Itaya H.E.Moore
  • Principes 16: 85 (1972) 


Notes: Distribution: W. South America to N. Brazil

General Description

Moderate, solitary, unarmed, pleonanthic, hermaphroditic palm. Stem smooth (drying roughened), bare except for fibrous remains of sheaths and a lattice of long persistent, split petioles below the crown. Leaves spreading, induplicate, palmate; sheaths short, fibrous, split opposite the petiole, persisting as fibrous margins on the bases of the petioles; petiole elongate, unarmed, the base prominently split, channelled adaxially, rounded abaxially near the base, becoming biconvex and rhomboid in section distally, margins obtuse; adaxial hastula deltoid, often large, basally grooved, abaxial hastula narrow; blade held in one plane, thin, orbicular, divided to ca. 3/4 the radius at the middle, each half again deeply divided into several (4–7) elongate, wedge-shaped, 4–7-fold segments, these very shallowly divided apically into briefly bifid, 1-fold segments, abaxially lighter, midribs very prominent abaxially, transverse veinlets of 2 sizes very prominent. Inflorescences interfoliar, elongate, curved, branched to 3 orders basally, to 1 order distally; peduncle terete; prophyll short, 2-keeled, abaxially split, peduncular bracts ca. 5, bases tubular, apices inflated, acute, coriaceous, persistent, larger than the prophyll, marcescent, lightly tomentose, split on one side; rachis about as long as the peduncle, tapering, ± angled, tomentose; first-order branches each subtended by a persistent, marcescent bract similar to the peduncular bracts but progressively smaller and the upper-most scarcely tubular at the base, the branches ± flattened, adnate to the rachis often nearly to the succeeding bract; rachillae short, rather distant, slightly sinuous, each subtended by a linear acute bract, rachillae bearing spirally arranged, solitary flowers, each on a very short pedicel subtended by a small acute bract. Flowers creamy-white; sepals 3, connate in an acutely 3-lobed cup; petals 3, connate ca. 1/2 their length, the 3 lobes rounded and erect at anthesis, probably valvate in bud; stamens 18–24, one or two opposite each sepal, the remainder opposite the petals, filaments connate basally in a fleshy tube less than 1/2 their length, slightly adnate to corolla basally, fleshy and ± awl-shaped distally, anthers exserted at anthesis, oblong, dorsifixed at the middle, versatile, bifid at apex and base, latrorse; gynoecium of 1 carpel, eccentrically ovoid, narrowed to a slender curved style and oblique papillose stigma, ovule hemianatropous, attached adaxially at the base, the short funicle bearing a large oblique aril. Pollen ellipsoidal, with slight to obvious asymmetry; aperture a distal sulcus; ectexine tectate, coarsely perforate, aperture margin finely perforate; infratectum columellate; longest axis 36–41 µm [1/1]. Fruit oblong-ovoid or subglobose with eccentrically apical stigmatic remains; epicarp minutely granular-roughened and with minute perforations, mesocarp thick, white, dry, with anastamosing fibres and a peripheral layer of sclerosomes, endocarp not differentiated. Seed oblong-ovoid, hilum elliptic, subbasal, raphe branches ascending-spreading, endosperm homogeneous; embryo eccentrically basal. Germination remote-tubular (Chavez 2003); eophyll undivided, elliptic. Cytology: 2n = 36.

Diagnostic Description

Solitary moderate hermaphroditic fan palms of Amazonian rain forest, stems becoming bare; leaves are discolorous, with the blade divided by a central deep split and petiole base split; stamens are numerous and the fruit minutely roughened.

Morphology

Leaf (Uhl 1972c), roots (Seubert 1997), floral (Uhl 1972b).

Biology

Itaya amicorum occurs in rain forest at low elevations.

Distribution

One species, known from a few localities in Amazonian Colombia, Ecuador, Peru and Brazil.

Uses

Itaya is a promising horticultural subject because of its large and handsome leaves much resembling those of Licuala species, its moderate stature, and creamy-white inflorescences and flowers.

Common Names

Not recorded.

Distribution Map

 
  • Native distribution
Found in
  • Southern America Brazil Brazil North
  • Western South America Colombia
  • Ecuador
  • Peru

Included Species

  Bibliography

  • 1 J. Dransfield & N. Uhl & C. Asmussen & W.J. Baker & M. Harley & C. Lewis, Genera Palmarum. The evolution and classification of palms. 2008
  • 2 Govaerts, R. & Dransfield, J. (2005). World Checklist of Palms: 1-223. The Board of Trustees of the Royal Botanic Gardens, Kew.

 Information From

Palmweb - Palms of the World Online
http://www.palmweb.org
Palmweb 2011. Palmweb: Palms of the World Online. Published on the internet http://www.palmweb.org. Accessed on 21/04/2013
  • A Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
  • B http://creativecommons.org/publicdomain/zero/1.0
eMonocot
http://e-monocot.org
eMonocot. (2010, 1st November). Retrieved Wednesday, 8th February, 2012, from http://e-monocot.org.
  • C Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
World Checklist of Selected Plant Families
http://apps.kew.org/wcsp/
WCSP 2014. 'World Checklist of Selected Plant Families. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; http://apps.kew.org/wcsp/ Retrieved 2011 onwards
  • D See http://kew.org/about-kew/website-information/legal-notices/index.htm You may use data on these Terms and Conditions and on further condition that: The data is not used for commercial purposes; You may copy and retain data solely for scholarly, educational or research purposes; You may not publish our data, except for small extracts provided for illustrative purposes and duly acknowledged; You acknowledge the source of the data by the words "With the permission of the Trustees of the Royal Botanic Gardens, Kew" in a position which is reasonably prominent in view of your use of the data; Any other use of data or any other content from this website may only be made with our prior written agreement.