Araceae
Lasia concinna Alderw.
SUMMARY
Massive rhizomatous herb; rhizome condensed, orthotropic, decumbent, c. 13 cm diameter; stolons wanting. Leaves to c. 1.6 m long; sheath short, papery, brown, about a quarter of the length of the petiole; petioles diverging from near the base, mottled white, green, and olive, very spiny with the small spines mostly arranged in oblique, somewhat undulating combs; lamina hastate-sagittate, divided to the third or fourth degree, somewhat coriaceous, dark green, unarmed, c. 60 cm long; peduncle similar to but somewhat exceeding the petioles. Spathe erect, narrowly ovate, to c. 30 cm long, very thick and coriaceous, convolute below, constricted at the lower third above the level of the spadix apex, the upper part slightly twisted and gaping, in the lower part bright green with vertical yellow stripes, in the upper part pale brown outside, marcescent; spadix sessile, to c. 7.5 cm long, ± cylindrical, yellow. Flowers hexamerous; fruiting spadix c. 18 cm long, 6 cm diameter. Fruits ovoid, obtuse at the apex, smooth. Seed more or less pyramidal, c. 1.5 cm long, filling the locule, on apical placenta; seed-coat thin, brown, spinulous.