Bucephalandra kerangas S. Y. Wong & P. C. Boyce

Small solitary obligate rheophytic herbs to c. 13 cm tall, but in exposed situations only c. ½ this height. Stem creeping and rooting, c. 1 cm in diam., with active portion sub-erect. Leaves c. 10 together, semi-erect; petiole 2 - 4 cm long × c. 2 mm in diam., adaxially canaliculate, conspicuously longitudinally ribbed, dark reddish brown, sheathing at extreme base, wings extended into a very narrowly triangular ligular portion to 4 cm long; blade lanceolate, 6 - 12 cm long × 1 - 4 cm wide, stiffly to moderately coriaceous, semi-glossy deep green adaxially, paler and yellowish pink to reddish green abaxially, base cuneate, apex acute, apiculate for c. 2.5 mm, straight and somewhat reflexed, especially in plants from exposed situations; midrib abaxially and adaxially prominent, abaxially with at least basal 1/3 ridged; primary lateral and interprimary veins not differentiated, together totalling c. 4 per side, diverging at c. 30° and running to a marginal vein; secondary venation adaxially ± obscure, abaxially fine; tertiary venation adaxially obscure, forming a faint tessellate reticulum. Inflorescence solitary; peduncle exceeding petioles, 5 - 6 cm long × c. 1.5 mm in diam., conspicuously longitudinally sulcate, reddish green with ridges darker red. Spathe broadly ellipsoid, not constricted, c. 3.7 cm long; lower spathe funnel-form, green, persistent; limb gaping, then caducous, white shading to green at junction with lower persistent spathe, limb acuminate for c. 1 cm and apiculate for c. 4 mm, apiculum green. Spadix 2 - 2.5  cm long; pistillate zone c.  5  mm long × c. 3 mm in diam., with c. 3 spirals of pistils; pistils rhombic-globose, c. 0.5 mm in diam., bright green; stigma sessile, umbonate, c. ½ diameter of ovary, producing a conspicuous meniscus-like droplet at anthesis, later (post-anthesis) sunken centrally; pistillodes 2 - 4 at base of pistillate zone, tongue-shaped, c. 0.5 mm long and wide, waxy white; interstice with 2 rows of scale-like staminodes, these c. 2 mm long × 1.5 mm wide, ventrally gibbose, margin spathulate, basally green, apically white, erect during pistillate anthesis, reflexing prior to staminate anthesis, later (post-anthesis) becoming green and persisting to cover developing fruit; staminate zone c. 5 mm long × c. 4 mm in diam., consisting of c. 4 rows of flowers; staminate flowers ascending to display almost entire ventral surface, creamy yellow to pinkish cream; stamen comparatively large, c. 2 mm long; filament small, stout; connective strap-shaped; thecae inserted ventrally, ellipsoid, c. 1 mm long × c. 0.5 mm wide, smooth; thecae horns c. ¼ length of associated theca, setaceous, outward-pointing; appendix bullet-shaped, base abruptly truncate at junction with staminate flower zone, 1 - 1.5 cm long × c. 5 mm in diam., cream; appendix staminodes tending to form groups of 3 or 4, obpyramidal, tops irregularly polygonal, truncate, 0.5 - 1 mm in diam., smooth and somewhat glossy, cream. Infructescences not seen.