Cyrtosperma hambalii A.Dearden & A.Hay

Rhizomatous herb to ca. 1 m tall. Stem condensed, subterranean. Leaves ca. 4 bunched together; petiole erect, short, about half the length of the blade, ca. 17 cm long, geniculate in the apical 1 cm, unarmed, basally dark olive brown, apically mid green, olive green mottled olive brown in between, sheathing in the lower 1/3; blade sagittate, held with the posterior lobes erect and the anterior lobe pointing obliquely down, ca. 32 cm long; anterior lobe much shorter than the posterior, narrowly triangular, 8 cm long, ca. 2.5 cm wide at confluence with posterior lobes; posterior lobes rather narrowly elliptic, ca. 23 cm long, ca. 7 cm wide, apically acuminate for 2 cm; anterior and posterior costae very prominent abaxially, impressed adaxially, the anterior costa without primary venation (i.e. main veins equivalent in thickness to secondary veins of posterior costae) with the main vein running sharply towards the leaf tip; posterior costae naked in the sinus for 5-8 mm, with 5 or 6 primary lateral veins on each side diverging at ca. 30°; secondary and tertiary venation forming a loose reticulum. Inflorescence solitary; peduncle much exceeding the petioles, 47 cm long, armed with scattered (distally increasingly concentrated) straight prickles only in the distal 12 cm. Spathe erect, unarmed, with a prominent central ridge on the abaxial side, very long and slender, 53 cm long, 2.2 cm wide level with the spadix, thence tapering, convolute at the base, distally with the margins close together, dark greenish brown with eight green vertical stripes externally, internally blackish. Spadix much shorter than the spathe, cylindric, blunt, 6 cm long, 0.8 cm thick, sessile; flowers hexamerous, ca. 1.5 mm diam.; anthers exserted from the tepals at male anthesis. Fruit unknown.