丛生大叶藻 cong sheng da ye zao

Rhizomes slightly erect, with very short internodes. Leaves on non-flowering shoots 3 or 4, linear, ca. 60 cm × 3-6 mm, 5-7-veined, margin entire or sometimes minutely denticulate, apex retuse; sheaths closed, tubular, slightly leathery, persistent, splitting irregularly when old; auricle ca. 1 mm; ligule ca. 0.5 mm; intravaginal squamules 2, linear. Flowering stems 30-60 cm, branched; spathes with flattened stalk, narrower than leaves; spadix without projections. Anthers 4-5 mm. Ovary ca. 2.5 mm; style ca. 2 mm; stigmas subulate, ca. 2 mm. Fruit ellipsoid, ca. 3.5 mm. Seeds with 16-20 longitudinal ribs. Fl. and fr. Apr-Jun. 2n = 12.

Bottoms of shallow seas. Coast of Liaoning (Dalian) [coasts of Japan and Korea].