The paper is based on the materials collected by the first author from different forest areas of the country during different field trips made from 2000 to 2010. The specimens, after study, have been preserved in Bangladesh National Herbarium (DACB). Identifications were confirmed by consulting Engler (1911), Engler and Krause (1920), Nicolson (1987), Hetterscheid (1994), Noltie (1994), Hetterscheid and Ittenbach (1996) and Rodriguez and Strong (2005). Description of each species, based on examined specimens, has been prepared. Photographs from fresh specimens have been taken. Each species is cited with current nomenclature, commonly known synonyms, specimen citation, ecology and geographical distribution. Tuber subglobose, 11 cm in diam., 10 cm in height. Leaf solitary, lamina 65 cm in diam., leaflets elliptic-lanceolate, acuminate, 2-20 cm long, 2-5 cm in diam., marginal surface slightly undulate, dark green above and paler below; petiole 120 cm long, 4 cm in diam. at base and tapering towards the tip, smooth, cream colour with bottle-green mottlings and paler towards the tip. Peduncle 98 cm long, 2.5 cm in diam., smooth, cream with bottle-green mottlings, covered by cataphylls; cataphyll 23 cm long, 7 cm in diam. Spathe erect, cymbiform, not differentiated into tube and limb, 33 cm long, 10.5 cm in diam. at base, with cream coloured small wart at the base. Spadix shorter than spathe, 29.5 cm long. Male flowers in a zone 8 cm long, 2 cm in diam.; appendix elongate fusiform, top acute or slightly rounded, base constricted, 17 cm long, 3 cm in diam., at the middle and tapering towards the tip, light yellow; stamens 3-5, c 2 mm long, 1.5 mm in diam.; anthers truncate. Female flowers below in a zone, cylindric, 4 cm long, 2 cm in diam.; no sterile region between male and female zones. Ovary sub-globose, 1 mm long, 2 mm in diam., greenish, unilocular with a single basal anatropous ovule; style very short, 0.5 mm long; stigma 1.5-2.5 mm in diam., 0.5-1.0 mm long, inconspicuously 4-lobed with a bigger median lobe, yellowish to brownish. Flowering time: June. Tuber globose, 9 cm in diam., 6.5 cm in height, no branching. Leaf solitary, lamina 60-80 cm in diam.; leaflets elliptic-lanceolate, acuminate, base decurrent, 2-25 cm long, 1-3 cm in diam., upper side green, lower side paler green; petiole smooth, 20-120 cm long, 1-2 cm in diam., dark rich reddish green with a few small dark elongated or paler green spots, the intensity of colours and the extension of the pattern variable. Peduncle 34-45 cm long, 1.3 cm in diam. at base, smooth, dark rich reddish green with a few small dark elongated green spots near the base and at the middle of the peduncle, covered by about two cataphylls, each cataphyll 3.0-16.5 cm long and 2 cm in diam. at base, outside brown with green spots, inside white. Herb with milky sap, erect, 2 m tall, mature plants with a thick, starchy stem, up to 1.5 m long, with numerous leaf scars and aerial roots at the base. Leaves several, blades 40-70 × 30-50 cm, simple, cordate-sagittate, chartaceous, upper surface dark green, lower surface greyish green, margin undulate; petiole erect, 45-100 cm long, green, sheathing below. Inflorescences 1-3, axillary. Peduncle up to 30 cm long. Spathe constricted, 25-31 cm long, the tube 8-13 cm long, thickened, oblong-ovoid, both sides deep pink, persistent; the blade erect, concave, adaxially cream to white, abaxially pink, shortly acuminate at apex, deciduous. Spadix slightly shorter than the spathe, 30 cm long. Male zone light pink, 17 cm long, elongated; synandria hexagonal, truncate, consisted of 6-8 united stamens. Female zone yellowish, 3.0-5.5 cm long, cylindrical. Ovary ovoid, 2.2 × 2.0 mm, cream, 2-4 locular with many ovules, anatropous; stylar region broader than ovary, usually discoid-thickened; stigma hemispheric-discoid, 2-4 lobed, yellow, narrower than style; sterile zone pink, 7.5 cm long, conical. Berry cylindrical, many-seeded. Seeds ovoid. Flowering time: May.