Cassytha is a genus of some two dozen species of obligately parasitic vines in the family Lauraceae. Superficially, and in some aspects of their ecology, they closely resemble plants in the unrelated genus Cuscuta, the dodders.Weber, J. Z. A TAXONOMIC REVISION OF CASSYTHA (LAURACEAE) IN AUSTRALIA. J. Adelaide Bot. Gard. 3(3): 187-262(1981) JSTOR When fruit and flowers are absent in the field, the physical resemblance is so close that few people without technical training can discern the difference. In this respect and in their ecology the two genera present a spectacular example of convergent evolution.Nickrent, D. L. 2002. Phylogenetic Origins of Parasitic Plants. Chapter 3, pp. 29–56 In J. A. López-Sáez, P. Catalán and L. Sáez [eds.], Parasitic Plants of the Iberian Peninsula and Balearic Islands. Mundi-Prensa, Madrid. Nonetheless, Nickrent comments that "Cassytha is uneqivocally assigned to Lauraceae based on (both) morphological and molecular data."The Parasitic Plant Connection: Phylogenetic Relationships of Parasitic Flowering Plants In its divergence from habits typical of the Lauraceae, Cassytha also presents examples of mosaic evolutionKuijt, J. 1969. The Biology of Parasitic Flowering Plants. University of California Press, Berkeley, CA.
Several species of Cassytha are regarded as pests in various regions, though as a rule they are not as serious a problem as the true dodders. Some even yield a welcome harvest of fruit, or are valued for their perceived medicinal or aphrodisiac properties, partly because, like many members of the Lauraceae, some are fragrant when bruised. Their stems make useful strings for construction of thatched roofs and certain styles of lei and the like.
Description Cassytha are obligately parasitic, scandent, herbaceous plants with thread-like or wiry stems, which twine around the hostplant clockwise as seen from the source of growth.Isnard Sandrine & Silk Wendy K. "Moving with climbing plants from Charles Darwin’s time into the 21st century" Am. J. Bot. July 2009 vol. 96 no. 7 1205-1221 The vines generally turn yellowish once they have established themselves on a productive host because they then reduce or stop their production of chlorophyll. Cassytha species are stem parasites, adhering to their hosts by uniseriate haustoria that generally are small and oblong. Their leaves are without stipules, alternate, simple, and easily overlooked, being minute and scale-like.
Various species of Cassytha bear flowers in racemes, spikes, or heads. Depending on the species, the flowers are sessile or pedicellate. The individual flowers are hermaphroditic and bracteolate, each being attended by a bract and two smaller bracteoles. In general, the flowers are small, so much so that in many species they are inconspicuous.Coleman, H.R. and Watson, Leslie. Cassytha. October 2008. Western Australian Herbarium (1998–). FloraBase—the Western Australian Flora. Department of Environment and Conservation. http://florabase.dec.wa.gov.au/
The perianth has six tepals, the three outer tepals smaller than the inner. The 12 stamens are in four whorls. The receptacle of the fertilised fruit gradually envelops the ovary, becoming the fleshy part of the ripe fruit, which often retains the dried remnants of the perianth at its tip. In effect, the resulting fruit structure is a tiny drupe. The endocarp is bony and plays an important part in the reproductive process, both in protecting the seed while the fruit is eaten and in inhibiting germination until the endocarp decays, thereby permitting long-lived soil seed banks to accumulate.Morris, D.I. (2009) 5 Lauraceae, version 2009:1. In MF Duretto (Ed.) Flora of Tasmania Online. 5 pp. (Tasmanian Herbarium, Tasmanian Museum & Art Gallery: Hobart). (PDF). www.tmag.tas.gov.au/floratasmaniaDyer, R. Allen, "The Genera of Southern African Flowering Plants". , 1975
Taxonomy The genus was described by Carl Linnaeus in 1753 in his monumental work, Species PlantarumLinné, Carl von, & Salvius, Lars. (1753). Caroli Linnaei ... Species plantarum :exhibentes plantas rite cognitas, ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas... (Vol. 1, p. 35). Impensis Laurentii Salvii. https://www.biodiversitylibrary.org/page/358056 with Cassytha filiformis as the type species. The taxon authorship is sometimes also given to Pehr Osbeck,Cassytha Osbeck. (n.d.). Plants of the World Online. Retrieved July 23, 2025, from https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:21371-1 but Linnaeus supplied the description, and not Osbeck, so the authorship should be given to Linnaeus.
Due to its herbaceous and parasitic habit, distinguishing the genus from all other Lauraceae,Drinnan A., Crane P., Friis M., Pederson K. (1990) Lauraceous flowers form the Potomac group (Mid-Cretaceous) of eastern North America. Botanical Gazette 151: 370-384 Cassytha has historically presented a problem for classification. Most early systems of classification based on morphological characters divided the Lauraceae into two subfamilies: Cassythoideae and Lauroideae;Bentham G & Hooker JD. 1880. Laurineae pp. 146–168 in Genera Plantarum. vol 3, eds. Bentham G & Hooker JD. Reeve L, London.Mez C. 1889. Lauraceae Americanae. Jahrbuch des königlichen botanischen Gartens und des botanischen Museums 5: 1-556.Kostermans AJGH. 1957. Lauraceae. Comm. For. Res. Inst. 57: 1-64.van der Werff H & Richter HG. 1996. Toward an improved classification of Lauraceae. Annals of the Missouri Botanical Garden 83: 409-418. however, more recent molecular data disputes this division.
Based on the trnK intron, a common phylogenetic marker for classifying angiosperms,Hilu KW, Borsch T, Müller K, Soltis DE, Soltis PS, Savolainen V, Chase MW, Powell M, Alice LA, Evans R, Sauquet H, Neinhuis C, Slotta TA, Rohwer JG, Campbell CS, Chatrou L. 2003. Angiosperm phylogeny based on matK sequence information. American Journal of Botany 90: 1758-1776. Rohwer and Rudolph (2005)Rohwer JG & Rudolph B. 2005. Jumping genera: The phylogenetic positions of Cassytha, Hypodaphnis, and Neocinnamomum (Lauraceae) based on different analyses of trnK intron sequences. Annals of the Missouri Botanical Garden 92: 153-178. created a phylogeny of the Lauraceae. They nested Cassytha within the family, more closely related to Caryodaphnopsis, and placed both as sister to the tribe Cryptocaryeae, one of the three tribes of the Lauroideae. More recently, embryological evidence, specifically the development of the anther tapetum, substantiated the close relationship of the two genera, but nested them within the tribe Cryptocareae.Kimoto Y, Utami N, Tobe H. 2006. Embryology of Eusideroxylon (Cryptocaryeae, Lauraceae) and character evolution in the family. Botanical Journal of the Linnean Society 150: 187-201 Ultimately, the exact phylogeny of Cassytha is still in dispute; however, its non-basal placement within the Lauraceae is undoubtedly accurate.
Etymology The genus name Cassytha is derived from the Greek name for the genus Cuscuta,Schroeder, C. A. (1967). The stem parasite Cassytha filiformis a botanical relative of avocado. California Avocado Society Yearbook, 51, 159-160. which it closely resembles.National Parks Board. (n.d.). Cassytha filiformis L. NParks. Retrieved July 23, 2025, from https://www.nparks.gov.sg/florafaunaweb/flora/1/3/1363
Species , Plants of the World Online accepts the following 23 species: Cassytha aurea – southwest Australia Cassytha candida – northern Australia Cassytha capillaris – Assam, Sri Lanka, Vietnam, Borneo, Lesser Sunda Islands, Maluku Islands, New Guinea, northern Australia Cassytha ciliolata – South Africa Cassytha filiformis – The Americas, Australasia, Indomalaya, tropical Africa and Polynesia Cassytha flava – southwest Australia Cassytha flindersii – South Australia Cassytha glabella – Australia Cassytha larsenii – Thailand Cassytha melantha – western and southern Australia Cassytha micrantha – southwest Australia Cassytha nodiflora – southwest Australia Cassytha paniculata – eastern Australia Cassytha pedicellosa – Tasmania Cassytha peninsularis – South Australia Cassytha pergracilis – Ryukyu Islands Cassytha phaeolasia – southeastern Australia Cassytha pomiformis – Western Australia Cassytha pondoensis – southern tropical Africa and South Africa Cassytha pubescens – Australia, New Zealand, Okinawa Cassytha racemosa – southwest Australia Cassytha rufa – Queensland
Some species of the cactus genus Rhipsalis once were assigned to Cassytha in an error arising from the resemblance in habitus. An unfortunate consequence has been that the homonym Cassytha Mill. (1768) is often mentioned as a synonym of the genus Rhipsalis, although this perception is incorrect, since the generic name Cassytha had already been applied to a completely different genus in a different plant family.
The morphology and ecology of Cassytha are so atypical of the family Lauraceae, they have been the subject of molecular genetic research to confirm their taxonomic relationships. Though special aspects to their phylogeny certainly are under debate, their assignment to the Lauraceae generally is regarded as undoubtedly correct.
Common names and confusion Probably the most useful common names for Cassytha species are laurel dodder or dodder laurel, because they look like dodder and are fragrant members of the laurel family, Lauraceae. The name love vine has merit because some species, in particular C. filiformis, are regarded as aphrodisiacs in the Caribbean region.Esbaugh, W. Hardy; McClure, Susan A. & Bolyard, Judith L. Bush Medicine Studies, Andros Island, Bahamas. Proceedings of the first symposium on the botany of the Bahamas 11–14 June 1985. Ed. Robert R. Smith., San Salvador, Bahamas. In practice, the confusion between the various species of Cassytha and Cuscuta is so unavoidable that their common names are more or less interchangeable. Practically all the common names for dodder accordingly are widely applied in error to Cassytha as well, but as a matter of convenience in Florida at least, where members of both groups of plants are present as agricultural pests, a publication of the Department of Agriculture adopts the names woe vine for Cassytha and dodder for Cuscuta.Haynes, Alan R., Coile, Nancy C., Schubert. Timothy S.; "Comparison of Two Parasitic Vines: Dodder (Cuscuta) and Woe Vine (Cassytha)". Botany Circular No. 30. Fla. Dept Agric. & Consumer Services January/February 1996. Division of Plant Industry
Context and distribution Though the Lauraceae constitute a large family, with thousands of species in tens of genera, Cassytha is its only known parasitic genus, and its climbing habit also is atypical of the family; most Lauraceae are woody shrubs or trees. The genus at one time was assigned its own family, Cassythaceae, but currently agreement on its inclusion into the Lauraceae is general.