Cocos Arechavaletana

''Syagrus romanzoffiana'', the queen palm or cocos palm, is a palm native to South America, introduced throughout the world as a popular ornamental garden tree. ''S. romanzoffiana'' is a medium-sized palm, quickly reaching maturity at a height of up to tall, with pinnate leaves having as many as 494 pinnae ( leaflets), although more typically around 300, each pinna being around in length and in width.

Etymology

Named after Nikolay Rumyantsev (1754–1826), who was Russia's Foreign Minister and Imperial Chancellor and notable patron of the Russian voyages of exploration. He sponsored the first Russian circumnavigation of the globe.

It was previously scientifically known as ''Cocos plumosa'', a name under which it became popular in the horticultural trade in the early 20th century. In some areas of the world the plant is still popularly known as the cocos palm.

Taxonomy

This palm was first scientifically described and validly published as ''Cocos romanzoffiana'' in 1822 in Paris in a folio of illustrations made by the artist Louis Choris, with a description by the French-German poet and botanist Adelbert von Chamisso. Both men had participated in the first Russian scientific expedition around the world under command of Otto von Kotzebue, and funded by Nikolay Rumyantsev, during which they collected this plant in the hinterland of Santa Catarina, Brazil in late 1815.

Meanwhile, in England, sometime around 1825 Loddiges nursery had imported seed of a palm from Brazil which they dubbed ''Cocos plumosa'' in their catalogue, a ''nomen nudum''. The horticulturist John Claudius Loudon in 1830 listed this plant among 3 species of the '' Cocos'' genus then grown in Britain, and mentioned its possible identification as Karl von Martius' ''C. comosa''. One of Loddiges' seedlings had eventually found its way to the new palm stove built at Kew Gardens in the 1840s, where it had grown to a height of 50–60 ft, and where botanists had been determined it to be another of von Martius' species; ''C. coronata''. In 1859 this palm flowered and produced fruit for the first time, which made it clear that its previous identification was incorrect and thus the director of the garden, Joseph Dalton Hooker, 'reluctantly' published a valid description for Loddiges' name ''C. plumosa'' in 1860. ''C. plumosa'' became a popular ornamental plant around the world, and plants continued to be sold under this name as of 2000.

From 1887 onwards Odoardo Beccari published a review of the genus ''Cocos''. Under subgenus ''Arecastrum'' he listed the taxa ''C. romanzoffiana'' of Santa Catarina, ''C. plumosa'' known only from cultivation from seedlings from the plant in Kew, ''C. australis'' of Argentina to Paraguay, ''C. datil'' of eastern Argentina and Uruguay, ''C. acrocomioides'' of Mato Grosso do Sul, ''C. acaulis'' of Piauí, Goiás and recently collected from the mountains of Paraguay bordering Brazil, and ''C. geriba'' (syn. ''C. martiana'') known as a variable species cultivated in gardens throughout Brazil (Rio Grande do Sul, Minas Gerais, Paraná, Rio de Janeiro) and the Mediterranean region. Beccari noted that many of the palms being offered in the catalogues under various species names were actually ''C. geriba''.

In 1912 Alwin Berger reduced the taxon ''C. plumosa'', hitherto still only known from thousands in cultivation around the world yet not known from the wild, to a variety of ''C. romanzoffiana'', as ''C. romanzoffiana'' var. ''plumosa''.

It was first moved from the genus ''Cocos'' in 1891 by Otto Kuntze in his Revisio Generum Plantarum, which was widely ignored, but in 1916 Beccari raised ''Arecastrum'' to a monotypic genus and synonymised all species in the former subgenus to ''A. romanzoffianum''. By this time South American imports of palm seed were being sold across Europe under a plethora of names, according to Beccari often mislabelled but impossible to determine down to 'correct' geographical species, thus he interpreted the taxa to belong to a single extremely variable species. This interpretation was long followed. Beccari also considered ''C. botryophora'' part of this species, an interpretation that is now partially rejected. Beccari recognised the following, now rejected, varieties:
*''Arecastrum romanzoffianum'' var. ''australe'' - from ''C. australis'', ''C. datil''
*''Arecastrum romanzoffianum'' var. ''botryophora'' - from ''C. botryophora''. As this taxon Beccari (mis)identified plants growing in Rio de Janeiro he earlier considered ''C. geriba''. Synonymy later rejected.
*''Arecastrum romanzoffianum'' var. ''ensifolium'' - from ''C. botryophora'' var. ''ensifolium'' of Bahia.
*''Arecastrum romanzoffianum'' var. ''genuinum'' - nominate form. Includes ''C. romanzoffiana'', ''C. plumosa'', ''C. geriba'', ''C. martiana''.
*''Arecastrum romanzoffianum'' var. ''genuinum'' subvar. ''minus'' - from a dwarf individual plant of uncertain origins in cultivation in a private collection in Hyères, France.
*''Arecastrum romanzoffianum'' var. ''micropindo'' - from a population of dwarf plants from Paraguay earlier misidentified as ''C. acaulis''.
Beccari also reinstated Martius' ''Syagrus''.

''Arecastrum'' was subsumed under '' Syagrus'' in 1968.

A genetics study by Bee F. Gunn found that ''S. romanzoffiana'' did not group with the other two ''Syagrus'' species tested, but with ''Lytocaryum weddellianum''. If this has merit, then ''L. weddelianum'', being the junior taxon, becomes ''Arecastrum weddelianum''.

Distribution

It occurs from eastern and central Paraguay and northern Argentina north to eastern and southern Brazil and northern Uruguay. It is quite common in its native range.

In Brazil it occurs in the states of Bahia, Distrito Federal, Goiás, Mato Grosso do Sul, Espírito Santo, Minas Gerais, Rio de Janeiro, São Paulo, Paraná, Rio Grande do Sul and Santa Catarina. In Argentina it occurs in the provinces of Buenos Aires, Chaco, Corrientes, Entre Ríos, Formosa, Mendoza, Misiones (El Dorado, Guaraní, Iguazú), Santa Fe, San Juan and San Luis. In Uruguay it occurs in the departments of Maldonado, Montevideo, Rivera, Rocha, Salto, Tacuarembó and Treinta y Tres. In Paraguay it occurs in the departments of Alto Paraná, Amambay, Caaguazú, Canindeyú, Central, Concepción, Cordillera, Guairá, Ñeembucú, Paraguarí and San Pedro.

Non-native distribution

The queen palm is reportedly naturalized to some extent in Florida, Queensland, Honduras, and the island of Mauritius.

On Mauritius seedlings have been recorded from gardens in the now highly residential area 'Montagne Ory' near the village of Moka from 1981-1984 to at least 1999.

The government of the Australian state of Queensland considers it a potential 'invasive plant', and discourages home-owners from planting it, but it is not prohibited or restricted, or a declared weed. According to the 1989 Flora of Southeastern Queensland it is naturalised in southern Queensland and the Atherton Tableland.

It is not regarded as an invasive or naturalised in New South Wales, although numerous sightings of it have been recorded around Sydney and the coast, including in nature parks. It has been classified as a noxious weed by one local council in New South Wales since at least 2010, as of 2015 it is not prohibited or restricted in the state, but classified as a 'serious threat ... not widely distributed in the area' in one local region. It was possibly first identified as a potential environmental weed for the area in a book from 1998. Sale is discouraged and the palms are being removed.

It is widely planted throughout much of Florida and other parts of the southern United States, although it is not yet widely established in the flora as of 2000.

Ecology

It is a common tree in many habitats.

Birds recorded to eat the fruit pulp from fallen fruit include the rufous-bellied thrush (''Turdus rufiventris''), the bananaquit (''Coereba flaveola''), violaceous euphonia (''Euphonia violacea''), Brazilian tanager (''Ramphocelus bresilius'') and tropical parula (''Parula pitiayumi''). Azure jays (''Cyanocorax caeruleus'') feed on the fruit pulp both picked directly from the infructescence as well as from fallen fruit lying on the ground, usually swallowing the fruits whole or transporting them away from the tree. The two toucans ''Ramphastos vitellinus'' and '' R. dicolorus'' pluck ripe fruits directly from the infructescence and regurgitate the seeds, the gamefowl chachalaca ''Ortalis guttata'' (or a closely related species, depending on one's taxonomic interpretation) and the two related guan ''Penelope obscura'' and '' P. superciliaris'', did so as well, but spread the seeds in their defecations and thus may be important dispersers.

The squirrel ''Guerlinguetus brasiliensis'' ssp. ''ingrami'' is an important seed predator of this palm where the ranges of the two species overlap; breaking the nut open with its teeth at one of the three pores in the top of the nutshell. It preferentially targets bug-infested nuts. A long term study into feeding behaviour of this squirrel in a secondary ''Araucaria'' forest found that although in certain seasons other plants were consumed in larger quantities, the palm nuts were eaten in large quantities throughout the entire year and were thus the most important food item.

Other important seed predators are seed-boring weevils and palm bruchid beetles of the genus ''Pachymerus''. Grubs of ''P. bactris'', ''P. cardo'' and ''P. nucleorum'' have all been found within the seed of this species (among many other species of related South American palms).
The large, colourful weevil ''Revena rubiginosa'' appears to be the main seed predator in numerous areas. It is thought to probably be a specialist seed predator of this palm. It infests the developing seeds before the fruits are ripe, while they are still attached to the infructescence, the grubs exiting the seed to pupate underground around the palm when the fruit fall. Other weevils found to be seed predators of this palm are ''Anchylorhynchus aegrotus'' and ''A. variabilis'', but these species are also flower visitors and likely important specialized pollinators.

The fruit are eaten by tapirs, which might be important seed dispersers, and some wild canids such as the pampas fox and the crab-eating fox.

Three studies in Brazil, in four locations lacking other large frugivores such as squirrels, peccaries, deer and tapirs, found coati ('' Nasua nasua'') to be important seed dispersers in such areas. The coati climb into the palm to get at the fruit, which in one urban study was found in 10% of all stool samples, although it constituted only 2.5% of the total faecal matter. Other important dispersing mammals were agoutis (''Dasyprocta azarae''), which sometimes cache seeds. Black-eared opossum (''Didelphis aurita'') and a russet rice rat (''Euryoryzomys russatus'') were also found among the fallen fruits.

The leaves of this palm are consumed by the caterpillars of the butterflies ''Blepolenis batea'' in Uruguay in 1974, ''Brassolis astyra'' ssp. ''astyra'', ''B. sophorae'' and ''Catoblepia amphirhoe

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