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

Diminutive obligate rheophytic herbs c.  3  cm tall, forming patches up to 25  cm across. Stem creeping and rooting with active portion semi-erect, branching repeatedly, branches 0.5 - 3 cm long × 1.5 - 2 mm in diam., usually bright reddish. Leaves many together, densely arranged along stems, mostly semi-erect, sometimes appressed to substrate; petiole c. 1 cm long × c. 2 mm in diam., adaxially canaliculate, reddish, sheathing at extreme base, wings extended into a very narrowly triangular ligular portion to 1 cm long; blade obovate to elliptic, 4 - 5 cm long × c. 2 cm wide, very stiffly coriaceous, semi-glossy dark green with minute whitish punctulations adaxially, paler yellow-reddish to reddish, less often green abaxially, and supplied with numerous minute reddish punctulations, base cuneate, apex rounded and stiffly apiculate for c. 3 mm, margin somewhat recurved; midrib abaxially and adaxially very prominent, reddish abaxially; primary lateral veins 3 on each side, diverging at c. 60° and running to a marginal vein; interprimary veins alternating with primaries, slightly finer; all other venation obscure. Inflorescence solitary; peduncle exceeding petioles, 2 - 3  cm long, con spicuously longitudinally sulcate, reddish, colour in tensifying along ridges. Spathe broadly ovate, not constricted, c. 2 cm long; lower spathe funnel-form, pale bright green, persistent; limb gaping at pistillate anthesis, opening via a wide slit as far at lower spathe, then caducous, white with a faint pink flush, apiculate for c. 2 mm, apiculum deep reddish brown. Spadix c. 1 cm long; pistillate zone c. 1.5 mm long × c. 1.5 mm in diam., with 2 or 3 incomplete spirals of pistils; pistils rhombic-globose, c. 0.5 mm in diam., lime-green; stigma sessile, umbonate, slightly impressed, c. ½ diameter of ovary, papillate at anthesis; pistillodes absent; interstice with 1 row of scale-like staminodes, these c. 1 mm long × c.  1.2  mm wide, margin somewhat thickened, glossy white; staminate zone c. 2.5 mm long × c. 2.5 mm in diam., consisting of 2 or 3 rather irregular rows of flowers; staminate flowers ascending, creamy white; stamen c. 1 mm across; filament short, slender; connective strapshaped; thecae inserted ventrally, ellipsoid, c. 1 mm long × c. 0.5 mm wide, smooth; thecae horns c. ¼ length of associated theca, setaceous, spreading; appendix bluntly ellipsoid, c. 5 mm long × 2.5 - 3 mm in diam., cream; appendix staminodes well-defined, columnar, regularly polygonal, truncate, c. 1 mm in diam., upper surface somewhat brain-like. Infructescence not seen.