Philodendron thalassicum Croat & Grayum
  • Ann. Missouri Bot. Gard. 84: 541 (1997) 

Notes: Distribution: C. Costa Rica to W. Panama

General Description

Terrestrial or hemiepiphytic, growing to 4 m high in trees; stem appressed-climbing; internodes short, 2--4 cm diam., dark green, semiglossy, drying light yellowish brown, epidermis fragmented, reddish brown; roots several per node, <30 cm long, drying dark brown with epidermis ridged and splitting; cataphylls soft, 14--46 cm long, sharply 2-ribbed (ribs low), green or tinged pink when young to reddish brown or brown, drying brownish, persisting semi-intact, soon dilacerating. LEAVES: Petioles 38--109 cm long, 2--14 mm diam., D-shaped, firm, flexible, sometimes with low, medial rib adaxially and with adaxial margins obtuse to rounded, medium green, weakly glossy, faintly to conspicuously dark- or striate-lineate, drying yellow-brown, dark brown to sometimes blackened; blades triangular-sagittate to ovate-triangular, subcoriaceous, conspicuously bicolorous, acuminate to long-acuminate at apex, sagittate at base, 42--77 cm long, 16--52 cm wide (0.8--1.8 times longer than wide), (0.6--1.4 times longer than petiole), usually shorter than petiole (averaging 0.9 times as long), upper surface dark green, matte or weakly glossy, sometimes glistening, drying dark brown, lower surface much paler (forming an areolate pattern on high magnification) and matte, often bluish green to whitish, drying bluish green if triangular-sagittate or yellowish brown if ovate-triangular, glaucous; anterior lobe 28--58 cm long, 18--51 cm wide (1.6--3.3 times longer than posterior lobes); posterior lobesbroadly obtuse to narrowly rounded, 13.5--25 cm long, 10--23 cm wide, rounded; sinus spathulate to parabolic, 9--12 cm deep; midrib broadly sunken to flat above, slightly paler, obtusely triangular and darker below; basal veins 5--11 per side, with 1--2(3) free to base, with a few veins coalesced for 5--9 cm; posterior rib prominently naked to 2.5--5 cm; primary lateral veins (4)12--18 per side, departing midrib at a 50--60E angle, weakly arcuate to more or less straight to the margins, C-shaped to sunken and slightly paler above, convex and concolorous below; minor veins conspicuous, darker than surface to obscure below, arising from both the midrib and primary lateral veins. INFLORESCENCES more or less erect, 1--3 per axil; peduncle 3--14 cm long, 2--9 mm diam., coarsely white-striate; spathe 11--20 cm long, (1.15--2.8(4.7) times longer than peduncle); spathe blade white to cream and densely short-lineate outside, greenish white inside; spathe tube pale green and short-lineate outside, 3--7 cm long, greenish to white, sometimes faintly pinkish inside; spadix sessile to weakly stipitate; 12.8--16.6 cm long; pistillate portion 5.5 cm long in front, 3--3.5 cm long in back, 1.6--2 cm diam. midway, 1.5--1.6 cm diam. ca. 1 cm from apex; staminate portion 6.8--9.4 cm long; fertile staminate portion tapered toward apex, constricted (to 8--10 mm, 1.5--2 cm above base of sterile section) above sterile male flowers, 1 cm diam. at base, 1--1.6 cm diam. at middle, 5--7 mm diam. near apex; sterile staminate portion 1--1.7 cm diam. at base, 1 cm diam. at apex; pistils 2.8--3.8(6.2) mm long, 1.2 mm diam.; ovary (4)5--7(8)-locular, 1.7--2.3 mm diam., with axile placentation, wall sometimes embedded with angular crystal-like particles; locules 2.7(4.9) mm long, 0.5--0.6 mm diam.; ovules ca. 16--22 per locule, 2-seriate, 0.2--0.4 mm long, longer than funicle; funicle 0.1--0.2 mm long, adnate to lower part of partition; stigma lobed; style 1.3--2.1 mm diam., similar to style type B; style apex sloping to somewhat rounded, drying granular with an acute, turned up margin; stylar pores thickened, usually fused with the crown, sometimes free or nearly so, each with its own fringe of stigmatic papillae; style boss broad, shallow to quite shallow; the androecium truncate, prismatic, oblong, margins irregularly 4--6-sided, 0.9--1.2 mm long; thecae oblong, more or less parallel to one another; sterile staminate flowers prismatic to weakly clavate, irregularly 5--6-sided, 1.2--1.6 mm long. INFRUCTESCENCE with berries whitish (maturing).


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


Ranges from central Costa Rica to western Panama (Chiriquí).

Distribution Map

  • Native distribution
Found in
  • Southern America Central America Costa Rica
  • Panamá


  • 1 Hammel, B.E. & al. (2003). Manual de Plantas de Costa Rica 2: 1-694. Missouri Botanical Garden Press, St. Louis.
  • 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 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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