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

Small obligate rheophytic herbs to 20 cm tall. Stem erect, older plants with stem shortly creeping and with active portion sub-erect, c. 1 cm in diam. Leaves many together; petiole 6 - 8 cm long × c. 1.5 mm in diam., weakly longitudinally ridged, adaxially canaliculate, reddish green, sheathing at extreme base, wings extended into a very narrowly triangular ligular portion to 4 cm long; blade lanceolate, somewhat oblique, 9 - 11 cm long × 1 - 1.5 cm wide, coriaceous, matte dark green adaxially, lighter green abaxially, base sub-cuneate, apex acute to acuminate, apiculate for c. 1.5 mm, margin undulate; midrib abaxially and adaxially prominent, tending to be reddish abaxially; primary lateral veins c. 3 on each side, diverging at c. 40° and running to a marginal vein; interprimary veins very faint; secondary venation adaxially ± obscure, abaxially somewhat raised; tertiary venation obscure. Inflorescence solitary; peduncle exceeding petioles, 9 - 12 cm long, stout, c. 4 mm in diam., somewhat angled and weakly longitudinally sulcate, bright reddish shading to green at lower spathe. Spathe oblong-ovate, not constricted, 5 - 6  cm long; lower spathe narrowly funnel-form, green, persistent; limb inflating at pistillate anthesis and gaping along most of its length, opening wide at staminate anthesis, then caducous, ivory, apiculate for c. 2 mm, apiculum green. Spadix 4 - 5 cm long; pistillate zone 5 - 6 mm long × c. 3 mm in diam., with 2 - 5 spirals of pistils; pistils rhombic-globose, c. 0.6 mm in diam., pale yellow-green; stigma sessile, umbonate, c. ½ diameter of ovary, slightly depressed, papillate at anthesis, later (post-anthesis) sunken centrally; pistillodes 2 - 4 at base of pistillate zone, tongue-like with a clavate tip, c. 0.3 mm long, white with tip yellow; interstice with 2 or 3 rows of scale-like staminodes, these c. 3 mm long × c. 1 mm wide, bases thickened, staminodes initially erect, then spreading, initially white, later (post-anthesis) becoming green and persisting to cover developing fruit; staminate zone 8 - 11 mm long × 4 - 6 mm in diam., consisting of 5 - 11 rows of flowers; staminate flowers initially spreading, reflexing at staminate anthesis to present thecae horns, creamy white; stamen large, c. 2 mm across; filament slender; connective semi-terete, dorsally rounded, ventrally flattened; thecae inserted ventrally, ellipsoid, c. 1 mm long × c. 0.5 mm wide, smooth; thecae horns very short, c. 0.2 mm long, upward-turned; appendix bluntly cylindrical to slightly fusiform, 2 - 3 cm long × c. 6 mm in diam., cream; appendix staminodes obpyramidal, rather regularly polygonal, lowermost staminodes c. 2 mm in in diam., uppermost c. ½ this size, tops truncate, smooth. Fruiting spathe narrowly funnel-form, c. 1 cm in diam.; fruits and seeds not seen.