Philodendron radiatum Schott
  • Oesterr. Bot. Wochenbl. 3: 378 (1853) 

Notes: Distribution: Mexico to N. Colombia

General Description

Epiphytic or hemiepiphytic, rarely terrestrial; stem appressed-climbing, creeping if terrestrial, sap clear to orange, watery, sticky, leaf scars conspicuous, 2--4(7.5) cm long, 2.5--6(7) cm wide; internodes thick, 3--7(12) cm long, (1)3--8 cm diam., about as long as broad or longer than broad, dark green to gray-green, sometimes scurfy and light brownish tan, transverally lined (raised 2 mm); roots 4 mm diam., with swollen nodes and branched tips; cataphylls to 38 cm long, soft, bluntly to sharply 2-ribbed, rarely unribbed, green, sometimes conspicuously reddish lineate, deciduous. LEAVES: Petioles 283--108 cm long, (2-3)4--17 mm diam., terete or subterete to obtusely flattened adaxially, dark green, surface dark greenish or to greenish red-lineate; sheath persisting, sometimes moderately spongy; blades more or less triangular-ovate in outline, (15)27--101 cm long, (11)25--90 cm wide (ca. 0.8--2.1 times longer than wide) (0.5--1.7 times longer than petiole), broadest at point of petiole attachment, thinly coriaceous, weakly to moderately bicolorous, semiglossy, acuminate to long-acuminate at apex, upper surface dark green, lower surface slightly paler, usually drying yellow-brown to reddish brown on both surfaces; margins weakly incised-lobate to usually deeply incised-lobate to within 1--8 cm of midrib, rarely entire and sagittate; apex often acute, sometimes acuminate, very short acuminate or more or less rounded (the acumen tightly inrolled if present, 1--8 mm long), lobed-cordate at base; basal segments pinnatifid, lateral segments entire, sinnuate or the lowermost of the anterior lobe pinnately-lobed with 1--2 lobes on each side, final divisions linear-lanceolate in shape (0.9--2.1 times longer than wide), segment apex obtuse to broadly obtuse; interlobal sinuses 0.7--0.97 the length of the lobes; basal sinus hippocrepiform to obovate or closed, 3--15 cm deep; midrib slightly raised to convex, weakly reddish green-lineate, concolorous to paler than surface above, convex to prominently raised to round-raised below; basal veins 4--5(8) per side, directed into the segments of the posterior lobe, 0--1 free to base, (1)2--4 coalesced to 3 cm long, naked 1--6 cm; posterior rib absent; primary lateral veins 3--8 per side, departing midrib at a 50--60º angle, straight to margin, weakly raised above, raised to convex and paler than surface below; minor veins moderately visible, paler and slightly raised below, arising from both the midrib and primary lateral veins. INFLORESCENCES erect, 1--3(4) per axil; peduncle 2--12 cm long, (3)5--10(19) mm diam.; spathe erect, 11--25 cm long (1.3--6.3 times longer than peduncle), obscurely striate, margins paler; spathe blade cuspidate at apex, pale green to yellowish green, semiglossy, sparsely purplish dotted outside, pink to dull red or pale brownish (post anthesis) inside; spathe tube dark purple-violet or dark green, sometimes tinged purple-violet outside, 4 cm diam., dark purple-violet inside; spadix sessile to weakly stipitate, cylindrical to weakly tapered; staminate portion creamy white, protruding forward at anthesis, pointed at apex, 10--17 cm long; pistillate portion whitish, weakly obovoid, 3.5--5.2 cm long (1 cm shorter on back side), 1.1--1.8 mm diam. at apex, 1.5--1.9 mm diam. at middle, (7)17 mm wide at base; staminate portion 6.3--8.1 cm long; fertile staminate portion tapered, 1--1.9 cm diam. at base, 1.2--1.6 cm diam. at middle, 0.9--1.4 cm diam. ca. 1 cm from apex, broadest at the base, slightly constricted above the base; sterile staminate portion as or slightly broader than the pistillate portion, white with tan ring around apex, 0.7--2 cm diam.; pistils (1.6)4--5(8) mm long, (1)2.8--3.2(5.2) mm diam.; ovary (7)8-locular, (1.6)3.3--4(6.7) mm long, 1.5--3(5.2) mm diam., with axile or sub-basal placentation; locules (0.6)1.9--3.4(6.5) mm long, 0.5--0.8(1) mm diam.; ovule sac 1.8(3.5) mm long; ovules 8 per locule, 1--2-seriate, contained within translucent, gelatinous ovule sac, 0.1--0.3 mm long, longer than funicle; funicle 0.1--0.2 mm long, style 0.3--0.5 mm long, 1.2--3 mm diam., similar to style type B (rarely C); style apex flat to weakly rounded, somtimes domed; stigma usually hemispheroid, sometimes subdiscoid, pink, 1.2--1.5 mm diam., 0.6--0.7 mm high, covering entire style apex; the androecium truncate, oblong, prismatic, margins irregularly 3--5-sided, sometimes weakly scalloped, 1 mm long, (0.7)2.5--2.7 mm diam. at apex; thecae cylindrical, 0.3 mm wide, more or less parallel to one another and contiguous; sterile staminate flowers usually truncate, sometimes clavate or irregularly 5--6-sided, 1.1--2.9 mm long, 0.6--1.8 mm wide. INFRUCTESCENCE 11--17 cm long, 4.5 cm diam.; pistillate spadix 6--8 cm long, 2.5--3.5 cm diam.; berries white, somewhat translucent, 4 per locule, oblong, sticky.


Ranges from Mexico (San Luis Potosí to Chiapas and on both Atlantic and Pacific slopes in Chiapas) to Colombia (Antioquia). It is perhaps more widespread in South America than collections indicate. The plants are very large and difficult to collect and may have been overlooked in other areas.

Distribution Map

  • Native distribution
Found in
  • Northern America Mexico Mexico Gulf
  • Mexico Northeast
  • Mexico Southeast
  • Mexico Southwest
  • Southern America Central America Belize
  • Costa Rica
  • Guatemala
  • Honduras
  • Nicaragua
  • Panamá
  • Western South America Colombia


  • 1 Acevedo-Rodríguez, P. & Strong, M.T. (2012). Catalogue of seed plants of the West Indies. Smithsonian Contributions to Botany 98: 1-1192.
  • 2 Nelson Sutherland, C.H. (2008). Catálogo de las plantes vasculares de Honduras. Espermatofitas: 1-1576. SERNA/Guaymuras, Tegucigalpa, Honduras.
  • 3 Acevedo-Rodríguez, P. & Strong, M.T. (2005). Monocotyledons and Gymnosperms of Puerto Rico and the Virgin Islands. Contributions from the United States National Herbarium 52: 1-415.
  • 4 Hammel, B.E. & al. (2003). Manual de Plantas de Costa Rica 2: 1-694. Missouri Botanical Garden Press, St. Louis.
  • 5 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.
  • 6 Stevens, W.D., Ulloa U., C., Pool, A. & Montiel, O.M. (2001). Flora de Nicaragua. Monographs in Systematic Botany from the Missouri Botanical Garden 85: i-xlii, 1-2666.
  • 7 Croat, T.Bernard A revision of Philodendron subgenus Philodendron (Araceae) for Mexico and Central America Ann. Missouri Bot. Gard. 84, (1997).

 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.
  • A All Rights Reserved
eMonocot. (2010, 1st November). Retrieved Wednesday, 8th February, 2012, from
  • B Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
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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