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

Small obligate rheophytic herbs c. 18 cm tall. Stem erect, occasionally somewhat decumbent and rooting with active portion sub-erect, c. 1 cm in diam. Leaves many together, erect-arching; petiole 6 - 9 cm long × c. 2 mm in diam., weakly carinate, very deep red, sheathing at extreme base, wings extended into a narrowly triangular ligular portion c. 3 cm long; blade lanceolate-elliptic, sometimes slightly oblique and/or weakly falcate, 7 - 9 cm long × 1.5 - 2 cm wide, coriaceous, semi-glossy dark green adaxially, pale yellow green abaxially, base sub-cuneate, apex acuminate and apiculate for c. 3 mm, margin undulate; midrib abaxially prominent, red, adaxially slightly raised; primary lateral veins c. 4 on each side, diverging at c. 30° and running to a rather conspicuous marginal vein; interprimary veins alternating with primaries, very much finer but darker than blade; secondary venation adaxially obscure, abaxially forming a faint reticulate pattern; tertiary venation obscure. Inflorescence solitary, or up to three together separated by prophylls; peduncle exceeding petioles, 5 - 7 cm long × c. 2 mm in diam. (on average), longitudinally sulcate, pale green with numerous bright reddish speckles, these particularly concentrated in sulcae, giving peduncle a candy-striped appearance. Spathe oblong-ovate, not constricted, 4 - 5 cm long; lower spathe initially narrowly funnel-form, later (staminate anthesis) flaring, medium semi-glossy green, persistent; limb slightly inflating and gaping distally at pistillate anthesis, opening widely almost to persistent lower spathe during staminate anthesis, caducous during late or post-staminate anthesis, with margins recurving, and limb often retaining a slender connection to lower spathe, ivory, acuminate for c. 4 mm and apiculate for c. 1.5 mm, apiculum dull orange. Spadix 2.5 - 3 cm long; pistillate zone sessile, c. ½ width of remainder of spadix; 3 - 5 mm long × c. 3 mm in diam., with 3 - 5 spirals of pistils; pistils very closely appressed, rhombic-cylindric, c. 0.5 mm in diam., pale creamy yellow; stigma sessile, button-like, c. ½ diameter of ovary, papillate at anthesis; pistillodes absent; interstice with 1 - 3 somewhat incomplete rows of scale-like staminodes, these c. 2 mm long × 1.8 mm wide, margin thickened, staminodes initially erect (pistillate anthesis), then during staminate anthesis reflexing until sub-perpendicular with spadix axis, with body of staminode depressed and tips ascending, initially greenish white, later (post-anthesis) becoming green and persisting to cover developing fruit; staminate zone 6 - 8 mm long × c. 6 mm in diam., consisting of 3 - 5 rows of flowers; staminate flowers cream; stamen comparatively large, c. 1 mm tall, c. 0.7 mm wide; filament very short; connective tetrahedral, with one side facing outward and upward; thecae inserted ventrally almost completely immersed into connective, individually very narrowly ellipsoid, c. 1 mm long × c. 0.3 mm wide, bright orange; thecae horns very short, barely 0.2 mm long, nipple-like, downward-directed throughout anthesis; appendix ± tapering-cylindrical, 1.5 - 2 cm long × c. 5 mm in diam., cream to pale yellow; appendix staminodes columnar, densely arranged, trapezoidal, smooth, lowermost ones largest, c. 2 mm in diam., uppermost ones c. ? this size, with terminal ones irregularly polygonal, c. 0.5 mm in diam. Fruiting spathes and infructescences not seen.