Isotoma

Life-forms

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Campanulids
Ordo: Asterales

Familia: Campanulaceae
Subfamilia: Lobelioideae
Genus: Isotoma
Species: I. armstrongii – I. baueri – I. fluviatilis – I. gulliveri – I. hypocrateriformis – I. luticola – I. pusilla – I. rivalis – I. scapigera – I. tridens
Name

Isotoma (R.Br.) Lindl., Bot. Reg. 12: t. 964 (1826)

Type species: Isotoma hypocrateriformis (R.Br.) Druce, Rep. Bot. Soc. Exch. Club Brit. Isles 1916: 629 (1917)

References

Lindley, J., 1826. Botanical Register; Consisting of Coloured Figures of Exotic Plants Cultivated in British Gardens; with their History and Mode of Treatment. London 12: t. 964. Reference page.
Knox, E.B. 2014. The dynamic history of plastid genomes in the Campanulaceae sensu lato is unique among angiosperms. Proceedings of the National Academy of Sciences 111(30): 11097–11102. DOI: 10.1073/pnas.1403363111 PDF Reference page.

Links

Govaerts, R. et al. 2019. Isotoma in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2019 July 15. Reference page.
International Plant Names Index. 2014. Isotoma. Published online. Accessed: July 15 2014.
Tropicos.org 2014. Isotoma. Missouri Botanical Garden. Published online. Accessed: 15 July 2014.

Vernacular names
русский: Изотома

Isotoma is a genus of annual and perennial herbs in the family Campanulaceae and are native to Australia and New Zealand.

Description

Plants in the genus Isotoma have milky sap, a distinct taproot and sometimes adventitious roots along the branches. The leaves are arranged alternately and are usually toothed or lobed. The flowers are solitary in leaf axils or arranged in groups on the ends of branchlets. The sepals form a short tube with lobes. The petal tube is slightly zygomorphic with five lobes spreading horizontally, the upper two smaller and the lower three often with distinct markings. The stamens are fused to the petal tube. The fruit is an urn-shaped or conical capsule containing a large number of minute seeds.[2][3]
Taxonomy and naming

In 1810, in his book Prodromus Florae Novae Hollandiae et Insulae Van Diemen, Robert Brown described Lobelia hypocrateriformis and placed it in section Isotoma.[4][5] Then in 1826, based on Brown's description, John Lindley raised the genus Isotoma in The Botanical Register.[6][7] The name Isotoma is derived from ancient Greek words meaning "equal" and "a piece cut off" or "a slice". The name was originally applied to the section Isotoma because those species differ from true lobelias in having petal lobes that are almost equal in size.[8]
Species list

The following is a list of species and subspecies accepted by the Australian Plant Census as at September 2020:[9]

Isotoma anethifolia Summerh. – NSW, QLD
Isotoma axillaris Lindl. – NSW, QLD, VIC
Isotoma fluviatilis (R.Br.) F.Muell. ex Benth. – NSW, QLD, SA, TAS, VIC
Isotoma fluviatilis subsp. australis McComb
Isotoma fluviatilis subsp. borealis McComb
Isotoma fluviatilis (R.Br.) F.Muell. ex Benth. subsp. fluviatilis
Isotoma gulliveri F.Muell. – QLD
Isotoma hypocrateriformis (R.Br.) Druce – WA
Isotoma luticola Carolin – NT
Isotoma petraea F.Muell. – NSW, NT, QLD, SA, WA
Isotoma pusilla Benth. – WA
Isotoma scapigera (R.Br.) G.Don – SA, WA
Isotoma tridens (E.Wimm.) Lammers – NSW, VIC

References
Wikimedia Commons has media related to Isotoma.

"Isotoma". Australian Plant Census. Retrieved 11 April 2020.
Wiecek, Barbara M. "Genus Isotoma". Royal Botanic Garden Sydney. Retrieved 11 April 2020.
Albrecht, David E.; Walsh, Neville G. "Isotoma". Royal Botanic Gardens, Victoria. Retrieved 11 April 2020.
"Lobelia sect. Isotoma". APNI. Retrieved 11 April 2020.
Brown, Robert (1810). Prodromus florae Novae Hollandiae et insulae Van-Diemen, exhibens characteres plantarum quas annis 1802-1805. London: Typis R Taylor, veneunt apud J. Johnson. p. 565. Retrieved 11 April 2020.
"Isotoma". APNI. Retrieved 11 April 2020.
Lindley, John (1826). "The Botanical Register". The Botanical Register. 12: 964. Retrieved 11 April 2020.
Francis Aubie Sharr (2019). Western Australian Plant Names and their Meanings. Kardinya, Western Australia: Four Gables Press. p. 88. ISBN 9780958034180.
"Isotoma". Australian Plant Census. Retrieved 2 September 2021.