Geraniaceae

Life-forms

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids II
Ordo: Geraniales

Familia: Geraniaceae
Genera: California – Erodium – Geranium – Hypseocharis – Monsonia – Pelargonium – Sarcocaulon

Name

Geraniaceae Juss. Ge. Pl. 268. 1789. nom. cons.
Type genus: Geranium L. Sp. Pl. 2: 676. 1753

Synonyms

Erodiaceae Horan., Char. Ess. Fam.: 192 (1847)

Note: Circumscription follows APG IV (2016) and Stevens (2021) not Govaerts et al. (2021) and Hassler (2021), but it is accepted that some genera are not monophyletic, for example including Sacocaulon in Monsonia renders the later polyphyletic and it may be better to segregate see Govaerts et al. (2021).
References

Jussieu, A.L. de 1789. Genera plantarum, secundum ordines naturales disposita juxta methodum in Horto Regio Parisiensi exaratam. 498 pp. Paris: Herissant et Theophile Barrois. BHL Reference page. : 268.

Additional references

Angiosperm Phylogeny Group. 2016. An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG IV. Botanical Journal of the Linnean Society 181(1): 1–20. DOI: 10.1111/boj.12385 Reference page.

Links

Govaerts, R. et al. 2021. Geraniaceae in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2021 Jul 29. Reference page.
International Plant Names Index. 2021. Geraniaceae. Published online. Accessed: Jul 29 2021.
Stevens, P.F. 2001 onwards. Angiosperm Phylogeny Website. Version 14, July 2017 [and more or less continuously updated since]. Online. Reference page.
Tropicos.org 2021. Geraniaceae. Missouri Botanical Garden. Published on the internet. Accessed: 2021 Jul 29.
Hassler, M. 2021. Geraniaceae. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2021. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2021 Jul 29. Reference page.
Hassler, M. 2021. World Plants. Synonymic Checklist and Distribution of the World Flora. . Geraniaceae. Accessed: 29 Jul 2021.

Vernacular names
Afrikaans: Geraniumfamilie
العربية: غرنوقية
asturianu: Geraniacees
azərbaycanca: Ətirşahkimilər
беларуская: Гераніевыя
български: Здравецови
català: Geraniàcies
čeština: Kakostovité
dansk: Storkenæb-familien
Deutsch: Storchschnabelgewächse
English: Geranium family, Storksbill family
Esperanto: Geraniacoj
español: Geraniáceas
eesti: Kurerehalised
فارسی: شمعدانیان
suomi: Kurjenpolvikasvit
עברית: גרניים
hrvatski: Iglicovke
hornjoserbsce: Pyskowničkowe rostliny
magyar: Gólyaorrfélék
日本語: フウロソウ科
ქართული: ნემსიწვერასებრნი
қазақша: Қазтамақ тұқымдасы
한국어: 쥐손이풀과
kurdî: Famîleya tolgîn û derzîlokan
кыргызча: Каз тамандар
lietuvių: Snaputiniai
македонски: Здравци
Nederlands: Ooievaarsbekfamilie, Geraniumachtigen
norsk nynorsk: Storkenebbfamilien
norsk: Storkenebbfamilien
polski: Bodziszkowate
Runa Simi: Chili-chili yura rikch'aq ayllu
русский: Гераниевые
slovenčina: Pakostovité
svenska: Näveväxter
తెలుగు: జిరానియేసి
Türkçe: Turnagagasıgiller
українська: Геранієві
oʻzbekcha/ўзбекча: Yoronguldoshlar
Tiếng Việt: Họ Mỏ hạc
中文（简体）: 牻牛儿苗科
中文（繁體）: 牻牛兒苗科

Geraniaceae is a family of flowering plants placed in the order Geraniales. The family name is derived from the genus Geranium. The family includes both the genus Geranium (the cranesbills, or true geraniums) and the garden plants called geraniums, which modern botany classifies as genus Pelargonium, along with other related genera.

The family comprises 830 species in five to seven genera. The largest genera are Geranium (430 species), Pelargonium (280 species) and Erodium (80 species).

Description
Flower diagram of Geranium pratense

Geraniaceae are herbs or subshrubs. The Sarcocaulon are succulent, but other members of the family generally are not.

Leaves are usually lobed or otherwise divided, sometimes peltate, opposite or alternate and usually have stipules.

The flowers are generally regular, or symmetrical. They are hermaphroditic, actinomorphic (radially symmetrical, like in Geranium) or slightly zygomorphic (with a bilateral symmetry, like in Pelargonium). The calyx and the corolla are both pentamerous (with five lobes), petals are free while sepals are connate or united at the base. The androecium consists in two whorls of five stamens each, some of which can be unfertile; the pistil consists of five (less commonly three) merged carpels. The linear stigmas are free, and the ovary is superior. The nectaries are localised at the bases of the antesepalous stamens and are formed by the receptacle.[3][4] Pelargonium has only one nectary gland on the adaxial side of the flower. It is hidden in a tube-like cavity which is formed by the receptacle.[3][5] Flower morphology is conserved within Geraniaceae, but there is a large diversity in floral architecture.[3] Flowers are usually grouped in cymes (e.g. in Geranium), umbels (e.g. in Pelargonium) or, more rarely, spikes.

Geraniaceae are normally pollinated by insects, but self-pollination is not uncommon.

The fruit is a unique schizocarp made of five (or three) achenes, in the lower part the achenes are inside the calyx, while the upper part (the stylar beak) is the style of the flower, looking like a kind of long beak over the achenes. When the fruit is mature the style breaks into five (or three) hygroscopically active (ready to absorb water) bristles that curl, causing the achenes to be released.
Differences between the genera

California lacks filaments without anthers (called staminodes), but the lower half of the five fertile stamens is made much wider by a wing with a rounded top on each side of the narrow higher part of the filament that carries an anther. Geranium only has ten fertile stamens without wings and lacks staminodes, except for G. pusillum that only has five stamens. Monsonia only has fifteen fertile stamens, which are merged at their base into a ring or merged at their base in trios with the middle filament longer than the others, except for M. brevirostrata with only five stamens. Erodium has five staminodes and five fertile stamens, without wings. Pelargonium has ten filaments without wings, between two and seven of which are topped by anthers, while the remaining three to eight are staminodes lacking anthers, but it can easily be distinguished by having only one narrow tube-like nectary inside what looks like the flowerstalk.[2]
Taxonomy

Geraniaceae and Francoaceae are the two families included in the order Geraniales under the Angiosperm Phylogeny Group (APG) classification (APG IV).[6] There has been some uncertainty in the number of genera to be included. Stevens gives seven genera listed here,[7] while Christenhusz and Byng[8] state five genera.

Stevens also lists four synonyms of Geranium: Geraniopsis Chrtek Neurophyllodes (A. Gray) O. Degener Robertianum Picard Robertiella

Hypseocharis, with between one and three species, which comes from the south-west Andean region of South America, is considered the sister to the rest of the family. Some authors separate Hyspeocharis as a monogeneric family Hypseocharitaceae,[9] while older sources placed it in the Oxalidaceae. The genus Rhynchotheca has also been separated into the Vivianiaceae.

The Geraniaceae have a number of genetic features unique amongst angiosperms, including highly rearranged plastid genomes differing in gene content, order and expansion of the inverted repeat.[10]
Phylogeny

Recent comparison of DNA-fragments resulted in the following phylogenetic tree.[11]
 

	Hypseocharitaceae   Geraniaceae   Pelargonium       Monsonia including Sarcocaulon         California     Erodium       Geranium

 
 
Distribution and habitat
Most species are found in temperate or warm temperate regions, though some are tropical. Pelargonium has its centre for diversity in the Cape region in South Africa, where there is a striking vegetative and floral variation.

References

Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III". Botanical Journal of the Linnean Society. 161 (2): 105–121. doi:10.1111/j.1095-8339.2009.00996.x.
Aldasoro, Juan José; Navarro, Carmen; Vargas, Pablo; Sáez, Llorenç; Aedo, Carlos (2002). "California, a new genus of Geraniaceae endemic to the southwest of North America" (PDF). Anales del Jardín Botánico de Madrid. 59 (2): 209–216. Retrieved 2017-09-27.
Jeiter, Julius; Hilger, Hartmut H; Smets, Erik F; Weigend, Maximilian (2017-11-10). "The relationship between nectaries and floral architecture: a case study in Geraniaceae and Hypseocharitaceae". Annals of Botany. 120 (5): 791–803. doi:10.1093/aob/mcx101. ISSN 0305-7364. PMC 5691401. PMID 28961907.
Jeiter, Julius; Weigend, Maximilian; Hilger, Hartmut H. (2017-02-01). "Geraniales flowers revisited: evolutionary trends in floral nectaries". Annals of Botany. 119 (3): 395–408. doi:10.1093/aob/mcw230. ISSN 0305-7364. PMC 5314648. PMID 28025289.
Tsai, Timothy; Diggle, Pamela K.; Frye, Henry A.; Jones, Cynthia S. (2018). "Contrasting lengths of Pelargonium floral nectar tubes result from late differences in rate and duration of growth". Annals of Botany. 121 (3): 549–560. doi:10.1093/aob/mcx171. PMC 5838813. PMID 29293992.
APG IV 2016.
Stevens 2016.
Christenhusz & Byng 2016.
Watson, L.; Dallwitz, M.J. (March 2011). "Angiosperm Families - Hypseocharitaceae Weddell". The families of flowering plants: descriptions, illustrations, identification, and information retrieval. Version: 4th. Retrieved April 14, 2012.
Röschenbleck, J. , Albers, F., Müller, K., Weinl, S., Kudla, J. Phylogenetics, character evolution and a subgeneric revision of the genus Pelargonium (Geraniaceae). Phytotaxa Volume 159, Issue 2, 11 February 2014, Pages 31-76[permanent dead link]

Jeiter, Julius; Cole, Theodor C.H.; Hilger, Hartmut H. "Geraniales Phylogeny Poster (GPP) - 2017". ResearchGate. Retrieved 2017-09-27.

Bibliography

APG IV (2016). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG IV". Botanical Journal of the Linnean Society. 181 (1): 1–20. doi:10.1111/boj.12385.
Fiz, Omar; Vargas, Pablo; Alarcón, Marisa; Aedo, Carlos; García, José Luis; Aldasoro, Juan José (1 April 2008). "Phylogeny and Historical Biogeography of Geraniaceae in Relation to Climate Changes and Pollination Ecology" (PDF). Systematic Botany. 33 (2): 326–342. doi:10.1600/036364408784571482. hdl:10261/77646.
Stevens, P.F. (2016) [2001], Angiosperm Phylogeny Website, Missouri Botanical Garden, retrieved 22 June 2016
Christenhusz, Maarten JM & Byng, J. W. (2016). "The number of known plants species in the world and its annual increase". Phytotaxa. 261 (3): 201–217. doi:10.11646/phytotaxa.261.3.1.
Aldasoro, J.J.; Navarro, C.; P . Vargas; Saez, L.; Aedo, C. (2002). "California, a new genus of Geraniaceae endemic to the southwest of North America" (PDF). Anales Jard. Bot. Madrid. 59 (2): 209–216.
Price, Robert A.; Palmer, Jeffrey D. (1993). "Phylogenetic Relationships of the Geraniaceae and Geraniales from rbcL Sequence Comparisons". Annals of the Missouri Botanical Garden. 80 (3): 661–671. doi:10.2307/2399852. JSTOR 2399852.
(in Italian) Sandro Pignatti, Flora d'Italia, Edagricole, Bologna 1982. ISBN 88-506-2449-2
Bakker, F.T., Culham, A., Hettiarachi, P., Touloumenidou, T., Gibby, M., 2004. Phylogeny of Pelargonium (Geraniaceae) based on DNA sequences from three genomes. Taxon 53, 17–28.