Najas browniana Rendle

Up to 15 cm, lower internodes 1-3(-6) cm by 0.5-0.8(-0.9) mm. Leaves 1.5-2.25 cm by (0.35-)0.4-0.7(-0.8) mm, flat, sometimes slightly fleshy, apex obtuse to rounded, sometimes acute (c. 3 mm below the tip 0.25-0.6 mm wide); margin on either side with 12-21 spiny teeth largely in the upper portion of the blade; no spines on the dorsal surface; spine-cells < 0.05-0.15 mm, (dark) brown; teeth up to as long as 0.2 of the width of the blade; midrib c. 0.07 as wide as the blade; cavities occupying ¼-¾ of the width of the blade, septa often indistinct. Sheath on either side with (1-)3—7(-10) spines, no (?) spines on the inner edge of the auricle, (1.5-)2(-2.3) by 1.5-2.9 mm; auricles mostly broad, seldom long-triangular, truncate-rounded to acute, sometimes acuminate, rarely falcate, (0.1-)0.2-0.3(-0.5) by 0.25-0.75 mm, entire to lobed or lacerate (incisions up to halfway (or more) the auricle). Flowers mostly up to 3 together, in different stages, together with one male1 or the male solitary. Male flowers: spathe 1.3-2 mm, neck almost cylindrical, 0.3-0.5 mm, the tip almost truncate, entire to lacerate; anther 1-celled, ovate to oblong(-lanceolate), 0.6-0.8 (-0.9) by 0.2-0.3 mm; 'perianth lobes' indistinct; 'pedicel' 0.3-0.6 mm, at anthesis 1-1.5 mm. Female flowers: spathe absent; female flowers 1.5-2 mm; ovary 0.5-0.8 by 0.2-0.3 mm; style (0.2-)0.5-0.7 mm, with 2 stigmas (0.3-)0.5-0.7(-0.9) mm. Seeds (1.5-and narrow) 1.6-2 by (0.45-)0.5-0.7(-0.75) mm, testa with 18-30 length-rows of 27-37 subquadrate or 5-6-angular areoles.

In the Kuwu saline mudwell area the only aquatic water plant, near Surabaja in brackish water of fish ponds, in Madura in pools near the sea, in S. New Guinea in open Eleocharis swamp, all localities as far as known saline and at very low altitude.