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Halodule uninervis is a marine, perennial herb that reaches up to 2-4.5 cm with a wiry and erect stems. Leaves are 5-15 x 0.03-0.3 cm, produced in groups of 2-4 on the stems; leaf-sheaths are long, folded, bi-auriculate; while leaf blades are linear to setaceous, straight or somewhat falcate, flat, and dark green with 1 prominent midrib, narrowed base, and an apex with 2 lateral teeth and often 1 median tooth. Flowers are produced solitary beside a young leaf, and surrounded by membranous, somewhat dilated sheaths; male flowers are pedunculate with one anther inserted above the other, while female flowers are with 2 carpels situated collater¬ally on a clavate peduncle which bears 3 small apical protuberances with a laterally inserted style. The fruit is globose, hard, orange, papillate.