Philodendron adamantinum Mart. ex Schott

STEM: decumbent to erect, up to 1.5 m tall, 2.5 cm diam.; adventitious roots extending in all directions to 10m or more; internodes usually only 0.1 - 0.3 mm long, shorter than prophyll scars, sometimes longer, green, ± glossy; prophyll scars 0.7 - 1 cm long, resembling internodes, green near stem apex, becoming pale greyish brown below and transversely repose; intravaginal squamules minute, 1 mm long or less, not persistent, narrow, aluminate, in rows of 6 - 12 on either side and below foliage leaf scars; foliage leaf scars 1 - 2 cm wide, elliptic. LEAF: prophyll olivaceous green; petiole 12 - 24( - 50) cm long, 0.6 cm diam. at apex, sulcate adaxially with sharply angled margins, rounded abaxially, sheath 2.9 - 6.7 cm long; leaf blade pinnatifid, broadly ovate, subcircular or circular in outline with apex rounded to indented and with cordate base, overall length 17 - 33 cm, overall width 17 - 30.5 cm, upper surface dark subglossy green, lower surface paler green and glossy; anterior division 11 - 21 cm long, 17 - 30 cm wide, apical lobe equalling or shorter than adjacent primary lateral lobes, oblong to triangular, acute to emarginate, mucronate, primary lateral lobes 3- 4( - 5) per side, length in basal part of division 9 - 17.5 cm, shorter towards division apex, 1.4 - 3.7(- 7.4) cm wide, linear to oblanceolate in outline, often arcuate either acroscopically or basiscopically, apex acute to rounded, sometimes emarginate, margins mostly entire or repaid, basal primary lateral lobes often with few, weakly developed (rarely well-developed), obtuse to rounded (rarely oblong-acute) secondary lobes on either side, main sinuses ending 0.2 - 2.2 cm from midrib, becoming progressively deeper towards base of division, primary lateral veins 3 - 1( - 5) per side, arising at angle of 30- 70( -80º) to midrib, slightly paler than blade on both surfaces, sometimes pink-tinged on lower surface near petiole insertion; posterior divisions 5- 11.5 cm long, 0.3 - 0.43 x overall blade length, 8.5 - 14.7 cm wide, basal ribs denuded for 0.2 - 1.3 cm, primary acroscopic lobes 1 - 2( - 3), sinuses extending to 0.2 - 1.4. cm from basal rib, rarely with weak secondary lobes, primary basiscopic lobes 1 - 2(- 4), sinuses extending to 0.5 - 2.8 cm from basal rib. INFLORESCENCE: peduncle 2 - 5 cm long, 0.5 - 0.8 cm diam.; spathe 6.4- 11.4, cm long, 1.5 - 3.4 cm diam. at middle, recurrent for 1 - 1.7 cm, green on outer surface, inner surface creamy white; spadix 5.5 - 12.5 cm long overall, fertile male zone 2.8 - 4.6 cm long, 0.85 - 1.3 cm diam, often somewhat thicker and slightly longer than sterile male zone, sterile male zone 2.4 - 4.4 cm long, 0.6 - 1.4 cm diam. , female zone 1.4 - 3.4 cm long, 1.1 - 1.6 cm diam. FLOWERS: stamens 2.5 - 4 mm long, 0.3 - 1 mm diam. at apex, oblong or slightly narrowing towards base, subprismatic; staminodes 2.3 - 3.5 mm long, 0.8 - 1.3 mm diam. at apex, tapering towards base, subprismatic, 5 per flower; gynoecium 1.7 - 2 mm long, cylindric, ovary c. 2 mm diam. , cylindric, locules 4 - 8 per Ovary, ovules 3- 7 per locule, inserted in lower half of ovary axis, lowermost ovules with short Cubicles, upper ovules with progressively longer funicles, style body lacking, compitum very deep, penetrating to halfway down ovary axis, lacking raphide cells around basal region, style crown as wide as ovary and not narrowed basally, style lobes abundantly tanniniferous, central dome lacking, stylar canals lacking, compitum opening directly into locales halfway down ovary axis, stigma covering entire style crown or absent on dorsal area of style lobes, contiguous with adjacent stigmas, tannin hairs lacking. INFRUCTESCENCE: Berries (immature) 0.9 cm long, 0.6 - 0.7 cm diam., oblong; seeds 2.5 mm long, 1 - 1.3 mm diam., ovoid, raphe and funicle fleshy and arillate, testa variably thickened, sarcotestate at each end of seed, less so in middle, containing oily droplets.