Xanthosoma


Xanthosoma is a genus of flowering plants in the arum family, Araceae. The genus is native to tropical America but widely cultivated and naturalized in other tropical regions. Several are grown for their starchy corms, an important food staple of tropical regions, known variously as malanga, otoy, otoe, cocoyam, tannia, tannier, yautía, macabo, ocumo, macal, taioba, dasheen, quequisque, ape and as Singapore taro. Many other species, including especially Xanthosoma roseum, are used as ornamental plants; in popular horticultural literature these species may be known as ‘ape due to resemblance to the true Polynesian 'ape, Alocasia macrorrhizos, or as elephant ear from visual resemblance of the leaf to an elephant's ear. Sometimes the latter name is also applied to members in the closely related genera Caladium, Colocasia, and Alocasia.
The leaves of most Xanthosoma species are 40-200 cm long, sagittate or subdivided into three or as many as 18 segments. Unlike the leaves of Colocasia, those of Xanthosoma are usually not peltate- the upper v-notch extends into the point of attachment of the leaf petiole to the blade.

Etymology

The name is derived from the Greek words ξανθός, meaning "yellow", and σῶμα, meaning "body". It refers to the stigma or yellow inner tissues.

Reproduction

The inflorescence in Xanthosoma is composed of a spadix with pistillate flowers at the base, a belt of sterile flowers offered as a reward for pollinators in the middle and staminate flowers on the upper part. Prior to opening, the inflorescence is enclosed within a leaf-like spathe. When the inflorescence is ready to open, the upper part of the spathe opens and exposes the staminate area of the spadix; the basal area of the spathe remains closed, forming a spacious chamber that encloses the pistillate and sterile flowers.
The inflorescences last for two nights and are protogynous in some species, changing from the pistillate phase that attracts pollinators on the night it opens, to a staminate phase on the second night, when pollen is shed. When the inflorescence opens, it produces heat and releases a sweet scent attracting its pollinators, dynastine beetles. Dynastines arrive covered with pollen from another inflorescence and remain in the spathe tube for 24 hours, pollinating the pistillate flowers as they feed on the sterile area of the spadix. On the second night, they come out of the tube and walk over the staminate flowers, getting covered with pollen, and then flying to a recently opened inflorescence nearby..
Fruit maturation takes several months. Fruits start to develop within the shelter of the spathe tube. When the infructescence
is mature, in some species, it arches back and downwards. In other species, it stays erect. Then, the tissue of the spathe tube rolls outwards, exhibiting the bright orange fruits and the velvety pink inner spathe surface.

Crop uses

Domestication of Xanthosoma species is thought to have originated in northern lowland South America, then spread to the Antilles and Mesoamerica. Today, Xanthosoma is still grown in all those regions, but is especially popular in Cuba, the Dominican Republic and Puerto Rico, where it is used in alcapurrias or boiled. It is grown in Trinidad and Tobago, Guyana and Jamaica to make the popular callaloo dish. It is also grown in West Africa, now a major producer, where it can be used as a replacement for yams in a popular regional dish called fufu. Xanthosoma is also grown as a crop in the Philippines.
Traditionally, Xanthosoma has been a subsistence crop with excess sold at local markets, but in the United States, large numbers of Latin American immigrants have created a market for commercial production. In general, production has yet to meet demand in some areas. In Polynesia, Alocasia macrorrhizos was considered a famine food, used only in the event of failure of the much preferred taro crop. After having been introduced to Hawaiʻi in the 1920s from S. America, "Xanthosoma" has naturalized and has become more common than A. macrorrhizos, and has adopted the same name, ʻape.
The typical Xanthosoma plant has a growing cycle of 9 to 11 months, during which time it produces a large stem called a corm, this surrounded by smaller edible cormels about the size of potatoes. These cormels are rich in starch. Their taste has been described as earthy and nutty, and they are a common ingredient in soups and stews. They may also be eaten grilled, fried, or puréed. The young, unfurled leaves of some varieties can be eaten as boiled leafy vegetables or used in soups and stews, such as the Caribbean callaloo.
Flour made from Xanthosoma species is hypoallergenic.
;Species
  1. Xanthosoma acutum E.G.Gonç. - French Guiana, Amapá State of Brazil
  2. Xanthosoma akkermansii Croat - Amazonas + Barinas States of Venezuela
  3. Xanthosoma aristeguietae Madison - Venezuela, northwestern Brazil
  4. Xanthosoma auriculatum Regel - northwestern Brazil
  5. Xanthosoma baguense Croat - northern Peru
  6. Xanthosoma bayo G.S.Bunting - Venezuela
  7. Xanthosoma belophyllum Kunth - Colombia, Venezuela, the Guianas; naturalized in Dominican Republic
  8. Xanthosoma bilineatum Rusby - Colombia
  9. Xanthosoma bolivaranum G.S.Bunting - Venezuela
  10. Xanthosoma brasiliense Engl. - Tahitian spinach - Lesser Antilles, Puerto Rico, Hispaniola, Trinidad & Tobago; naturalized in southern Brazil
  11. Xanthosoma brevispathaceum Engl. - Peru
  12. Xanthosoma caladioides Grayum - Panama
  13. Xanthosoma caracu K.Koch & C.D.Bouché - yautia horqueta - Puerto Rico, Dominican Republic
  14. Xanthosoma caulotuberculatum G.S.Bunting - Venezuela
  15. Xanthosoma conspurcatum Schott - Venezuela, Suriname, French Guiana
  16. Xanthosoma contractum G.S.Bunting - Bolívar State of Venezuela
  17. Xanthosoma cordatum N.E.Br. - Guyana, French Guiana
  18. Xanthosoma cordifolium N.E.Br. - Guyana
  19. Xanthosoma cubense Schott - Cuba
  20. Xanthosoma daguense Engl. - Colombia, Ecuador
  21. Xanthosoma dealbatum Grayum - Costa Rica
  22. Xanthosoma eggersii Engl. - Ecuador
  23. Xanthosoma exiguum G.S.Bunting - Amazonas State of Venezuela
  24. Xanthosoma flavomaculatum Engl. - Colombia
  25. Xanthosoma fractum Madison - Peru
  26. Xanthosoma granvillei Croat & Thomps. - French Guiana
  27. Xanthosoma guttatum Croat & D.C.Bay - Valle del Cauca in Colombia
  28. Xanthosoma hebetatum Croat & D.C.Bay - Valle del Cauca in Colombia
  29. Xanthosoma helleborifolium Schott - belembe silvestre - from Costa Rica south to central Brazil; naturalized in West Indies
  30. Xanthosoma herrerae Croat & P.Huang - Colombia
  31. Xanthosoma hylaeae Engl. & K.Krause - Colombia, Ecuador, Peru, Bolivia, northwestern Brazil
  32. Xanthosoma latestigmatum Bogner & E.G.Gonç. - Venezuela
  33. Xanthosoma longilobum G.S.Bunting - Venezuela
  34. Xanthosoma lucens E.G.Gonç - Rondônia
  35. Xanthosoma mafaffoides G.S.Bunting - Amazonas State of Venezuela
  36. Xanthosoma mariae Bogner & E.G.Gonç. - Peru
  37. Xanthosoma maroae G.S.Bunting - Amazonas State of Venezuela
  38. Xanthosoma maximiliani Schott - eastern Brazil
  39. Xanthosoma mendozae Matuda - México State in central México
  40. Xanthosoma mexicanum Liebm. - Chiapas, Oaxaca, Central America, Colombia, Venezuela
  41. Xanthosoma narinoense Bogner & L.P.Hannon - Colombia
  42. Xanthosoma nitidum G.S.Bunting - Venezuela
  43. †Xanthosoma obtusilobum Engl. - Mexico, probably extinct
  44. Xanthosoma orinocense G.S.Bunting - Amazonas State of Venezuela
  45. Xanthosoma paradoxum Bogner - Colombia
  46. Xanthosoma pariense G.S.Bunting - Venezuela
  47. Xanthosoma peltatum G.S.Bunting - Venezuela
  48. Xanthosoma pentaphyllum Engl. - Brazil
  49. Xanthosoma platylobum Engl. - Brazil
  50. Xanthosoma plowmanii Bogner - Brazil
  51. Xanthosoma poeppigii Schott - Peru, Bolivia, northwestern Argentina
  52. Xanthosoma pottii E.G.Gonç. - Mato Grosso do Sul
  53. Xanthosoma puberulum Croat - Bolivia
  54. Xanthosoma pubescens Poepp. - Ecuador, Peru, Bolivia, northwestern Brazil
  55. Xanthosoma pulchrum E.G.Gonç. - Mato Grosso
  56. Xanthosoma riedelianum Schott - southeastern Brazil
  57. Xanthosoma riparium E.G.Gonç. - Goiás
  58. Xanthosoma robustum Schott - capote - Mexico, Central America; naturalized in Hawaii
  59. Xanthosoma sagittifolium Schott - arrowleaf elephant ear, tiquizque, macal, nampi, malanga or American taro - Costa Rica, Panama, Venezuela, Colombia, Ecuador, Peru, Bolivia, Brazil; naturalized in West Indies, Africa, Bangladesh, Borneo, Malaysia, Christmas Island, Norfolk Island, some Pacific Islands, Alabama, Florida, Texas, Georgia, Oaxaca
  60. Xanthosoma saguasense G.S.Bunting - Venezuela
  61. Xanthosoma seideliae Croat - Bolivia
  62. Xanthosoma stenospathum Madison - Peru
  63. Xanthosoma striatipes Madison - Brazil, the Guianas, Venezuela, Colombia, Bolivia, Paraguay
  64. Xanthosoma striolatum Mart. ex Schott - French Guiana, northern Brazil
  65. Xanthosoma syngoniifolium Rusby - Bolivia, Argentina, Brazil
  66. Xanthosoma taioba E.G.Gonç. - Paraíba
  67. Xanthosoma tarapotense Engl. - Peru
  68. Xanthosoma trichophyllum K.Krause - Peru, Ecuador
  69. Xanthosoma trilobum G.S.Bunting - Amazonas State of Venezuela
  70. Xanthosoma ulei Engl. - northwestern Brazil
  71. Xanthosoma undipes K.Koch - tall elephant's ear - widespread from Bolivia north to southern Mexico and West Indies
  72. Xanthosoma viviparum Madison - Peru, Ecuador
  73. Xanthosoma weeksii Madison - Ecuador
  74. Xanthosoma wendlandii Schott Oaxaca, Central America, Venezuela
  75. Xanthosoma yucatanense Engl. - Yucatán, Quintana Roo

    Formerly placed in genus ''Xanthosoma''