Morphological Study of Bog Bulrush (Schoenoplectiella mucronata) from Rokan Hulu, Riau, Indonesia

Bog bulrush ( Schoenoplectiella mucronata ) is an aquatic flowering plant, considered as weeds. The stems can be used as material of mats, sacks, box, rope etc. so that it reduce the plastic use. This study aimed to describe the morphology of this aquatic plant collected from Rokan Hulu, Riau, Indonesia. It is a tufted perennial plant with an upright or horizontal rhizome; the stem reaches a height of 80–90) cm, 4–6 mm wide, has a sharp triangular section, has indistinct serrations. The tip leaf is conical into a sheath, 5–7 cm long, ending at a triangular apex, pale brown in color, absent; midrib, petiole, veins, ligule, and blade. Develops a pseudolateral, dense, head-like cluster of 3-20 spikelets; rod main stem, sharp triangle, 20-25 mm long, sharp tip, and usually upright. Fruit an obovoid nutlet, 1.0–2.5 mm × 1–1.5 mm, bluntly 3-angled, blackish, minutely wrinkled. Sessile grain, ovate to cylindrical, flowering length 4–5 mm, fruit length 310-20 mm, many flowers; the glume is spiral, oval, concave, 3–5 mm long, pale brown; bisexual flowers, perianth consisting of (4–) 6 brown hairs with recessed teeth, 3 stamens, superior and 1-locular ovaries, 2–3 stigmas.