Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592
CATE Araceae, 17 Dec 2011. araceae.e-monocot.org
Malesia: Borneo (Sarawak and West Kalimantan)
Herb 25-40 cm tall. Stem condensed, erect, c. 1-4 cm long, 1-1.3 cm diam. Leaves several together; petiole 5-14 cm long, 2-4 mm diam., sheathing only at the extreme base, the wings extended into a very narrowly triangular ligular portion 5.5-6.5 cm long; blade coriaceous, dark green adaxially, paler abaxially, narrowly elliptic to broadly oblanceolate, 10-21 cm long × 2-6 cm wide, the base cuneate, the apex acute, acuminate for c. 2 cm and apiculate for 0.5-1 mm; midrib abaxially prominent, adaxially somewhat impressed, with c. 3 very weak (hardly bigger than secondary veins) primary lateral veins on each side, diverging at c. 30-45°; secondary venation very faint; tertiary venation obscure. Inflorescence solitary; peduncle 5-24 cm long, subequalling to exceeding the petioles. Spathe more or less broadly ovate, not constricted, 4.5-6.5 cm long, green, obconic and persistent in the lower c. 1.5 cm, the remainder gaping, white, caducous. Spadix subcylindric 3-3.5 cm long, 0.5-0.6 cm diam.; female zone 0.8-1.2 cm long, adnate to the spathe on the dorsal side; pistils crowded; ovary globose, c. 1 mm diam., with basal placentation and a naked intrusive apical placenta; stigma sessile, discoid, centrally impressed, barely papillate, as wide as the ovary; interpistillar staminodes absent from among the pistils, a few at the base of the female zone along the spathe/spadix adnation, slightly clavate, shortly stipitate, somewhat shorter than the pistils; sterile interstice 0.2-0.4 cm long, a few to several irregular whorls of truncate centrally impressed more or less circular (from above) staminodes with their filaments connate in groups of 2-4; male zone cylindric 1.2-1.5 cm long; stamens crowded, arranged in precise longitudinally aligned pairs, rectangular, c. 0.8-1 mm across; connective deeply excavated, with the cavity not septate; thecae opposite on the distal and proximal (with respect to the spadix axis) sides of the anther; horns very short, suberect; appendix very shortly cylindric, apically blunt, 0.2-0.7 cm long; staminodes of appendix irregularly polygonal to more or less circular from above, centrally impressed, c. 0.5-0.8 mm diam. Fruiting spathe obconic, c. 1.8 cm long and wide at mouth; berries clustered in a globular to slightly elongate group c. 0.8 cm wide and to 1.2 cm long; berries ellipsoid to cylindric, c. 2 mm diam.; seed subcylindric, c. 2 mm long, 0.5 mm diam., slightly ribbed, with an elongate curved translucent micropylar appendage.
Lithophytic in forest and rheophytic on stream rocks in deep shade, 5-90 m alt.
