Philodendron callosum K.Krause
  • H.G.A.Engler, Pflanzenr., IV, 23Db: 28 (1913) 

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

General Description

Stem abbreviated. LEAVES: Petiole robust, somewhat flattened on the upper surface, and rather deeply canaliculated, 28-35 cm long, 1.5-2 cm thick at the base, somewhat attenuating upwards, the lower ? or 1/4 narrowly sheathed; Blade rigid, thickly coriaceous, rather glossy above, lanceolate or oblong-lanceolate, apex shortly oblique, cuspidate-acuminate, gradually narrowing towards the base, the extreme base somewhat obtuse, 30-50 cm long, 12-16 cm wide. Lateral veins all subequal, very numerous and very dense, departing the midrib (which is 6-9 mm wide, narrowing upwards) at an obtuse or very obtuse angle, arcuate-ascending towards the margin, distinctly prominent on both sides. INFLORESCENCE: Peduncle terete, moderately robust, 8-10 cm long, 8 mm thick. Spathe externally white or green towards the base, internally pale purplish, tube broadly ovoid, 3.5 cm long and almost equal-sided, blade ovate-oblong, apex shortly apiculate, 4.5-5 cm long, 4 cm wide. Spadix subtended by a 6-8 mm long stipe, female zone cylindric, 1.5-2 cm long, 1 cm thick, male zone claviform, apex obtuse, 5-6 cm long, equally thick as the lower, female zone or somewhat thicker, narrowing upwards. Pistil ovoid-oblong, stigma small round-raised, ca. 2 mm long, 1.5 mm thick, many locules [Mayo observed 2 locules], locules with few ovules. Male flowers 2-4 androus.

Distribution Map

  • Native distribution
Found in
  • Southern America Brazil Brazil North
  • Northern South America French Guiana
  • Guyana
  • Venezuela


  • 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).

 Information From

CATE Araceae
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
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World Checklist of Selected Plant Families
WCSP 2014. 'World Checklist of Selected Plant Families. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; Retrieved 2011 onwards
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