||robust reddish rhizome, with only one strongly
branched root (up to 28 centimeters) and a short, erect stem bearing from
2 to 5 leaves at each internode. The leaf-sheath is linear or slightly obconical,
light red and from 3 to 7 centimeters long. The leaf-blade is linear, from
10 to 30 centimeters long and from 2 to 4 millimeters wide, sometimes slightly
tapering towards the apex. The leaf-tip is rounded; the margin is entire
and, near the leaf-tip, is more or less spinulose; 7-9 nerves, between each
pair of nerves there are 2-3 thin nerves; the midrib is often projecting.
Male flowers have 7-10 centimeters stalks; anthers end in a small yellow,
red (tannin) spotted, 11-15 millimeters long protuberance. Female flowers
are sessile; the ovary is ovoid and 3 millimeters long; the style is 2-3
millimeters long, the stigmata are 22-25 millimeters long. The fruit is
sessile, 8 millimeters long, slightly flat. It is a perennial plant.