Philodendron tysonii Croat
  • Ann. Missouri Bot. Gard. 84: 549 (1997) 

Notes: Distribution: Panama

General Description

Usually hemiepiphytic, appressed-climber, sometimes terrestrial; internodes short, stout, semiglossy, smooth, 2--6 cm long, 3.5--4 cm diam., dark green; roots elongate, fine, branched; cataphylls (10)21--33 cm long, unribbed to weakly 1-ribbed, sometimes sharply 2-ribbed near base and unribbed near apex, frequently reddish, frequently striate, emarginate at apex, persisting semi-intact at upper nodes, eventually deciduous, emarginate at apex. LEAVES: Petioles 39--90 cm long, 8--15 mm diam., terete to subterete, surface densely pale-striate, glossy; sheath 10.5--11 cm long; blades ovate, coriaceous to moderately coriaceous, glossy to semiglossy, conspicuously bicolorous, acuminate at apex (the acumen sometimes inrolled and twisted), cordate at base, 32--70 cm long, 24--50 cm wide (1--1.8 times longer than wide and averaging 1.4 times), (0.4--1.1 times longer than petiole), averaging about 3/4 as long as petiole, upper surface dark green, drying dark brown to blackish brown, lower surface slightly paler, drying dark yellow-brown to greenish brown; anterior lobe 25--52.5 cm long, 20--50 cm wide (2--4.8 times longer than than posterior lobes); posterior lobes broadly rounded to broadly obtuse, 8--20 cm long, 11--22 cm wide; sinus parabolic, sometimes spatulate, (3)4--12 cm deep; midrib broadly convex to almost flat, conspicuously paler than surface above, convex to bluntly acute, darker than surface below; basal veins 5--9 per side, with (0)1(2) free to base, numbers 3--4 coalesced 1.5--3 cm; posterior rib usually scarely or not at all naked, rarely naked for 3 cm; primary lateral veins 4--10 per side, departing midrib at a 60--70E angle, moderately straight to the margins, narrowly sunken above, convex and somewhat paler than surface below; interprimary veins sunken, usually concolorous above, raised, darker than surface below; minor veins moderately distinct below, arising from both the midrib and primary lateral veins. INFLORESCENCES 4--5 per axil; peduncle 3--12 cm long, 3--8(11) mm diam., green, finely striate; spathe 11.5--19 cm long (1.5--4.5 times longer than peduncle); spathe blade green to white, lightly to heavily tinged maroon or reddish, finely striate-speckled, margins clear outside, white to pale green inside; spathe tube tinged maroon or reddish, finely striate-speckled outside, 4.5--10 cm long, dark maroon, suffused into blade inside, weakly constricted above the tube; spadix white throughout, 10.7--15.6 cm long; pistillate portion 3.4--5.2 cm long in front, 2.4--3.1 cm long in back, broadest midway and gradually tapered toward both ends, 1.2 cm diam. at apex, 1.2--1.4 cm diam. at middle; staminate portion 7.7--9.4 cm long; fertile staminate portion white, barely constricted above the sterile staminate portion, barely tapered toward apex, 1--1.2 cm diam. at base, 1--1.2 cm diam. at middle, 6--7 mm diam. ca. 1 cm from apex; sterile staminate portion, 9--10 mm diam.; pistils 1.5--2.7 mm long, 0.8-1.6 mm diam., white; ovary (5)6--8(9)-locular, with sub-basal placenetation; locules (0.8)1.1--1.3 mm long, 0.3--0.6 mm diam.; ovules (4)5--7 per locule, (0.1)0.3--0.4 mm long, 2-seriate, contained within transparent ovule sac; style similar to style type B; stigma 0.8--1.2 mm diam., 0.2--0.3 mm high. INFRUCTESCENCE with pistillate spadix 6.5 cm long, 4 cm diam.


Premontane rain forest and Tropical Lower Montane rain forest life zones.


Known only from Panama, but is expected to be found in the Cordillera de Talamanca of Costa Rica.

Distribution Map

  • Native distribution
Found in
  • Southern America Central America Panamá


  • 1 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.
  • 2 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
Global Biodiversity Information Facility
  • B All Rights Reserved
eMonocot. (2010, 1st November). Retrieved Wednesday, 8th February, 2012, from
  • C 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
  • D See 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.