Itaya

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For the river in Peru, see Itaya River.
Itaya
Itaya amicorum.JPG
Itaya amicorum
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
(unranked): Commelinids
Order: Arecales
Family: Arecaceae
Subfamily: Coryphoideae
Tribe: Cryosophileae[2]
Genus: Itaya
H.E.Moore
Species: I. amicorum
Binomial name
Itaya amicorum
H.E.Moore

Itaya amicorum is a medium-size fan palm that is native to Brazil, Colombia and Peru. It is the only species in the genus Itaya. It was unknown to science until 1972, when it was discovered on the bank of the Itaya River in the Peruvian Amazon.[3]

Description[edit]

Itaya amicorum is a medium-sized, single-stemmed palm with fan-shaped (or palmate) leaves. The stems reach a height of up to 4 metres (13 ft) with a diameter of 9 to 10 centimetres (3.5 to 3.9 in). Plants have between 11 and 25 leaves which have a roughly circular blade, about 2 m (6.6 ft) in diameter which is split into 10 to 16 broad leaflets, and a long petiole. The leaves have a whitish or silver-grey underside.[4]

Itaya amicorum is pleonanthic—it flowers repeatedly over the course of its lifespan—and hermaphroditic; both male and female sex organs are present in the same flowers.[5] The flowers are whitish in colour, while the fruit are yellowish-green, 2 to 2.5 cm (0.8 to 1.0 in) long, 1.5 to 2 cm (0.6 to 0.8 in) in diameter.

Taxonomy[edit]






Coccothrinax



Hemithrinax



Leucothrinax




Zombia





Thrinax




Schippia



Cryosophila






Itaya




Chelyocarpus


Simplified phylogeny of the tribe Cryosophileae (except Trithrinax) based on the nuclear genes PKR and RPB2.[6]

Itaya is a monotypic genus—it includes only a single species, I. amicorum.[7] The species was first collected in 1972 along the Rio Itaya in Peru, and was described by Harold E. Moore the same year.[4] In the first edition of Genera Palmarum (1987), Natalie Uhl and John Dransfield placed the genus Itaya in the subfamily Coryphoideae, the tribe Corypheae and the subtribe Thrinacinae[5] Subsequent phylogenetic analysis showed that the Old World and New World members of the Thrinacinae were not closely related. As a consequence of this, Itaya and related genera were places in their own tribe, Cryosophileae.[2]

Distribution[edit]

Itaya amicorum is found only in the western Amazon basin in Brazil, Colombia and Peru. Originally thought to be endangered due to its narrow distribution, the species is now known to be more widely distributed.[4] The IUCN Red List categorises the species as data deficient.[1]

Uses[edit]

The Miraña, an indigenous Amerindian group in the Amazon, reportedly burn the trunks of Itaya amicorum in order to extract salt from them. The leaves are used for thatch.[4]

References[edit]

  1. ^ a b Bernal, R. 1998. Itaya amicorum. 2006 IUCN Red List of Threatened Species. Downloaded on 20 July 2007.
  2. ^ a b Dransfield, John; Natalie W. Uhl; Conny B. Asmussen; William J. Baker; Madeline M. Harley; Carl E. Lewis (2005). "A New Phylogenetic Classification of the Palm Family, Arecaceae". Kew Bulletin. 60 (4): 559–69. JSTOR 25070242. 
  3. ^ Piptocarpha (Compositae: Vernonieae). Flora Neotropica. New York: New York Botanical Garden Press. 2007. p. 51. ISBN 978-0-89327-482-5. OCLC 77504368. 
  4. ^ a b c d Henderson, Andrew; Gloria Galeano; Rodrigo Bernal (1995). Field Guide to the Palms of the Americas. Princeton, New Jersey: Princeton University Press. pp. 41–42. ISBN 0-691-08537-4. 
  5. ^ a b Uhl, Natalie E.; John Dransfield (1987). Genera Palmarum: a classification of palms based on the work of Harold E. Moore Jr. Lawrence, Kansas: The L. H. Bailey Hortorium and the International Palm Society. pp. 175–177. 
  6. ^ Roncal, Julissa; Scott Zona; Carl E. Lewis (2008). "Molecular Phylogenetic Studies of Caribbean Palms (Arecaceae) and Their Relationships to Biogeography and Conservation". Botanical Review. 74 (1): 78–102. doi:10.1007/s12229-008-9005-9. 
  7. ^ J. Dransfield & N. W. Uhl (1998). "Palmae". In Klaus Kubitzki. Flowering plants, Monocotyledons: Alismatanae and Commelinanae (except Gramineae). The families and genera of vascular plants. 4. Springer. p. 361. ISBN 978-3-540-64061-5.