STEM. erect, sometimes branching 0.5-2 m tall, 6-8 cm thick; adventitious roots rarely seen above ground level, with prominent lenticels; internodes 1-10 mm long, green when young, turning silvery gray; prophyll scars 2-7 mm long, concolorous with the internodes; intravaginal squamules not persistent; foliage leaf scars rounded to transverse elliptic, 3-4.6 cm long, 5-6.5 cm wide, concolorous with true internodes.
LEAF. 8-10 per crown; prophyll 35-49 cm long, 12-14 cm wide at base; petiole 40-45 cm long, clear green with darker longitudinal stripes, subequaling the leaf blade, 1-1.2 cm at apex, sulcate adaxially with sharply angled margins; leaf blade ovate to triangular in outline, upper surface dark green, semi-glossy, margins repand to sinuately lobed, overall length 43-45 cm, overall width 39-43 cm, usually wider below petiole attachment; anterior division 32-34 cm long, 39-41 cm wide, apex acute to shortly acuminate; primary lateral lobes 3-4 per side, subtriangular to rounded, somewhat oblique, basal primary lateral lobes 2-5.5 cm long , 5-6 cm wide, shorter towards apex; primary lateral veins 4 per side, regularly spaced, paler than lamina in both surfaces, arising at an angle of 50-60 degrees; posterior divisions 10-14 cm long, 0.3-0.4 x overall blade length, 39-43 cm wide, basal ribs denuded for 3.5-4 cm, tip rounded, primary acroscopic lobes 2-3, primary basioscopic lobes 2-3, much shallower than acroscopic lobes, basioscopic area of lamina well-developed, sinus between posterior divisions parabolic.
INFLORESCENCE. peduncle 8-10 cm long, 2-25 cm diameter at apex; spathe 20-22 cm long, 5-5.5 diameter at middle, dark glossy green on outer surface, white on inner surface; spadix 16-18.5 cm long, fertile male zone 6 cm long, 2.5 cm diameter, subcylindric, sterile male zone 8 cm, usually longer than fertile male zone, 4 cm diameter, thicker basally, female zone 4.5 cm long, 2.5 cm diameter.
FLOWERS. stamens 5-8 mm long, 1-1.2 mm diameter at apex, staminoes 5-7 mm long, longest at base of sterile zone, at apex 1-1.5 mm diameter, clavate, usually flattened, tapering gradually and then abruptly to base; gynoecium 4-5 mm long, ovary cylindric, 2-2.5 mm diameter, locules 4-7 per ovary, ovules 3-4 per locule, inserted from base to upper third of ovary axis, style crown strongly lobed, style body slightly narrower than the ovary, central dome absent, stigma 2 mm diameter.
Oleh: E.G. Gonçalves and E.R. Salviani
Dari: E.G. Gonçalves and E.R. Salviani (2002). New species and changing concepts of Thaumatophyllum subgenus Meconostigma (Araceae). Aroideana 25: 2-15