Philodendron jonkerorum Croat
  • Willdenowia 40: 145 (2010) 

Notes: Distribution: Suriname

General Description

Epipetric; stems erect; internodes moderately short; cataphylls not seen. Leaves with petiole 48-49 cm long, drying dark brown, 5 mm diam. midway, sheathed to about 10 cm at base (at least when subtending an inflorescence), green-verrucose in lower 1/3, becoming more conspicuously club-shaped scaly toward the apex (these somewhat denser toward the apex); blade ovate-cordate, 34 cm long, 28-30 cm wide, subcoriaceous, acuminate at apex, conspicuously cordate and broadest at the base, dark green and matte above, moderately paler and semiglossy below, drying grey-green above, greenish brown below; sinus broadly hippocrepiform, to 8.5 cm deep; anterior lobe 26.5 cm long, nearly straight along most of its margin; posterior lobes 12.5-14.5 cm long, 9-10 cm wide; midrib flattened, drying somewhat darker than surface above, narrowly rounded and drying much darker than the surface below; basal veins 7-8 per side, lst-2nd free to base, the 3rd almost free, the 5th-6th coalesced 4.3 cm, drying narrowly rounded and much darker than the surface; posterior rib naked throughout most of its length; primary lateral veins 4-5 per side, arising at a 30-45o angle, drying dark brown, darker than the surface; minor veins drying moderate ly distinct, in part wrinkled. Inflorescence with a peduncle 5-5.5 cm long; spathe 14-19.5 cm long, green outside, blade yellowish inside, tube red inside; spadix with pistillate portion 8.3 cm long, 2 cm diam. midway, 1.2 cm diam. at apex; staminate portion 8-8.2 cm long, 9-10 mm diam. at base, to 1.2 cm diam. in upper 1/3; pistils 3.5 mm long, 2.5 mm diam.; locules 5; ovules 15-20 per locule, 1 mm long, 0.2 mm diam.; placenta tion axile, the ovules dispersed along the entire length of the locule.

Diagnostic Description

Planta epipetrica; internodia brevia; folia petiolo 48 -49 cm longo, lamina ovato-cordata, 34 cm longa, 28 30 cm lata, lobulis posterioribus 12.5-14.5 cm longis, nervis basalibus 7-8 utroque, nervis lateralibus primariis 4-5 utroque; pedunculus 5-5.5 cm longus; spatha 14 19.5 cm longa, viridis extus, lamina lutea intus, tubo rubro intus; spadix pistillatus, 8.3 cm longus; ovula 15-20 in quoque loculo.


Philodendron jonkerorum is endemic to Suriname and is known only from the type locality from the Emmaketan Mountains found at an elevation of 350 m in a Premon tane wet forest life zone.

Distribution Map

  • Native distribution
Found in
  • Southern America Northern South America Suriname


 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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