Philodendron roraimae K.Krause
  • H.G.A.Engler, Pflanzenr., IV, 23Db: 123 (1913) 


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

General Description

Stem abbreviated. LEAVES: Petiole robust, flat on the upper side, with a rather broad sheath at the base for ca. 10 cm, 55 cm long, almost 2 cm thick at the base, attenuating upwards. Blade rigid, thickly coriaceous, broadly ovate-cordate, apex shortly acuminate, 45 cm long, up to 30 cm wide; posterior lobes sub-ovate-oblong, obtuse, introrse, separated by a narrow sinus, equal in length to ca. 3/4 the anterior lobe; posterior ribs denuded for 3 cm in the sinus; Basal primary lateral veins 2-3, costal veins 5 on each side, distant, emerging from the robust midrib (1 cm wide at the base, more slender upwards) at an obtuse angle, ascending slightly arcuately near the margin, impressed above, prominent beneath, many slender, lateral secondary and tertiary veins interjected between the primaries. INFLORESCENCE: Peduncle short, robust, 4-6 cm long. Spathe white, oblong-lanceolate, apex shortly apiculate, slightly constricted halfway or somewhat below, 10-12 cm long, convolute ca. 2.5 cm in diameter. Spadix shortly stipitate, somewhat shorter than the spathe; female zone cylindric, 3-3.5 cm long, 1.2-1.6 cm wide; male zone sub-claviform, obtuse, 6-6.5 cm long, somewhat more slender than the female zone. Pistils prismatic, 3 mm long, 1.8 mm wide, with a somewhat bigger rounded stigma, 5-6-locular, locules multiovulate. Male flowers usually tetrandrous.

Diagnostic Description

Not easily confused with any other, though it has leaf blades and cataphylls somewhat like larger plants of Philodendron chimantae. However that species differs in having a petiole which is usually conspicuously winged-angled, at least on the adaxial surface.

Distribution

Endemic to the Guiana highlands from Venezuela, Brazil and without doubt, Guyana, ranging from the northern escarpment forest south of El Dorado to Cerro Roraima in the south.

Distribution Map

 
  • Native distribution
Specimens
Found in
  • Southern America Brazil Brazil North
  • Northern South America French Guiana (Doubtful)
  • Guyana
  • Venezuela

  Bibliography

  • 1 Hokche, O., Berry, P.E. & Huber, O. (eds.) (2008). Nuevo Catálogo de la Flora Vascular de Venezuela: 1-859. Fundación Instituto Botánico de Venezuela.
  • 2 Govaerts, R. & Frodin, D.G. (2002). World Checklist and Bibliography of Araceae (and Acoraceae): 1-560. The Board of Trustees of the Royal Botanic Gardens, Kew.
  • 3 Krause, K. Araceae-Philodendroideae-Philodendreae-Philodendrinae. Das Pflanzenreich. 60 (IV.23Db), (1913).
  • 4 Croat, T.Bernard & Lambert, N." The Araceae of Venezuela. Aroideana. 9 (1-4), (1986).

 Information From

CATE Araceae
http://araceae.e-monocot.org
Haigh, A., Clark, B., Reynolds, L., Mayo, S.J., Croat, T.B., Lay, L., Boyce, P.C., Mora, M., Bogner, J., Sellaro, M., Wong, S.Y., Kostelac, C., Grayum, M.H., Keating, R.C., Ruckert, G., Naylor, M.F. and Hay, A., CATE Araceae, 14 Dec 2011 . 17 Dec 2011.
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eMonocot. (2010, 1st November). Retrieved Wednesday, 8th February, 2012, from http://e-monocot.org.
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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
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