Apoballis sagittifolia (Alderw.) S.Y.Wong & P.C.Boyce

Herb to c. 60 cm tall. Stem ?erect, ?pleionanthic (specimen fragmentary), c. 1.5 cm diam. Leaves few together; petiole ?30–35 cm long (see Alderwerelt, loc. cit.), minutely pubescent, sheathing in the lower 1⁄5; wings of sheath fully attached, ?degrading, tapering; blade broadly lanceolato-sagittate, 25 cm long × 6 cm wide, the base divided into two rather narrowly triangular, apically acutely rounded posterior lobes c. 4 cm long, the apex acute and acuminate for c. 3 cm; midrib somewhat prominent abaxially and adaxially, abaxially pubescent like the petiole, with c. 18 abaxially sparsely pubescent primary lateral veins on each side irregularly and infrequently (within a leaf) alternating with lesser interprimaries, diverging at c. 80–100° and acropetally deflected more or less abruptly and running into a rather conspicuous intramarginal vein c. 1.5 mm from the margin, the primary veins of the posterior lobes united into posterior costae from which they emerge at a low angle thence abruptly acropetally reflexed; secondary venation arising from the midrib and sometimes from some distance along the primary veins, adaxially obscure, faint and fine abaxially; tertiary venation obscure. Inflorescence ?solitary; peduncle c. 7.5 cm long (see Alderwerelt). Spathe c. 9 cm long; lower spathe more or less obovoid, c. 1.75 cm long; limb lanceolate, clasping the spadix (but inflorescence immature), c. 7.25 cm long, ?semi-persistent. Spadix (immature and incomplete) white; female zone oblong-ellipsoid, c. 1 cm long; ovary oblong; stigma discoid, rotund, broad; interpistillar staminodes absent from among the pistils, concentrated at the top of the female zone; sterile interstice c. 5 mm long, with scattered very short apically flattened and rotund staminodes; male zone and appendix unknown; infructescence unknown.