Philodendron scalarinerve Croat & Grayum
  • Ann. Missouri Bot. Gard. 84: 521 (1997) 

Notes: Distribution: Costa Rica to Ecuador

General Description

Appressed-climbing hemiepiphyte; stems moderately short; leaf scars conspicuous, 2-4 cm wide; internodes 1÷1.5(3) cm long, 1.5÷3.5(4) cm diam., about as long as broad; roots moderately few per node, short, drying dark brown, matte, longitudi-nally ridged; cataphylls moderately thick, to 22 cm long, unribbed to bluntly 1-ribbed, rarely sharply 2-ribbed, drying dark brown, persisting semi-intact, eventually fibrous at upper nodes. LEAVES erectspreading, clustered at or near stem apex; petioles 20÷75 cm long, 0.7÷1.5 cm diam., subterete, stiff, green, obtusely flattened, sulcate adaxially; sheathing 1÷2.5 cm long; geniculum scarcely thicker than petiole, 6÷7.8 cm long slightly paler than petiole; blades oblong-elliptic to narrowly ovate, moderately coriaceous, acuminate at apex (the acumen sometimes inrolled, to 2 mm long), obtuse to sub-cordate at base, 33÷67 cm long, 11.4-40 cm wide (1.2^1 times longer than wide), (0.82-2.11 times longer than petiole), broadest at the middle, margins weakly undulate, upper surface dark green, semiglossy, lower surface much paler, matte to se-miglossy, obscurely dark-punctate at 10 X magnification; midrib convex to narrowly raised, sometimes paler than surface above, convex to thicker than broad and concolorous below; basal veins 1÷ 4 per side, with all free to base; primary lateral veins 5÷18 per side, departing midrib at a 60-75¡ angle, arcuate-ascending to the margins, sunken above; minor veins arising from the midrib only; with scalariiorrn "cross-veins" weakly visible when fresh, conspicuously raised above on drying, barely visible below. INFLORESCENCES spreading, pendent, shorter than leaves, 1 - 4 per axil; peduncle 6 - 20 cm long, subterete, white-streaked near apex, spongy; spathe 16-21.5 cm long (0.6-1.4 limes longer than peduncle), pale green, acuminate at apex, obtuse at base, convolute to about the middle at anthesis; spathe blade semiglossy, white-streaked at apex outside, light green inside; spathe tube matte, white-streaked at base outside, 5 - 7 cm long, 2 - 3.5 cm diam., greenish white inside; spadix sessile, erect, (7.6)9 - 12 cm long, broadest at the base or at the middle or below the middle; pistillate portion light green, slightly tapered above middle or toward both ends, (1.7)2.6-4.3(7.8) cm long, 0.8-1.3 cm diam. at apex, 0.8 - 1.4 cm diam. at middle, 0.9÷1.4 cm wide at base; staminate portion 4.8÷8.7 cm long; fertile staminate portion (9)12 mm diam. at base, (9)12 mm diam. at middle, (6)10 mm diam. ca. 1 cm from apex, broadest at the base, slightly narrower than the pistillate portion, slightly narrower than the sterile portion; sterile staminale portion as broad as the pistillate portion, 1.2 - 1.4 cm diam.; pistils (1.4)2.3-2.8(3.2) mm long, (1)1.4-1.9 mm diam.; ovary 4-6(7-8)-locular, (0.7)1.5-1.8(3) mm long, (1.1)1.5 - 1.9 mm diam., with axile placenta-tion; locales (0.7)1.5-1.8(3) mm long, 0.4-0.6 mm diam.; ovules (10)12-14 per locule, 2-seriale, (0.1)0.3-0.4 mm long, longer than funicle; funicle 0.1 - 0.2(0.3) mm long, adnate to lower part of partition, style 0.5(0.7) mm long, 1.1-1.4(2.2) mm diam., similar to style type B; style apex usually flat, sometimes rounded or domed, with stigma lobes over depressions (if apex is flat or domed); stigma usually lobed, sometimes subdiseoid or truncate, lobed, 0.9-1.2(1.4-1.7) mm diam., (0.1)0.2 - 0.3 mm high, covering entire style apex, inserted on center of style apex, sometimes medially depressed; the androecium truncate, prismatic, sometimes weakly oblong to oblong, margins 4 - 6-sided, sometimes scalloped, (0.6)0.8 - 1.1 mm long, 1 - 1.8 mm diam. at apex; thecae oblong, 0.3 - 0.5 mm wide, ± parallel to one another, contiguous or nearly contiguous; pollen ellipsoidal, <0.1 mm long, <0.1 mm diam.; sterile staminate flowers irregularly 4 - 6-sided, clavate or weakly rounded, blunt, rarely irregularly 35-sided or depressed with a furrow, (0.8-1.2)1.7 mm long, 0.9-1.5(1.5-2 mm) wide.


Tropical wet forest. Premontane rain forest. Tropical Lower Montane rainforest, and Tropical rainforest (Colombia).


Ranges from Costa Rica to Ecuador.

Distribution Map

  • Native distribution
Found in
  • Southern America Central America Costa Rica
  • Panamá
  • Western South America Colombia
  • Ecuador


  • 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 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.
  • 4 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.
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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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