6--8 mm, smooth, soft-hairy, awned; petals 10--14 mm, rounded, pink to red-purple; anthers +- purple. Fruit: mericarp 2.5--3.1 mm, net-like, with 1--3 collar-like rings and long fibers at tip, glabrous or hairy, basal callus 0; beak 17--19 mm, narrow tip 4--5 mm; stigmas +- 1 mm. Seed: smooth. Chromosomes: 2n=64.
Ecology: Open to shaded sites; Elevation: < 500 m. Bioregional Distribution: NCo, CCo, SnFrB; Distribution Outside California: widespread North America; native to Europe, northern Africa, western Asia; alien in South America, China, Madagascar. Flowering Time: Apr--Sep
eFlora Treatment Author: Carlos Aedo
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botanical illustration including Geranium robertianum


Citation for this treatment: Carlos Aedo 2016. Geranium robertianum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on February 12, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on February 12, 2016.

Geranium robertianum
click for enlargement
© 2013 Neal Kramer
Geranium robertianum
click for enlargement
© 2015 Barry Breckling
Geranium robertianum
click for enlargement
© 2011 Neal Kramer
Geranium robertianum
click for enlargement
© 2015 Barry Breckling
Geranium robertianum
click for enlargement
© 2013 Neal Kramer
Geranium robertianum
click for enlargement
© 2013 Neal Kramer

More photos of Geranium robertianum in CalPhotos

Geographic subdivisions for Geranium robertianum:
NCo, CCo, SnFrB;
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.