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Classification System: APG IV

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

Familia: Geissolomataceae
Genus: Geissoloma
Species: G. marginatum

Geissoloma Lindl. ex Kunth, 1830
Native distribution areas:

Continental: Africa
Regional: Southern Africa
Cape Provinces

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition
Primary references

Lindley, J., 1830. Linnaea; Ein Journal für die Botanik in ihrem ganzen Umfange 5: 678

Additional references

Govaerts, R.H.A. 2003. World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew. [unavailable for the public] Reference page.


Govaerts, R. et al. 2021. Geissoloma 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 10. Reference page.
International Plant Names Index. 2021. Geissoloma. Published online. Accessed: Jul 10 2021. 2021. Geissoloma. Missouri Botanical Garden. Published on the internet. Accessed: 2021 Jul 10.
Hassler, M. 2021. Geissoloma. 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 10. Reference page.
Hassler, M. 2021. World Plants. Synonymic Checklist and Distribution of the World Flora. . Geissoloma. Accessed: 10 Jul 2021.

Vernacular names
русский: Гейсолома

Geissoloma is a genus of flowering plants in the monotypic family Geissolomataceae, native to the Cape Province of South Africa.[2] The plants are xerophytic evergreen shrubs and are known to accumulate aluminum. It is sometimes called guyalone in English.[3]

Geissoloma marginatum is a low evergreen shrub of ½-1¼ m high, covered in overlapping large, leathery, simple, scale-like, opposite leaves in four rows along the stems. It has very small stipules on the petioles. Flowers are bisexual, subtended by bracts, and have four red to pinkish petaloid sepals, four petals partially united, eight stamens, and four carpels. The fruit is a capsule with four seeds.[4]

Geissoloma marginatum is the only species in the family.[5]

Recent phylogenetic analysis resulted in the following tree.[6]


family Strasburgeriaceae




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.
Andrew Millington; Mark Blumler; Udo Schickhoff (2011-09-22). The SAGE Handbook of Biogeography. SAGE Publications. pp. 143–. ISBN 978-1-4462-5445-5. Retrieved 2013-08-07. "The Cape Floristic Region in South Africa is comparatively rich in endemic flowering-plant families. Five families of angiosperms (Penaeaceae, Roridulaceae, Geissolomataceae, Grubbiaceae, and Lanariaceae) are endemic to that region ..."
"Vegetation of SA". PlantsZAfrica.
Forest, F. (2007), "Geissolomataceae", in Klaus Kubitski (ed.), Flowering Plants·Eudicots·Berberidopsiales, Buxiales, Cossosomatales, Fabiales p.p., Geraniales, Gunnerales, Myrtales p.p., Proteales, Saxifragales, Vitales, Zygophyllalaes, Clusiaceae Alliance, Passifloraceae Alliance, Dilleniaceae, Huaceae, Picraminiaceae, Sabiaceae, The Families and Genera of Vascular Plants, 9, ISBN 978-3540322191
Clemens Bayer; P. F. Stevens (2007-04-24). Flowering Plants. Eudicots: Berberidopsidales, Buxales, Crossosomatales, Fabales p.p., Geraniales, Gunnerales, Myrtales p.p., Proteales, Saxifragales, Vitales, Zygophyllales, Clusiaceae Alliance, Passifloraceae Alliance, Dilleniaceae, Huaceae, Picramniaceae, Sabiaceae. Springer. pp. 155–. ISBN 978-3-540-32219-1. Retrieved 2013-08-07. "Geissolomataceae Endl., Ench. Bot. ... A single genus and species, Geissoloma marginatum (L.) A. Juss., restricted to the southern Langeberg mountains in the Cape of South Africa from the Swellendam to Riversdale divisions, on moist ..."
Oh, S.H. (2010). "Phylogeny and systematics of Crossosomatales as inferred from chloroplast atpB, matK, and rbcL sequences". Korean Journal of Plant Taxonomy. 40 (4): 208–217. doi:10.11110/kjpt.2010.40.4.208.

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